yang/yang-model-export/src/main/java/org/opendaylight/yangtools/yang/model/export/SchemaContextEmitter.java

   1 /*
   2  * Copyright (c) 2015 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.yangtools.yang.model.export;
   9
  10 import com.google.common.annotations.Beta;
  11 import com.google.common.base.Preconditions;
  12 import com.google.common.base.Predicates;
  13 import com.google.common.base.Strings;
  14 import com.google.common.collect.Collections2;
  15 import com.google.common.collect.Range;
  16 import com.google.common.collect.RangeSet;
  17 import com.google.common.primitives.UnsignedInteger;
  18 import java.net.URI;
  19 import java.util.Collection;
  20 import java.util.Date;
  21 import java.util.Iterator;
  22 import java.util.List;
  23 import java.util.Map;
  24 import java.util.Map.Entry;
  25 import java.util.Objects;
  26 import java.util.Optional;
  27 import java.util.Set;
  28 import javax.annotation.Nonnull;
  29 import javax.annotation.Nullable;
  30 import javax.annotation.concurrent.NotThreadSafe;
  31 import org.opendaylight.yangtools.yang.common.QName;
  32 import org.opendaylight.yangtools.yang.common.YangVersion;
  33 import org.opendaylight.yangtools.yang.model.api.ActionDefinition;
  34 import org.opendaylight.yangtools.yang.model.api.AnyDataSchemaNode;
  35 import org.opendaylight.yangtools.yang.model.api.AnyXmlSchemaNode;
  36 import org.opendaylight.yangtools.yang.model.api.AugmentationSchema;
  37 import org.opendaylight.yangtools.yang.model.api.ChoiceCaseNode;
  38 import org.opendaylight.yangtools.yang.model.api.ChoiceSchemaNode;
  39 import org.opendaylight.yangtools.yang.model.api.ConstraintDefinition;
  40 import org.opendaylight.yangtools.yang.model.api.ContainerSchemaNode;
  41 import org.opendaylight.yangtools.yang.model.api.DataNodeContainer;
  42 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
  43 import org.opendaylight.yangtools.yang.model.api.Deviation;
  44 import org.opendaylight.yangtools.yang.model.api.DocumentedNode;
  45 import org.opendaylight.yangtools.yang.model.api.ExtensionDefinition;
  46 import org.opendaylight.yangtools.yang.model.api.FeatureDefinition;
  47 import org.opendaylight.yangtools.yang.model.api.GroupingDefinition;
  48 import org.opendaylight.yangtools.yang.model.api.IdentitySchemaNode;
  49 import org.opendaylight.yangtools.yang.model.api.LeafListSchemaNode;
  50 import org.opendaylight.yangtools.yang.model.api.LeafSchemaNode;
  51 import org.opendaylight.yangtools.yang.model.api.ListSchemaNode;
  52 import org.opendaylight.yangtools.yang.model.api.Module;
  53 import org.opendaylight.yangtools.yang.model.api.ModuleImport;
  54 import org.opendaylight.yangtools.yang.model.api.MustDefinition;
  55 import org.opendaylight.yangtools.yang.model.api.NotificationDefinition;
  56 import org.opendaylight.yangtools.yang.model.api.OperationDefinition;
  57 import org.opendaylight.yangtools.yang.model.api.RevisionAwareXPath;
  58 import org.opendaylight.yangtools.yang.model.api.RpcDefinition;
  59 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  60 import org.opendaylight.yangtools.yang.model.api.SchemaNode;
  61 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
  62 import org.opendaylight.yangtools.yang.model.api.Status;
  63 import org.opendaylight.yangtools.yang.model.api.TypeDefinition;
  64 import org.opendaylight.yangtools.yang.model.api.UniqueConstraint;
  65 import org.opendaylight.yangtools.yang.model.api.UnknownSchemaNode;
  66 import org.opendaylight.yangtools.yang.model.api.UsesNode;
  67 import org.opendaylight.yangtools.yang.model.api.meta.DeclaredStatement;
  68 import org.opendaylight.yangtools.yang.model.api.meta.EffectiveStatement;
  69 import org.opendaylight.yangtools.yang.model.api.meta.StatementDefinition;
  70 import org.opendaylight.yangtools.yang.model.api.meta.StatementSource;
  71 import org.opendaylight.yangtools.yang.model.api.stmt.ActionStatement;
  72 import org.opendaylight.yangtools.yang.model.api.stmt.AnydataStatement;
  73 import org.opendaylight.yangtools.yang.model.api.stmt.AnyxmlStatement;
  74 import org.opendaylight.yangtools.yang.model.api.stmt.ArgumentStatement;
  75 import org.opendaylight.yangtools.yang.model.api.stmt.AugmentStatement;
  76 import org.opendaylight.yangtools.yang.model.api.stmt.BaseStatement;
  77 import org.opendaylight.yangtools.yang.model.api.stmt.BelongsToStatement;
  78 import org.opendaylight.yangtools.yang.model.api.stmt.BitStatement;
  79 import org.opendaylight.yangtools.yang.model.api.stmt.BodyGroup;
  80 import org.opendaylight.yangtools.yang.model.api.stmt.CaseStatement;
  81 import org.opendaylight.yangtools.yang.model.api.stmt.ChoiceStatement;
  82 import org.opendaylight.yangtools.yang.model.api.stmt.ConfigStatement;
  83 import org.opendaylight.yangtools.yang.model.api.stmt.ContactStatement;
  84 import org.opendaylight.yangtools.yang.model.api.stmt.ContainerStatement;
  85 import org.opendaylight.yangtools.yang.model.api.stmt.DataDefinitionContainer;
  86 import org.opendaylight.yangtools.yang.model.api.stmt.DataDefinitionStatement;
  87 import org.opendaylight.yangtools.yang.model.api.stmt.DefaultStatement;
  88 import org.opendaylight.yangtools.yang.model.api.stmt.DescriptionStatement;
  89 import org.opendaylight.yangtools.yang.model.api.stmt.DeviateStatement;
  90 import org.opendaylight.yangtools.yang.model.api.stmt.DeviationStatement;
  91 import org.opendaylight.yangtools.yang.model.api.stmt.DocumentationGroup;
  92 import org.opendaylight.yangtools.yang.model.api.stmt.DocumentedConstraintGroup;
  93 import org.opendaylight.yangtools.yang.model.api.stmt.EnumStatement;
  94 import org.opendaylight.yangtools.yang.model.api.stmt.ErrorAppTagStatement;
  95 import org.opendaylight.yangtools.yang.model.api.stmt.ErrorMessageStatement;
  96 import org.opendaylight.yangtools.yang.model.api.stmt.FeatureStatement;
  97 import org.opendaylight.yangtools.yang.model.api.stmt.FractionDigitsStatement;
  98 import org.opendaylight.yangtools.yang.model.api.stmt.GroupingStatement;
  99 import org.opendaylight.yangtools.yang.model.api.stmt.IdentityStatement;
 100 import org.opendaylight.yangtools.yang.model.api.stmt.IfFeatureStatement;
 101 import org.opendaylight.yangtools.yang.model.api.stmt.ImportStatement;
 102 import org.opendaylight.yangtools.yang.model.api.stmt.IncludeStatement;
 103 import org.opendaylight.yangtools.yang.model.api.stmt.InputStatement;
 104 import org.opendaylight.yangtools.yang.model.api.stmt.KeyStatement;
 105 import org.opendaylight.yangtools.yang.model.api.stmt.LeafListStatement;
 106 import org.opendaylight.yangtools.yang.model.api.stmt.LeafStatement;
 107 import org.opendaylight.yangtools.yang.model.api.stmt.LengthStatement;
 108 import org.opendaylight.yangtools.yang.model.api.stmt.LinkageGroup;
 109 import org.opendaylight.yangtools.yang.model.api.stmt.ListStatement;
 110 import org.opendaylight.yangtools.yang.model.api.stmt.MandatoryStatement;
 111 import org.opendaylight.yangtools.yang.model.api.stmt.MaxElementsStatement;
 112 import org.opendaylight.yangtools.yang.model.api.stmt.MetaGroup;
 113 import org.opendaylight.yangtools.yang.model.api.stmt.MinElementsStatement;
 114 import org.opendaylight.yangtools.yang.model.api.stmt.ModifierStatement;
 115 import org.opendaylight.yangtools.yang.model.api.stmt.ModuleStatement;
 116 import org.opendaylight.yangtools.yang.model.api.stmt.MustStatement;
 117 import org.opendaylight.yangtools.yang.model.api.stmt.NamespaceStatement;
 118 import org.opendaylight.yangtools.yang.model.api.stmt.NotificationStatement;
 119 import org.opendaylight.yangtools.yang.model.api.stmt.OperationGroup;
 120 import org.opendaylight.yangtools.yang.model.api.stmt.OrderedByStatement;
 121 import org.opendaylight.yangtools.yang.model.api.stmt.OrganizationStatement;
 122 import org.opendaylight.yangtools.yang.model.api.stmt.OutputStatement;
 123 import org.opendaylight.yangtools.yang.model.api.stmt.PathStatement;
 124 import org.opendaylight.yangtools.yang.model.api.stmt.PatternStatement;
 125 import org.opendaylight.yangtools.yang.model.api.stmt.PositionStatement;
 126 import org.opendaylight.yangtools.yang.model.api.stmt.PrefixStatement;
 127 import org.opendaylight.yangtools.yang.model.api.stmt.PresenceStatement;
 128 import org.opendaylight.yangtools.yang.model.api.stmt.RangeStatement;
 129 import org.opendaylight.yangtools.yang.model.api.stmt.ReferenceStatement;
 130 import org.opendaylight.yangtools.yang.model.api.stmt.RefineStatement;
 131 import org.opendaylight.yangtools.yang.model.api.stmt.RequireInstanceStatement;
 132 import org.opendaylight.yangtools.yang.model.api.stmt.RevisionDateStatement;
 133 import org.opendaylight.yangtools.yang.model.api.stmt.RevisionGroup;
 134 import org.opendaylight.yangtools.yang.model.api.stmt.RevisionStatement;
 135 import org.opendaylight.yangtools.yang.model.api.stmt.RpcStatement;
 136 import org.opendaylight.yangtools.yang.model.api.stmt.StatusStatement;
 137 import org.opendaylight.yangtools.yang.model.api.stmt.SubmoduleStatement;
 138 import org.opendaylight.yangtools.yang.model.api.stmt.TypeStatement;
 139 import org.opendaylight.yangtools.yang.model.api.stmt.TypedefStatement;
 140 import org.opendaylight.yangtools.yang.model.api.stmt.UniqueStatement;
 141 import org.opendaylight.yangtools.yang.model.api.stmt.UnitsStatement;
 142 import org.opendaylight.yangtools.yang.model.api.stmt.UnknownStatement;
 143 import org.opendaylight.yangtools.yang.model.api.stmt.UsesStatement;
 144 import org.opendaylight.yangtools.yang.model.api.stmt.ValueStatement;
 145 import org.opendaylight.yangtools.yang.model.api.stmt.WhenStatement;
 146 import org.opendaylight.yangtools.yang.model.api.stmt.YangVersionStatement;
 147 import org.opendaylight.yangtools.yang.model.api.stmt.YinElementStatement;
 148 import org.opendaylight.yangtools.yang.model.api.type.BinaryTypeDefinition;
 149 import org.opendaylight.yangtools.yang.model.api.type.BitsTypeDefinition;
 150 import org.opendaylight.yangtools.yang.model.api.type.BitsTypeDefinition.Bit;
 151 import org.opendaylight.yangtools.yang.model.api.type.BooleanTypeDefinition;
 152 import org.opendaylight.yangtools.yang.model.api.type.DecimalTypeDefinition;
 153 import org.opendaylight.yangtools.yang.model.api.type.EmptyTypeDefinition;
 154 import org.opendaylight.yangtools.yang.model.api.type.EnumTypeDefinition;
 155 import org.opendaylight.yangtools.yang.model.api.type.EnumTypeDefinition.EnumPair;
 156 import org.opendaylight.yangtools.yang.model.api.type.IdentityrefTypeDefinition;
 157 import org.opendaylight.yangtools.yang.model.api.type.InstanceIdentifierTypeDefinition;
 158 import org.opendaylight.yangtools.yang.model.api.type.IntegerTypeDefinition;
 159 import org.opendaylight.yangtools.yang.model.api.type.LeafrefTypeDefinition;
 160 import org.opendaylight.yangtools.yang.model.api.type.LengthConstraint;
 161 import org.opendaylight.yangtools.yang.model.api.type.ModifierKind;
 162 import org.opendaylight.yangtools.yang.model.api.type.PatternConstraint;
 163 import org.opendaylight.yangtools.yang.model.api.type.RangeConstraint;
 164 import org.opendaylight.yangtools.yang.model.api.type.StringTypeDefinition;
 165 import org.opendaylight.yangtools.yang.model.api.type.UnionTypeDefinition;
 166 import org.opendaylight.yangtools.yang.model.api.type.UnsignedIntegerTypeDefinition;
 167 import org.opendaylight.yangtools.yang.model.util.SchemaNodeUtils;
 168
 169 @Beta
 170 @NotThreadSafe
 171 abstract class SchemaContextEmitter {
 172
 173     final YangModuleWriter writer;
 174     final boolean emitInstantiated;
 175     final boolean emitUses;
 176     final Map<QName, StatementDefinition> extensions;
 177     final YangVersion yangVersion;
 178
 179     SchemaContextEmitter(final YangModuleWriter writer, final Map<QName, StatementDefinition> extensions,
 180             final YangVersion yangVersion) {
 181         this(writer, extensions, yangVersion, false, true);
 182     }
 183
 184     SchemaContextEmitter(final YangModuleWriter writer, final Map<QName, StatementDefinition> extensions,
 185             final YangVersion yangVersion, final boolean emitInstantiated, final boolean emitUses) {
 186         this.writer = Preconditions.checkNotNull(writer);
 187         this.emitInstantiated = emitInstantiated;
 188         this.emitUses = emitUses;
 189         this.extensions = Preconditions.checkNotNull(extensions);
 190         this.yangVersion = yangVersion;
 191     }
 192
 193     static void writeToStatementWriter(final Module module, final SchemaContext ctx,
 194             final StatementTextWriter statementWriter, final boolean emitInstantiated) {
 195         final YangModuleWriter yangSchemaWriter = SchemaToStatementWriterAdaptor.from(statementWriter);
 196         final Map<QName, StatementDefinition> extensions = ExtensionStatement.mapFrom(ctx.getExtensions());
 197         if (module instanceof EffectiveStatement && !emitInstantiated) {
 198             /*
 199              * if module is an effective statement and we don't want to export
 200              * instantiated statements (e.g. statements added by uses or
 201              * augment) we can get declared form i.e. ModuleStatement and then
 202              * use DeclaredSchemaContextEmitter
 203              */
 204             new DeclaredSchemaContextEmitter(yangSchemaWriter, extensions, module.getYangVersion())
 205             .emitModule(((EffectiveStatement<?, ?>) module).getDeclared());
 206         } else {
 207             /*
 208              * if we don't have access to declared form of supplied module or we
 209              * want to emit also instantiated statements (e.g. statements added
 210              * by uses or augment), we use EffectiveSchemaContextEmitter.
 211              */
 212             new EffectiveSchemaContextEmitter(yangSchemaWriter, extensions, module.getYangVersion(), emitInstantiated)
 213             .emitModule(module);
 214         }
 215     }
 216
 217     // FIXME: Probably should be moved to utils bundle.
 218     static <T> boolean isPrefix(final Iterable<T> prefix, final Iterable<T> other) {
 219         final Iterator<T> prefixIt = prefix.iterator();
 220         final Iterator<T> otherIt = other.iterator();
 221         while (prefixIt.hasNext()) {
 222             if (!otherIt.hasNext()) {
 223                 return false;
 224             }
 225             if (!Objects.deepEquals(prefixIt.next(), otherIt.next())) {
 226                 return false;
 227             }
 228         }
 229         return true;
 230     }
 231
 232     static class DeclaredSchemaContextEmitter extends SchemaContextEmitter {
 233
 234         DeclaredSchemaContextEmitter(final YangModuleWriter writer, final Map<QName, StatementDefinition> extensions,
 235                 final YangVersion yangVersion) {
 236             super(writer, extensions, yangVersion);
 237         }
 238
 239         void emitModule(final DeclaredStatement<?> declaredRootStmt) {
 240             if (declaredRootStmt instanceof ModuleStatement) {
 241                 emitModule((ModuleStatement) declaredRootStmt);
 242             } else if (declaredRootStmt instanceof SubmoduleStatement) {
 243                 emitSubmodule((SubmoduleStatement) declaredRootStmt);
 244             } else {
 245                 throw new UnsupportedOperationException(
 246                         String.format("Yin export: unsupported declared statement %s", declaredRootStmt));
 247             }
 248         }
 249
 250         private void emitModule(final ModuleStatement module) {
 251             super.writer.startModuleNode(module.rawArgument());
 252             emitModuleHeader(module);
 253             emitLinkageNodes(module);
 254             emitMetaNodes(module);
 255             emitRevisionNodes(module);
 256             emitBodyNodes(module);
 257             emitUnknownStatementNodes(module);
 258             super.writer.endNode();
 259         }
 260
 261         private void emitModuleHeader(final ModuleStatement input) {
 262             emitYangVersionNode(input.getYangVersion());
 263             emitNamespace(input.getNamespace());
 264             emitPrefixNode(input.getPrefix());
 265         }
 266
 267         private void emitSubmodule(final SubmoduleStatement submodule) {
 268             super.writer.startSubmoduleNode(submodule.rawArgument());
 269             emitSubmoduleHeaderNodes(submodule);
 270             emitLinkageNodes(submodule);
 271             emitMetaNodes(submodule);
 272             emitRevisionNodes(submodule);
 273             emitBodyNodes(submodule);
 274             emitUnknownStatementNodes(submodule);
 275             super.writer.endNode();
 276         }
 277
 278         private void emitSubmoduleHeaderNodes(final SubmoduleStatement input) {
 279             emitYangVersionNode(input.getYangVersion());
 280             emitBelongsTo(input.getBelongsTo());
 281         }
 282
 283         private void emitBelongsTo(final BelongsToStatement belongsTo) {
 284             super.writer.startBelongsToNode(belongsTo.rawArgument());
 285             emitPrefixNode(belongsTo.getPrefix());
 286             super.writer.endNode();
 287         }
 288
 289         private void emitMetaNodes(final MetaGroup input) {
 290             emitOrganizationNode(input.getOrganization());
 291             emitContact(input.getContact());
 292             emitDescriptionNode(input.getDescription());
 293             emitReferenceNode(input.getReference());
 294         }
 295
 296         private void emitLinkageNodes(final LinkageGroup input) {
 297             for (final ImportStatement importNode : input.getImports()) {
 298                 emitImport(importNode);
 299             }
 300             for (final IncludeStatement importNode : input.getIncludes()) {
 301                 emitInclude(importNode);
 302             }
 303         }
 304
 305         private void emitRevisionNodes(final RevisionGroup input) {
 306             emitRevisions(input.getRevisions());
 307         }
 308
 309         private void emitBodyNodes(final BodyGroup input) {
 310
 311             for (final org.opendaylight.yangtools.yang.model.api.stmt.ExtensionStatement extension : input
 312                     .getExtensions()) {
 313                 emitExtension(extension);
 314             }
 315             for (final FeatureStatement definition : input.getFeatures()) {
 316                 emitFeature(definition);
 317             }
 318             for (final IdentityStatement identity : input.getIdentities()) {
 319                 emitIdentity(identity);
 320             }
 321             for (final DeviationStatement deviation : input.getDeviations()) {
 322                 emitDeviation(deviation);
 323             }
 324
 325             emitDataNodeContainer(input);
 326
 327             for (final AugmentStatement augmentation : input.getAugments()) {
 328                 emitAugment(augmentation);
 329             }
 330             for (final RpcStatement rpc : input.getRpcs()) {
 331                 emitRpc(rpc);
 332             }
 333
 334             emitNotifications(input.getNotifications());
 335         }
 336
 337         private void emitDataNodeContainer(final DataDefinitionContainer input) {
 338             for (final DataDefinitionStatement child : input.getDataDefinitions()) {
 339                 emitDataSchemaNode(child);
 340             }
 341         }
 342
 343         private void emitDataNodeContainer(final DataDefinitionContainer.WithReusableDefinitions input) {
 344             for (final TypedefStatement typedef : input.getTypedefs()) {
 345                 emitTypedefNode(typedef);
 346             }
 347             for (final GroupingStatement grouping : input.getGroupings()) {
 348                 emitGrouping(grouping);
 349             }
 350             for (final DataDefinitionStatement child : input.getDataDefinitions()) {
 351                 emitDataSchemaNode(child);
 352             }
 353         }
 354
 355         private void emitDataSchemaNode(final DataDefinitionStatement child) {
 356             if (child instanceof ContainerStatement) {
 357                 emitContainer((ContainerStatement) child);
 358             } else if (child instanceof LeafStatement) {
 359                 emitLeaf((LeafStatement) child);
 360             } else if (child instanceof LeafListStatement) {
 361                 emitLeafList((LeafListStatement) child);
 362             } else if (child instanceof ListStatement) {
 363                 emitList((ListStatement) child);
 364             } else if (child instanceof ChoiceStatement) {
 365                 emitChoice((ChoiceStatement) child);
 366             } else if (child instanceof AnyxmlStatement) {
 367                 emitAnyxml((AnyxmlStatement) child);
 368             } else if (child instanceof AnydataStatement) {
 369                 emitAnydata((AnydataStatement) child);
 370             } else if (child instanceof UsesStatement) {
 371                 emitUsesNode((UsesStatement) child);
 372             } else {
 373                 throw new UnsupportedOperationException("Not supported DataStatement type " + child.getClass());
 374             }
 375         }
 376
 377         private void emitYangVersionNode(@Nullable final YangVersionStatement yangVersionStatement) {
 378             if (yangVersionStatement != null) {
 379                 super.writer.startYangVersionNode(yangVersionStatement.rawArgument());
 380                 super.writer.endNode();
 381             }
 382         }
 383
 384         private void emitImport(final ImportStatement importNode) {
 385             super.writer.startImportNode(importNode.rawArgument());
 386             emitDocumentedNode(importNode);
 387             emitPrefixNode(importNode.getPrefix());
 388             emitRevisionDateNode(importNode.getRevisionDate());
 389             super.writer.endNode();
 390         }
 391
 392         private void emitInclude(final IncludeStatement include) {
 393             super.writer.startIncludeNode(include.rawArgument());
 394             emitDocumentedNode(include);
 395             emitRevisionDateNode(include.getRevisionDate());
 396             super.writer.endNode();
 397         }
 398
 399         private void emitNamespace(final NamespaceStatement namespaceStatement) {
 400             Preconditions.checkNotNull(namespaceStatement, "Namespace must not be null");
 401             super.writer.startNamespaceNode(namespaceStatement.getUri());
 402             super.writer.endNode();
 403         }
 404
 405         private void emitPrefixNode(final PrefixStatement prefixStatement) {
 406             Preconditions.checkNotNull(prefixStatement, "Prefix must not be null");
 407             super.writer.startPrefixNode(prefixStatement.rawArgument());
 408             super.writer.endNode();
 409         }
 410
 411         private void emitOrganizationNode(@Nullable final OrganizationStatement organizationStatement) {
 412             if (organizationStatement != null) {
 413                 super.writer.startOrganizationNode(organizationStatement.rawArgument());
 414                 super.writer.endNode();
 415             }
 416         }
 417
 418         private void emitContact(@Nullable final ContactStatement contactStatement) {
 419             if (contactStatement != null) {
 420                 super.writer.startContactNode(contactStatement.rawArgument());
 421                 super.writer.endNode();
 422             }
 423         }
 424
 425         private void emitDescriptionNode(@Nullable final DescriptionStatement descriptionStatement) {
 426             if (descriptionStatement != null) {
 427                 super.writer.startDescriptionNode(descriptionStatement.rawArgument());
 428                 super.writer.endNode();
 429             }
 430         }
 431
 432         private void emitReferenceNode(@Nullable final ReferenceStatement referenceStatement) {
 433             if (referenceStatement != null) {
 434                 super.writer.startReferenceNode(referenceStatement.rawArgument());
 435                 super.writer.endNode();
 436             }
 437         }
 438
 439         private void emitUnitsNode(@Nullable final UnitsStatement unitsStatement) {
 440             if (unitsStatement != null) {
 441                 super.writer.startUnitsNode(unitsStatement.rawArgument());
 442                 super.writer.endNode();
 443             }
 444         }
 445
 446         private void emitRevisions(final Collection<? extends RevisionStatement> revisions) {
 447             for (final RevisionStatement revisionStatement : revisions) {
 448                 emitRevision(revisionStatement);
 449             }
 450         }
 451
 452         private void emitRevision(final RevisionStatement revision) {
 453             super.writer.startRevisionNode(revision.rawArgument());
 454             emitDocumentedNode(revision);
 455             super.writer.endNode();
 456         }
 457
 458         private void emitRevisionDateNode(@Nullable final RevisionDateStatement revisionDateStatement) {
 459             if (revisionDateStatement != null) {
 460                 super.writer.startRevisionDateNode(revisionDateStatement.rawArgument());
 461                 super.writer.endNode();
 462             }
 463         }
 464
 465         private void emitExtension(final org.opendaylight.yangtools.yang.model.api.stmt.ExtensionStatement extension) {
 466             super.writer.startExtensionNode(extension.rawArgument());
 467             emitArgument(extension.getArgument());
 468             emitDocumentedNodeWithStatus(extension);
 469             emitUnknownStatementNodes(extension);
 470             super.writer.endNode();
 471         }
 472
 473         private void emitArgument(@Nullable final ArgumentStatement input) {
 474             if (input != null) {
 475                 super.writer.startArgumentNode(input.rawArgument());
 476                 emitYinElement(input.getYinElement());
 477                 super.writer.endNode();
 478             }
 479         }
 480
 481         private void emitYinElement(@Nullable final YinElementStatement yinElementStatement) {
 482             if (yinElementStatement != null) {
 483                 super.writer.startYinElementNode(yinElementStatement.rawArgument());
 484                 super.writer.endNode();
 485             }
 486         }
 487
 488         private void emitIdentity(final IdentityStatement identity) {
 489             super.writer.startIdentityNode(identity.rawArgument());
 490             emitBaseIdentities(identity.getBases());
 491             emitStatusNode(identity.getStatus());
 492             emitDescriptionNode(identity.getDescription());
 493             emitReferenceNode(identity.getReference());
 494             super.writer.endNode();
 495         }
 496
 497         private void emitBaseIdentities(final Collection<? extends BaseStatement> collection) {
 498             for (final BaseStatement baseStmt : collection) {
 499                 emitBase(baseStmt);
 500             }
 501         }
 502
 503         private void emitBase(final BaseStatement baseStmt) {
 504             super.writer.startBaseNode(baseStmt.rawArgument());
 505             super.writer.endNode();
 506         }
 507
 508         private void emitFeature(final FeatureStatement feature) {
 509             super.writer.startFeatureNode(feature.rawArgument());
 510             emitIfFeatures(feature.getIfFeatures());
 511             emitDocumentedNodeWithStatus(feature);
 512             super.writer.endNode();
 513         }
 514
 515         private void emitIfFeatures(final Collection<? extends IfFeatureStatement> ifFeatures) {
 516             for (final IfFeatureStatement ifFeatureStatement : ifFeatures) {
 517                 emitIfFeature(ifFeatureStatement);
 518             }
 519         }
 520
 521         private void emitIfFeature(final IfFeatureStatement ifFeature) {
 522             super.writer.startIfFeatureNode(ifFeature.rawArgument());
 523             super.writer.endNode();
 524         }
 525
 526         private void emitTypedefNode(final TypedefStatement typedef) {
 527             super.writer.startTypedefNode(typedef.rawArgument());
 528             emitType(typedef.getType());
 529             emitUnitsNode(typedef.getUnits());
 530             emitDefaultNode(typedef.getDefault());
 531             emitStatusNode(typedef.getStatus());
 532             emitDescriptionNode(typedef.getDescription());
 533             emitReferenceNode(typedef.getReference());
 534             emitUnknownStatementNodes(typedef);
 535             super.writer.endNode();
 536         }
 537
 538         private void emitType(final TypeStatement typeStatement) {
 539             super.writer.startTypeNode(typeStatement.rawArgument());
 540             for (final DeclaredStatement<?> typeSubstmt : typeStatement.declaredSubstatements()) {
 541                 if (typeSubstmt instanceof RangeStatement) {
 542                     emitRange((RangeStatement) typeSubstmt);
 543                 } else if (typeSubstmt instanceof LengthStatement) {
 544                     emitLength((LengthStatement) typeSubstmt);
 545                 } else if (typeSubstmt instanceof PatternStatement) {
 546                     emitPattern((PatternStatement) typeSubstmt);
 547                 } else if (typeSubstmt instanceof FractionDigitsStatement) {
 548                     emitFractionDigits((FractionDigitsStatement) typeSubstmt);
 549                 } else if (typeSubstmt instanceof EnumStatement) {
 550                     emitEnum((EnumStatement) typeSubstmt);
 551                 } else if (typeSubstmt instanceof PathStatement) {
 552                     emitPath((PathStatement) typeSubstmt);
 553                 } else if (typeSubstmt instanceof RequireInstanceStatement) {
 554                     emitRequireInstance((RequireInstanceStatement) typeSubstmt);
 555                 } else if (typeSubstmt instanceof BaseStatement) {
 556                     emitBase((BaseStatement) typeSubstmt);
 557                 } else if (typeSubstmt instanceof BitStatement) {
 558                     emitBit((BitStatement) typeSubstmt);
 559                 } else if (typeSubstmt instanceof TypeStatement) {
 560                     emitType((TypeStatement) typeSubstmt);
 561                 }
 562             }
 563             super.writer.endNode();
 564         }
 565
 566         private void emitRange(final RangeStatement range) {
 567             super.writer.startRangeNode(range.rawArgument());
 568             emitDocumentedConstraint(range);
 569             super.writer.endNode();
 570         }
 571
 572         private void emitFractionDigits(final FractionDigitsStatement fractionDigits) {
 573             super.writer.startFractionDigitsNode(fractionDigits.rawArgument());
 574             super.writer.endNode();
 575         }
 576
 577         private void emitLength(final LengthStatement lengthStatement) {
 578             super.writer.startLengthNode(lengthStatement.rawArgument());
 579             emitDocumentedConstraint(lengthStatement);
 580             super.writer.endNode();
 581         }
 582
 583         private void emitPattern(final PatternStatement pattern) {
 584             super.writer.startPatternNode(pattern.rawArgument());
 585             emitModifier(pattern.getModifierStatement());
 586             emitDocumentedConstraint(pattern);
 587             super.writer.endNode();
 588         }
 589
 590         private void emitModifier(final ModifierStatement modifierStatement) {
 591             if (modifierStatement != null) {
 592                 super.writer.startModifierNode(modifierStatement.rawArgument());
 593                 super.writer.endNode();
 594             }
 595         }
 596
 597         private void emitDefaultNodes(final Collection<? extends DefaultStatement> collection) {
 598             for (final DefaultStatement defaultValue : collection) {
 599                 emitDefaultNode(defaultValue);
 600             }
 601         }
 602
 603         private void emitDefaultNode(@Nullable final DefaultStatement defaultStmt) {
 604             if (defaultStmt != null) {
 605                 super.writer.startDefaultNode(defaultStmt.rawArgument());
 606                 super.writer.endNode();
 607             }
 608         }
 609
 610         private void emitEnum(final EnumStatement enumStmt) {
 611             super.writer.startEnumNode(enumStmt.rawArgument());
 612             emitDocumentedNodeWithStatus(enumStmt);
 613             emitValueNode(enumStmt.getValue());
 614             super.writer.endNode();
 615         }
 616
 617         private void emitPath(final PathStatement path) {
 618             super.writer.startPathNode(path.rawArgument());
 619             super.writer.endNode();
 620         }
 621
 622         private void emitRequireInstance(final RequireInstanceStatement require) {
 623             super.writer.startRequireInstanceNode(require.rawArgument());
 624             super.writer.endNode();
 625         }
 626
 627         private void emitBit(final BitStatement bit) {
 628             super.writer.startBitNode(bit.rawArgument());
 629             emitPositionNode(bit.getPosition());
 630             emitDocumentedNodeWithStatus(bit);
 631             super.writer.endNode();
 632         }
 633
 634         private void emitPositionNode(@Nullable final PositionStatement positionStatement) {
 635             if (positionStatement != null) {
 636                 super.writer.startPositionNode(positionStatement.rawArgument());
 637                 super.writer.endNode();
 638             }
 639         }
 640
 641         private void emitStatusNode(@Nullable final StatusStatement statusStatement) {
 642             if (statusStatement != null) {
 643                 super.writer.startStatusNode(statusStatement.rawArgument());
 644                 super.writer.endNode();
 645             }
 646         }
 647
 648         private void emitConfigNode(@Nullable final ConfigStatement configStatement) {
 649             if (configStatement != null) {
 650                 super.writer.startConfigNode(configStatement.rawArgument());
 651                 super.writer.endNode();
 652             }
 653         }
 654
 655         private void emitMandatoryNode(@Nullable final MandatoryStatement mandatoryStatement) {
 656             if (mandatoryStatement != null) {
 657                 super.writer.startMandatoryNode(mandatoryStatement.rawArgument());
 658                 super.writer.endNode();
 659             }
 660         }
 661
 662         private void emitPresenceNode(@Nullable final PresenceStatement presenceStatement) {
 663             if (presenceStatement != null) {
 664                 super.writer.startPresenceNode(presenceStatement.rawArgument());
 665                 super.writer.endNode();
 666             }
 667         }
 668
 669         private void emitOrderedBy(@Nullable final OrderedByStatement orderedByStatement) {
 670             if (orderedByStatement != null) {
 671                 super.writer.startOrderedByNode(orderedByStatement.rawArgument());
 672                 super.writer.endNode();
 673             }
 674         }
 675
 676         private void emitMust(@Nullable final MustStatement must) {
 677             if (must != null) {
 678                 super.writer.startMustNode(must.rawArgument());
 679                 emitErrorMessageNode(must.getErrorMessageStatement());
 680                 emitErrorAppTagNode(must.getErrorAppTagStatement());
 681                 emitDescriptionNode(must.getDescription());
 682                 emitReferenceNode(must.getReference());
 683                 super.writer.endNode();
 684             }
 685         }
 686
 687         private void emitErrorMessageNode(@Nullable final ErrorMessageStatement errorMessageStatement) {
 688             if (errorMessageStatement != null) {
 689                 super.writer.startErrorMessageNode(errorMessageStatement.rawArgument());
 690                 super.writer.endNode();
 691             }
 692         }
 693
 694         private void emitErrorAppTagNode(@Nullable final ErrorAppTagStatement errorAppTagStatement) {
 695             if (errorAppTagStatement != null) {
 696                 super.writer.startErrorAppTagNode(errorAppTagStatement.rawArgument());
 697                 super.writer.endNode();
 698             }
 699         }
 700
 701         private void emitMinElementsNode(@Nullable final MinElementsStatement minElementsStatement) {
 702             if (minElementsStatement != null) {
 703                 super.writer.startMinElementsNode(minElementsStatement.rawArgument());
 704                 super.writer.endNode();
 705             }
 706         }
 707
 708         private void emitMaxElementsNode(@Nullable final MaxElementsStatement maxElementsStatement) {
 709             if (maxElementsStatement != null) {
 710                 super.writer.startMaxElementsNode(maxElementsStatement.rawArgument());
 711                 super.writer.endNode();
 712             }
 713         }
 714
 715         private void emitValueNode(@Nullable final ValueStatement valueStatement) {
 716             if (valueStatement != null) {
 717                 super.writer.startValueNode(valueStatement.rawArgument());
 718                 super.writer.endNode();
 719             }
 720         }
 721
 722         private void emitDocumentedNodeWithStatus(final DocumentationGroup.WithStatus input) {
 723             emitStatusNode(input.getStatus());
 724             emitDocumentedNode(input);
 725         }
 726
 727         private void emitDocumentedNode(final DocumentationGroup input) {
 728             emitDescriptionNode(input.getDescription());
 729             emitReferenceNode(input.getReference());
 730         }
 731
 732         private void emitDocumentedConstraint(final DocumentedConstraintGroup input) {
 733             emitDescriptionNode(input.getDescription());
 734             emitReferenceNode(input.getReference());
 735             emitErrorMessageNode(input.getErrorMessageStatement());
 736             emitErrorAppTagNode(input.getErrorAppTagStatement());
 737         }
 738
 739         private void emitGrouping(final GroupingStatement grouping) {
 740             super.writer.startGroupingNode(grouping.rawArgument());
 741             emitDocumentedNodeWithStatus(grouping);
 742             emitDataNodeContainer(grouping);
 743             emitUnknownStatementNodes(grouping);
 744             emitNotifications(grouping.getNotifications());
 745             emitActions(grouping.getActions());
 746             super.writer.endNode();
 747
 748         }
 749
 750         private void emitContainer(final ContainerStatement container) {
 751             super.writer.startContainerNode(container.rawArgument());
 752             emitWhen(container.getWhenStatement());
 753             emitMustNodes(container.getMusts());
 754             emitIfFeatures(container.getIfFeatures());
 755             emitPresenceNode(container.getPresence());
 756             emitConfigNode(container.getConfig());
 757             emitDocumentedNodeWithStatus(container);
 758             emitDataNodeContainer(container);
 759             emitUnknownStatementNodes(container);
 760             emitNotifications(container.getNotifications());
 761             emitActions(container.getActions());
 762             super.writer.endNode();
 763
 764         }
 765
 766         private void emitLeaf(final LeafStatement leaf) {
 767             super.writer.startLeafNode(leaf.rawArgument());
 768             emitWhen(leaf.getWhenStatement());
 769             emitIfFeatures(leaf.getIfFeatures());
 770             emitType(leaf.getType());
 771             emitUnitsNode(leaf.getUnits());
 772             emitMustNodes(leaf.getMusts());
 773             emitDefaultNode(leaf.getDefault());
 774             emitConfigNode(leaf.getConfig());
 775             emitMandatoryNode(leaf.getMandatory());
 776             emitDocumentedNodeWithStatus(leaf);
 777             emitUnknownStatementNodes(leaf);
 778             super.writer.endNode();
 779         }
 780
 781         private void emitLeafList(final LeafListStatement leafList) {
 782             super.writer.startLeafListNode(leafList.rawArgument());
 783             emitWhen(leafList.getWhenStatement());
 784             emitIfFeatures(leafList.getIfFeatures());
 785             emitType(leafList.getType());
 786             emitUnitsNode(leafList.getUnits());
 787             emitMustNodes(leafList.getMusts());
 788             emitConfigNode(leafList.getConfig());
 789             emitDefaultNodes(leafList.getDefaults());
 790             emitMinElementsNode(leafList.getMinElements());
 791             emitMaxElementsNode(leafList.getMaxElements());
 792             emitOrderedBy(leafList.getOrderedBy());
 793             emitDocumentedNodeWithStatus(leafList);
 794             emitUnknownStatementNodes(leafList);
 795             super.writer.endNode();
 796         }
 797
 798         private void emitList(final ListStatement list) {
 799             super.writer.startListNode(list.rawArgument());
 800             emitWhen(list.getWhenStatement());
 801             emitIfFeatures(list.getIfFeatures());
 802             emitMustNodes(list.getMusts());
 803             emitKey(list.getKey());
 804             emitUniqueConstraints(list.getUnique());
 805             emitConfigNode(list.getConfig());
 806             emitMinElementsNode(list.getMinElements());
 807             emitMaxElementsNode(list.getMaxElements());
 808             emitOrderedBy(list.getOrderedBy());
 809             emitDocumentedNodeWithStatus(list);
 810             emitDataNodeContainer(list);
 811             emitUnknownStatementNodes(list);
 812             emitNotifications(list.getNotifications());
 813             emitActions(list.getActions());
 814             super.writer.endNode();
 815         }
 816
 817         private void emitMustNodes(final Collection<? extends MustStatement> collection) {
 818             for (final MustStatement must : collection) {
 819                 emitMust(must);
 820             }
 821         }
 822
 823         private void emitKey(final KeyStatement keyStatement) {
 824             if (keyStatement != null) {
 825                 super.writer.startKeyNode(keyStatement.rawArgument());
 826                 super.writer.endNode();
 827             }
 828         }
 829
 830         private void emitUniqueConstraints(final Collection<? extends UniqueStatement> collection) {
 831             for (final UniqueStatement uniqueConstraint : collection) {
 832                 emitUnique(uniqueConstraint);
 833             }
 834         }
 835
 836         private void emitUnique(final UniqueStatement uniqueConstraint) {
 837             if (uniqueConstraint != null) {
 838                 super.writer.startUniqueNode(uniqueConstraint.rawArgument());
 839                 super.writer.endNode();
 840             }
 841         }
 842
 843         private void emitChoice(final ChoiceStatement choice) {
 844             super.writer.startChoiceNode(choice.rawArgument());
 845             emitWhen(choice.getWhenStatement());
 846             emitIfFeatures(choice.getIfFeatures());
 847             emitDefaultNode(choice.getDefault());
 848             emitConfigNode(choice.getConfig());
 849             emitMandatoryNode(choice.getMandatory());
 850             emitDocumentedNodeWithStatus(choice);
 851             emitCases(choice.getCases());
 852             emitUnknownStatementNodes(choice);
 853             super.writer.endNode();
 854         }
 855
 856         private void emitShortCases(final Collection<? extends DeclaredStatement<?>> declaredSubstatements) {
 857             for (final DeclaredStatement<?> child : declaredSubstatements) {
 858                 if (child instanceof ContainerStatement) {
 859                     emitContainer((ContainerStatement) child);
 860                 } else if (child instanceof LeafStatement) {
 861                     emitLeaf((LeafStatement) child);
 862                 } else if (child instanceof LeafListStatement) {
 863                     emitLeafList((LeafListStatement) child);
 864                 } else if (child instanceof ListStatement) {
 865                     emitList((ListStatement) child);
 866                 } else if (child instanceof ChoiceStatement) {
 867                     emitChoice((ChoiceStatement) child);
 868                 } else if (child instanceof AnyxmlStatement) {
 869                     emitAnyxml((AnyxmlStatement) child);
 870                 } else if (child instanceof AnydataStatement) {
 871                     emitAnydata((AnydataStatement) child);
 872                 }
 873             }
 874         }
 875
 876         private void emitCases(final Collection<? extends CaseStatement> cases) {
 877             for (final CaseStatement caze : cases) {
 878                 if (isExplicitStatement(caze)) {
 879                     emitCaseNode(caze);
 880                 } else {
 881                     final Collection<? extends DeclaredStatement<?>> shortCaseChilds = caze.declaredSubstatements();
 882                     Preconditions.checkState(shortCaseChilds.size() == 1,
 883                             "Only one child is allowed for each short case node");
 884                     emitShortCases(shortCaseChilds);
 885                 }
 886             }
 887         }
 888
 889         private void emitCaseNode(final CaseStatement caze) {
 890             super.writer.startCaseNode(caze.rawArgument());
 891             emitWhen(caze.getWhenStatement());
 892             emitIfFeatures(caze.getIfFeatures());
 893             emitDocumentedNodeWithStatus(caze);
 894             emitDataNodeContainer(caze);
 895             emitUnknownStatementNodes(caze);
 896             super.writer.endNode();
 897         }
 898
 899         private void emitAnyxml(final AnyxmlStatement anyxml) {
 900             super.writer.startAnyxmlNode(anyxml.rawArgument());
 901             emitDocumentedNodeWithStatus(anyxml);
 902             emitWhen(anyxml.getWhenStatement());
 903             emitIfFeatures(anyxml.getIfFeatures());
 904             emitMustNodes(anyxml.getMusts());
 905             emitConfigNode(anyxml.getConfig());
 906             emitMandatoryNode(anyxml.getMandatory());
 907             emitDocumentedNodeWithStatus(anyxml);
 908             emitUnknownStatementNodes(anyxml);
 909             super.writer.endNode();
 910         }
 911
 912         private void emitAnydata(final AnydataStatement anydata) {
 913             super.writer.startAnydataNode(anydata.rawArgument());
 914             emitWhen(anydata.getWhenStatement());
 915             emitIfFeatures(anydata.getIfFeatures());
 916             emitMustNodes(anydata.getMusts());
 917             emitConfigNode(anydata.getConfig());
 918             emitMandatoryNode(anydata.getMandatory());
 919             emitDocumentedNodeWithStatus(anydata);
 920             emitUnknownStatementNodes(anydata);
 921             super.writer.endNode();
 922         }
 923
 924         private void emitUsesNode(final UsesStatement uses) {
 925             super.writer.startUsesNode(uses.rawArgument());
 926             emitWhen(uses.getWhenStatement());
 927             emitIfFeatures(uses.getIfFeatures());
 928             emitDocumentedNodeWithStatus(uses);
 929             for (final RefineStatement refine : uses.getRefines()) {
 930                 emitRefine(refine);
 931             }
 932             for (final AugmentStatement aug : uses.getAugments()) {
 933                 emitUsesAugmentNode(aug);
 934             }
 935             super.writer.endNode();
 936         }
 937
 938         private void emitRefine(final RefineStatement refine) {
 939             super.writer.startRefineNode(refine.rawArgument());
 940             emitDocumentedNode(refine);
 941             emitIfFeatures(refine.getIfFeatures());
 942             emitMustNodes(refine.getMusts());
 943             emitPresenceNode(refine.getPresence());
 944             emitDefaultNodes(refine.getDefaults());
 945             emitConfigNode(refine.getConfig());
 946             emitMandatoryNode(refine.getMandatory());
 947             emitMinElementsNode(refine.getMinElements());
 948             emitMaxElementsNode(refine.getMaxElements());
 949             super.writer.endNode();
 950         }
 951
 952         private void emitUsesAugmentNode(final AugmentStatement aug) {
 953             /**
 954              * differs only in location in schema, otherwise currently (as of
 955              * RFC6020) it is same, so we could freely reuse path.
 956              */
 957             emitAugment(aug);
 958         }
 959
 960         private void emitAugment(final AugmentStatement augmentation) {
 961             super.writer.startAugmentNode(augmentation.rawArgument());
 962             emitIfFeatures(augmentation.getIfFeatures());
 963             emitWhen(augmentation.getWhenStatement());
 964             emitDocumentedNodeWithStatus(augmentation);
 965             emitDataNodeContainer(augmentation);
 966             emitCases(augmentation.getCases());
 967             emitUnknownStatementNodes(augmentation);
 968             emitNotifications(augmentation.getNotifications());
 969             emitActions(augmentation.getActions());
 970             super.writer.endNode();
 971         }
 972
 973         private void emitUnknownStatementNodes(final DeclaredStatement<?> decaredStmt) {
 974             final Collection<? extends DeclaredStatement<?>> unknownStmts = Collections2
 975                     .filter(decaredStmt.declaredSubstatements(), Predicates.instanceOf(UnknownStatement.class));
 976             for (final DeclaredStatement<?> unknonwnStmt : unknownStmts) {
 977                 emitUnknownStatementNode(unknonwnStmt);
 978             }
 979         }
 980
 981         private void emitUnknownStatementNode(final DeclaredStatement<?> unknonwnStmt) {
 982             final StatementDefinition def = unknonwnStmt.statementDefinition();
 983             if (def.getArgumentName() == null) {
 984                 super.writer.startUnknownNode(def);
 985             } else {
 986                 super.writer.startUnknownNode(def, unknonwnStmt.rawArgument());
 987             }
 988             emitUnknownStatementNodes(unknonwnStmt);
 989             super.writer.endNode();
 990         }
 991
 992         private void emitWhen(final WhenStatement whenStatement) {
 993             if (whenStatement != null) {
 994                 super.writer.startWhenNode(whenStatement.rawArgument());
 995                 emitDocumentedNode(whenStatement);
 996                 super.writer.endNode();
 997             }
 998         }
 999
1000         private void emitRpc(final RpcStatement rpc) {
1001             super.writer.startRpcNode(rpc.rawArgument());
1002             emitOperationBody(rpc);
1003             emitUnknownStatementNodes(rpc);
1004             super.writer.endNode();
1005         }
1006
1007         private void emitOperationBody(final OperationGroup operationStmt) {
1008             emitIfFeatures(operationStmt.getIfFeatures());
1009             emitStatusNode(operationStmt.getStatus());
1010             emitDescriptionNode(operationStmt.getDescription());
1011             emitReferenceNode(operationStmt.getReference());
1012
1013             for (final TypedefStatement typedef : operationStmt.getTypedefs()) {
1014                 emitTypedefNode(typedef);
1015             }
1016             for (final GroupingStatement grouping : operationStmt.getGroupings()) {
1017                 emitGrouping(grouping);
1018             }
1019             emitInput(operationStmt.getInput());
1020             emitOutput(operationStmt.getOutput());
1021         }
1022
1023         private void emitActions(final Collection<? extends ActionStatement> collection) {
1024             for (final ActionStatement actionDefinition : collection) {
1025                 emitAction(actionDefinition);
1026             }
1027         }
1028
1029         private void emitAction(final ActionStatement actionDefinition) {
1030             super.writer.startActionNode(actionDefinition.rawArgument());
1031             emitOperationBody(actionDefinition);
1032             emitUnknownStatementNodes(actionDefinition);
1033             super.writer.endNode();
1034         }
1035
1036         private void emitInput(final InputStatement inputStatement) {
1037             if (isExplicitStatement(inputStatement)) {
1038                 super.writer.startInputNode();
1039                 emitMustNodes(inputStatement.getMusts());
1040                 emitDataNodeContainer(inputStatement);
1041                 emitUnknownStatementNodes(inputStatement);
1042                 super.writer.endNode();
1043             }
1044         }
1045
1046         private void emitOutput(final OutputStatement output) {
1047             if (isExplicitStatement(output)) {
1048                 super.writer.startOutputNode();
1049                 emitMustNodes(output.getMusts());
1050                 emitDataNodeContainer(output);
1051                 emitUnknownStatementNodes(output);
1052                 super.writer.endNode();
1053             }
1054         }
1055
1056         private static boolean isExplicitStatement(final DeclaredStatement<?> stmt) {
1057             return stmt != null && stmt.getStatementSource() == StatementSource.DECLARATION;
1058         }
1059
1060         private void emitNotifications(final Collection<? extends NotificationStatement> collection) {
1061             for (final NotificationStatement notification : collection) {
1062                 emitNotificationNode(notification);
1063             }
1064         }
1065
1066         private void emitNotificationNode(final NotificationStatement notification) {
1067             super.writer.startNotificationNode(notification.rawArgument());
1068             emitIfFeatures(notification.getIfFeatures());
1069             emitMustNodes(notification.getMusts());
1070             emitDocumentedNodeWithStatus(notification);
1071             emitDataNodeContainer(notification);
1072             emitUnknownStatementNodes(notification);
1073             super.writer.endNode();
1074         }
1075
1076         private void emitDeviation(final DeviationStatement deviation) {
1077             super.writer.startDeviationNode(deviation.rawArgument());
1078             emitDeviateStatements(deviation.getDeviateStatements());
1079             emitUnknownStatementNodes(deviation);
1080             super.writer.endNode();
1081         }
1082
1083         private void emitDeviateStatements(final Collection<? extends DeviateStatement> deviateStatements) {
1084             for (final DeviateStatement deviateStatement : deviateStatements) {
1085                 emitDeviate(deviateStatement);
1086             }
1087         }
1088
1089         private void emitDeviate(final DeviateStatement deviateStatement) {
1090             super.writer.startDeviateNode(deviateStatement.rawArgument());
1091             /*
1092              * :FIXME Currently, DeviateStatementImpl contains implementation
1093              * for all deviate types (i.e. add, replace, delete). However it
1094              * would be better to create subinterfaces of DeviateStatement for
1095              * each deviate type (i.e. AddDeviateStatement,
1096              * ReplaceDeviateStatement,..) and create argument specific supports
1097              * (i.e. definitions) for each deviate type (very similarly like by
1098              * TypeStatement).
1099              */
1100             for (final DeclaredStatement<?> child : deviateStatement.declaredSubstatements()) {
1101                 if (child instanceof MustStatement) {
1102                     emitMust((MustStatement) child);
1103                 } else if (child instanceof DefaultStatement) {
1104                     emitDefaultNode((DefaultStatement) child);
1105                 } else if (child instanceof UniqueStatement) {
1106                     emitUnique((UniqueStatement) child);
1107                 } else if (child instanceof UnitsStatement) {
1108                     emitUnitsNode((UnitsStatement) child);
1109                 } else if (child instanceof TypeStatement) {
1110                     emitType((TypeStatement) child);
1111                 } else if (child instanceof MinElementsStatement) {
1112                     emitMinElementsNode((MinElementsStatement) child);
1113                 } else if (child instanceof MaxElementsStatement) {
1114                     emitMaxElementsNode((MaxElementsStatement) child);
1115                 } else if (child instanceof MandatoryStatement) {
1116                     emitMandatoryNode((MandatoryStatement) child);
1117                 } else if (child instanceof ConfigStatement) {
1118                     emitConfigNode((ConfigStatement) child);
1119                 } else if (child instanceof UnknownStatement) {
1120                     emitUnknownStatementNode(child);
1121                 }
1122             }
1123             super.writer.endNode();
1124         }
1125     }
1126
1127     static class EffectiveSchemaContextEmitter extends SchemaContextEmitter {
1128
1129         EffectiveSchemaContextEmitter(final YangModuleWriter writer, final Map<QName, StatementDefinition> extensions,
1130                 final YangVersion yangVersion, final boolean emitInstantiated) {
1131             super(writer, extensions, yangVersion, emitInstantiated, true);
1132         }
1133
1134         void emitModule(final Module input) {
1135             super.writer.startModuleNode(input.getName());
1136             emitModuleHeader(input);
1137             emitLinkageNodes(input);
1138             emitMetaNodes(input);
1139             emitRevisionNodes(input);
1140             emitBodyNodes(input);
1141             super.writer.endNode();
1142         }
1143
1144         private void emitModuleHeader(final Module input) {
1145             emitYangVersionNode(input.getYangVersion());
1146             emitNamespace(input.getNamespace());
1147             emitPrefixNode(input.getPrefix());
1148         }
1149
1150         @SuppressWarnings("unused")
1151         private void emitSubmodule(final String input) {
1152             /*
1153              * FIXME: BUG-2444: Implement submodule export
1154              *
1155              * submoduleHeaderNodes linkageNodes metaNodes revisionNodes
1156              * bodyNodes super.writer.endNode();
1157              */
1158         }
1159
1160         @SuppressWarnings("unused")
1161         private void emitSubmoduleHeaderNodes(final Module input) {
1162             /*
1163              * FIXME: BUG-2444: Implement submodule headers properly
1164              *
1165              * :yangVersionNode //Optional
1166              *
1167              * :belongsToNode
1168              */
1169         }
1170
1171         private void emitMetaNodes(final Module input) {
1172             emitOrganizationNode(input.getOrganization());
1173             emitContact(input.getContact());
1174             emitDescriptionNode(input.getDescription());
1175             emitReferenceNode(input.getReference());
1176         }
1177
1178         private void emitLinkageNodes(final Module input) {
1179             for (final ModuleImport importNode : input.getImports()) {
1180                 emitImport(importNode);
1181             }
1182             /*
1183              * FIXME: BUG-2444: Emit include statements
1184              */
1185         }
1186
1187         private void emitRevisionNodes(final Module input) {
1188             /*
1189              * FIXME: BUG-2444: emit revisions properly, when parsed model will
1190              * provide enough information
1191              */
1192             emitRevision(input.getRevision());
1193
1194         }
1195
1196         private void emitBodyNodes(final Module input) {
1197
1198             for (final ExtensionDefinition extension : input.getExtensionSchemaNodes()) {
1199                 emitExtension(extension);
1200             }
1201             for (final FeatureDefinition definition : input.getFeatures()) {
1202                 emitFeature(definition);
1203             }
1204             for (final IdentitySchemaNode identity : input.getIdentities()) {
1205                 emitIdentity(identity);
1206             }
1207             for (final Deviation deviation : input.getDeviations()) {
1208                 emitDeviation(deviation);
1209             }
1210
1211             emitDataNodeContainer(input);
1212
1213             for (final AugmentationSchema augmentation : input.getAugmentations()) {
1214                 emitAugment(augmentation);
1215             }
1216             for (final RpcDefinition rpc : input.getRpcs()) {
1217                 emitRpc(rpc);
1218             }
1219
1220             emitNotifications(input.getNotifications());
1221         }
1222
1223         private void emitDataNodeContainer(final DataNodeContainer input) {
1224             for (final TypeDefinition<?> typedef : input.getTypeDefinitions()) {
1225                 emitTypedefNode(typedef);
1226             }
1227             for (final GroupingDefinition grouping : input.getGroupings()) {
1228                 emitGrouping(grouping);
1229             }
1230             for (final DataSchemaNode child : input.getChildNodes()) {
1231                 emitDataSchemaNode(child);
1232             }
1233             for (final UsesNode usesNode : input.getUses()) {
1234                 emitUsesNode(usesNode);
1235             }
1236         }
1237
1238         private void emitDataSchemaNode(final DataSchemaNode child) {
1239             if (!super.emitInstantiated && (child.isAddedByUses() || child.isAugmenting())) {
1240                 // We skip instantiated nodes.
1241                 return;
1242             }
1243
1244             if (child instanceof ContainerSchemaNode) {
1245                 emitContainer((ContainerSchemaNode) child);
1246             } else if (child instanceof LeafSchemaNode) {
1247                 emitLeaf((LeafSchemaNode) child);
1248             } else if (child instanceof LeafListSchemaNode) {
1249                 emitLeafList((LeafListSchemaNode) child);
1250             } else if (child instanceof ListSchemaNode) {
1251                 emitList((ListSchemaNode) child);
1252             } else if (child instanceof ChoiceSchemaNode) {
1253                 emitChoice((ChoiceSchemaNode) child);
1254             } else if (child instanceof AnyXmlSchemaNode) {
1255                 emitAnyxml((AnyXmlSchemaNode) child);
1256             } else if (child instanceof AnyDataSchemaNode) {
1257                 emitAnydata((AnyDataSchemaNode) child);
1258             } else {
1259                 throw new UnsupportedOperationException("Not supported DataSchemaNode type " + child.getClass());
1260             }
1261         }
1262
1263         private void emitYangVersionNode(final YangVersion input) {
1264             super.writer.startYangVersionNode(input.toString());
1265             super.writer.endNode();
1266         }
1267
1268         private void emitImport(final ModuleImport importNode) {
1269             super.writer.startImportNode(importNode.getModuleName());
1270             emitDescriptionNode(importNode.getDescription());
1271             emitReferenceNode(importNode.getReference());
1272             emitPrefixNode(importNode.getPrefix());
1273             emitRevisionDateNode(importNode.getRevision());
1274             super.writer.endNode();
1275         }
1276
1277         @SuppressWarnings("unused")
1278         private void emitInclude(final String input) {
1279             /*
1280              * FIXME: BUG-2444: Implement proper export of include statements
1281              * startIncludeNode(IdentifierHelper.getIdentifier(String :input));
1282              *
1283              *
1284              * :revisionDateNode :super.writer.endNode();)
1285              */
1286         }
1287
1288         private void emitNamespace(final URI uri) {
1289             super.writer.startNamespaceNode(uri);
1290             super.writer.endNode();
1291
1292         }
1293
1294         private void emitPrefixNode(final String input) {
1295             super.writer.startPrefixNode(input);
1296             super.writer.endNode();
1297
1298         }
1299
1300         @SuppressWarnings("unused")
1301         private void emitBelongsTo(final String input) {
1302             /*
1303              * FIXME: BUG-2444: Implement proper export of belongs-to statements
1304              * startIncludeNode(IdentifierHelper.getIdentifier(String :input));
1305              *
1306              *
1307              * :super.writer.startBelongsToNode(IdentifierHelper.getIdentifier(
1308              * String :input));
1309              *
1310              *
1311              * :prefixNode :super.writer.endNode();
1312              *
1313              */
1314
1315         }
1316
1317         private void emitOrganizationNode(final String input) {
1318             if (!Strings.isNullOrEmpty(input)) {
1319                 super.writer.startOrganizationNode(input);
1320                 super.writer.endNode();
1321             }
1322         }
1323
1324         private void emitContact(final String input) {
1325             if (!Strings.isNullOrEmpty(input)) {
1326                 super.writer.startContactNode(input);
1327                 super.writer.endNode();
1328             }
1329         }
1330
1331         private void emitDescriptionNode(@Nullable final String input) {
1332             if (!Strings.isNullOrEmpty(input)) {
1333                 super.writer.startDescriptionNode(input);
1334                 super.writer.endNode();
1335             }
1336         }
1337
1338         private void emitReferenceNode(@Nullable final String input) {
1339             if (!Strings.isNullOrEmpty(input)) {
1340                 super.writer.startReferenceNode(input);
1341                 super.writer.endNode();
1342             }
1343         }
1344
1345         private void emitUnitsNode(@Nullable final String input) {
1346             if (!Strings.isNullOrEmpty(input)) {
1347                 super.writer.startUnitsNode(input);
1348                 super.writer.endNode();
1349             }
1350         }
1351
1352         private void emitRevision(final Date date) {
1353             super.writer.startRevisionNode(date);
1354
1355             //
1356             // FIXME: BUG-2444: FIXME: BUG-2444: BUG-2417: descriptionNode
1357             // //FIXME: BUG-2444: Optional
1358             // FIXME: BUG-2444: FIXME: BUG-2444: BUG-2417: referenceNode
1359             // //FIXME: BUG-2444: Optional
1360             super.writer.endNode();
1361
1362         }
1363
1364         private void emitRevisionDateNode(@Nullable final Date date) {
1365             if (date != null) {
1366                 super.writer.startRevisionDateNode(date);
1367                 super.writer.endNode();
1368             }
1369         }
1370
1371         private void emitExtension(final ExtensionDefinition extension) {
1372             super.writer.startExtensionNode(extension.getQName());
1373             emitArgument(extension.getArgument(), extension.isYinElement());
1374             emitStatusNode(extension.getStatus());
1375             emitDescriptionNode(extension.getDescription());
1376             emitReferenceNode(extension.getReference());
1377             emitUnknownStatementNodes(extension.getUnknownSchemaNodes());
1378             super.writer.endNode();
1379
1380         }
1381
1382         private void emitArgument(final @Nullable String input, final boolean yinElement) {
1383             if (input != null) {
1384                 super.writer.startArgumentNode(input);
1385                 emitYinElement(yinElement);
1386                 super.writer.endNode();
1387             }
1388
1389         }
1390
1391         private void emitYinElement(final boolean yinElement) {
1392             super.writer.startYinElementNode(yinElement);
1393             super.writer.endNode();
1394
1395         }
1396
1397         private void emitIdentity(final IdentitySchemaNode identity) {
1398             super.writer.startIdentityNode(identity.getQName());
1399             emitBaseIdentities(identity.getBaseIdentities());
1400             emitStatusNode(identity.getStatus());
1401             emitDescriptionNode(identity.getDescription());
1402             emitReferenceNode(identity.getReference());
1403             super.writer.endNode();
1404         }
1405
1406         private void emitBaseIdentities(final Set<IdentitySchemaNode> identities) {
1407             for (final IdentitySchemaNode identitySchemaNode : identities) {
1408                 emitBase(identitySchemaNode.getQName());
1409             }
1410         }
1411
1412         private void emitBase(final QName qName) {
1413             super.writer.startBaseNode(qName);
1414             super.writer.endNode();
1415         }
1416
1417         private void emitFeature(final FeatureDefinition definition) {
1418             super.writer.startFeatureNode(definition.getQName());
1419
1420             // FIXME: BUG-2444: FIXME: BUG-2444: Expose ifFeature
1421             // *(ifFeatureNode )
1422             emitStatusNode(definition.getStatus());
1423             emitDescriptionNode(definition.getDescription());
1424             emitReferenceNode(definition.getReference());
1425             super.writer.endNode();
1426
1427         }
1428
1429         @SuppressWarnings("unused")
1430         private void emitIfFeature(final String input) {
1431             /*
1432              * FIXME: BUG-2444: Implement proper export of include statements
1433              * startIncludeNode(IdentifierHelper.getIdentifier(String :input));
1434              *
1435              */
1436         }
1437
1438         private void emitTypedefNode(final TypeDefinition<?> typedef) {
1439             super.writer.startTypedefNode(typedef.getQName());
1440             // Differentiate between derived type and existing type
1441             // name.
1442             emitTypeNodeDerived(typedef);
1443             emitUnitsNode(typedef.getUnits());
1444             emitDefaultNode(typedef.getDefaultValue());
1445             emitStatusNode(typedef.getStatus());
1446             emitDescriptionNode(typedef.getDescription());
1447             emitReferenceNode(typedef.getReference());
1448             emitUnknownStatementNodes(typedef.getUnknownSchemaNodes());
1449             super.writer.endNode();
1450
1451         }
1452
1453         private void emitTypeNode(final SchemaPath parentPath, final TypeDefinition<?> subtype) {
1454             final SchemaPath path = subtype.getPath();
1455             if (isPrefix(parentPath.getPathFromRoot(), path.getPathFromRoot())) {
1456                 emitTypeNodeDerived(subtype);
1457             } else {
1458                 emitTypeNodeReferenced(subtype);
1459             }
1460         }
1461
1462         private void emitTypeNodeReferenced(final TypeDefinition<?> typeDefinition) {
1463             super.writer.startTypeNode(typeDefinition.getQName());
1464             super.writer.endNode();
1465
1466         }
1467
1468         private void emitTypeNodeDerived(final TypeDefinition<?> typeDefinition) {
1469             final TypeDefinition<?> b = typeDefinition.getBaseType();
1470             final TypeDefinition<?> baseType = b == null ? typeDefinition : b;
1471             super.writer.startTypeNode(baseType.getQName());
1472             emitTypeBodyNodes(typeDefinition);
1473             super.writer.endNode();
1474
1475         }
1476
1477         private void emitTypeBodyNodes(final TypeDefinition<?> typeDef) {
1478             if (typeDef instanceof UnsignedIntegerTypeDefinition) {
1479                 emitUnsignedIntegerSpecification((UnsignedIntegerTypeDefinition) typeDef);
1480             } else if (typeDef instanceof IntegerTypeDefinition) {
1481                 emitIntegerSpefication((IntegerTypeDefinition) typeDef);
1482             } else if (typeDef instanceof DecimalTypeDefinition) {
1483                 emitDecimal64Specification((DecimalTypeDefinition) typeDef);
1484             } else if (typeDef instanceof StringTypeDefinition) {
1485                 emitStringRestrictions((StringTypeDefinition) typeDef);
1486             } else if (typeDef instanceof EnumTypeDefinition) {
1487                 emitEnumSpecification((EnumTypeDefinition) typeDef);
1488             } else if (typeDef instanceof LeafrefTypeDefinition) {
1489                 emitLeafrefSpecification((LeafrefTypeDefinition) typeDef);
1490             } else if (typeDef instanceof IdentityrefTypeDefinition) {
1491                 emitIdentityrefSpecification((IdentityrefTypeDefinition) typeDef);
1492             } else if (typeDef instanceof InstanceIdentifierTypeDefinition) {
1493                 emitInstanceIdentifierSpecification((InstanceIdentifierTypeDefinition) typeDef);
1494             } else if (typeDef instanceof BitsTypeDefinition) {
1495                 emitBitsSpecification((BitsTypeDefinition) typeDef);
1496             } else if (typeDef instanceof UnionTypeDefinition) {
1497                 emitUnionSpecification((UnionTypeDefinition) typeDef);
1498             } else if (typeDef instanceof BinaryTypeDefinition) {
1499                 ((BinaryTypeDefinition) typeDef).getLengthConstraint().ifPresent(this::emitLength);
1500             } else if (typeDef instanceof BooleanTypeDefinition || typeDef instanceof EmptyTypeDefinition) {
1501                 // NOOP
1502             } else {
1503                 throw new IllegalArgumentException("Not supported type " + typeDef.getClass());
1504             }
1505         }
1506
1507         private void emitIntegerSpefication(final IntegerTypeDefinition typeDef) {
1508             emitRangeNodeOptional(typeDef.getRangeConstraints());
1509         }
1510
1511         private void emitUnsignedIntegerSpecification(final UnsignedIntegerTypeDefinition typeDef) {
1512             emitRangeNodeOptional(typeDef.getRangeConstraints());
1513
1514         }
1515
1516         private void emitRangeNodeOptional(final List<RangeConstraint> list) {
1517             // FIXME: BUG-2444: Wrong decomposition in API, should be
1518             // LenghtConstraint
1519             // which contains ranges.
1520             if (!list.isEmpty()) {
1521                 super.writer.startRangeNode(toRangeString(list));
1522                 final RangeConstraint first = list.iterator().next();
1523                 emitErrorMessageNode(first.getErrorMessage());
1524                 emitErrorAppTagNode(first.getErrorAppTag());
1525                 emitDescriptionNode(first.getDescription());
1526                 emitReferenceNode(first.getReference());
1527                 super.writer.endNode();
1528             }
1529
1530         }
1531
1532         private void emitDecimal64Specification(final DecimalTypeDefinition typeDefinition) {
1533             emitFranctionDigitsNode(typeDefinition.getFractionDigits());
1534             emitRangeNodeOptional(typeDefinition.getRangeConstraints());
1535
1536         }
1537
1538         private void emitFranctionDigitsNode(final Integer fractionDigits) {
1539             super.writer.startFractionDigitsNode(fractionDigits);
1540             super.writer.endNode();
1541         }
1542
1543         private void emitStringRestrictions(final StringTypeDefinition typeDef) {
1544             typeDef.getLengthConstraint().ifPresent(this::emitLength);
1545
1546             for (final PatternConstraint pattern : typeDef.getPatternConstraints()) {
1547                 emitPatternNode(pattern);
1548             }
1549         }
1550
1551         private void emitLength(final LengthConstraint constraint) {
1552             super.writer.startLengthNode(toLengthString(constraint.getAllowedRanges()));
1553             emitErrorMessageNode(constraint.getErrorMessage());
1554             emitErrorAppTagNode(constraint.getErrorAppTag());
1555             emitDescriptionNode(constraint.getDescription());
1556             emitReferenceNode(constraint.getReference());
1557             super.writer.endNode();
1558         }
1559
1560         private static String toLengthString(final RangeSet<Integer> ranges) {
1561             final Iterator<Range<Integer>> it = ranges.asRanges().iterator();
1562             if (!it.hasNext()) {
1563                 return "";
1564             }
1565
1566             final StringBuilder sb = new StringBuilder();
1567             boolean haveNext;
1568             do {
1569                 final Range<Integer> current = it.next();
1570                 haveNext = it.hasNext();
1571                 appendRange(sb, current.lowerEndpoint(), current.upperEndpoint(), haveNext);
1572             } while (haveNext);
1573
1574             return sb.toString();
1575         }
1576
1577         private static String toRangeString(final List<RangeConstraint> list) {
1578             final Iterator<RangeConstraint> it = list.iterator();
1579             if (!it.hasNext()) {
1580                 return "";
1581             }
1582
1583             final StringBuilder sb = new StringBuilder();
1584             boolean haveNext;
1585             do {
1586                 final RangeConstraint current = it.next();
1587                 haveNext = it.hasNext();
1588                 appendRange(sb, current.getMin(), current.getMax(), haveNext);
1589             } while (haveNext);
1590
1591             return sb.toString();
1592         }
1593
1594         private static void appendRange(final StringBuilder sb, final Number min, final Number max,
1595                 final boolean haveNext) {
1596             sb.append(min);
1597             if (!min.equals(max)) {
1598                 sb.append("..");
1599                 sb.append(max);
1600             }
1601             if (haveNext) {
1602                 sb.append('|');
1603             }
1604         }
1605
1606         private void emitPatternNode(final PatternConstraint pattern) {
1607             super.writer.startPatternNode(pattern.getRawRegularExpression());
1608             // FIXME: BUG-2444: Optional
1609             emitErrorMessageNode(pattern.getErrorMessage());
1610             // FIXME: BUG-2444: Optional
1611             emitErrorAppTagNode(pattern.getErrorAppTag());
1612             emitDescriptionNode(pattern.getDescription());
1613             emitModifier(pattern.getModifier());
1614             super.writer.endNode();
1615         }
1616
1617         private void emitModifier(final ModifierKind modifier) {
1618             if (modifier != null) {
1619                 super.writer.startModifierNode(modifier);
1620                 super.writer.endNode();
1621             }
1622         }
1623
1624         private void emitDefaultNodes(final Collection<String> defaults) {
1625             for (final String defaultValue : defaults) {
1626                 emitDefaultNode(defaultValue);
1627             }
1628         }
1629
1630         private void emitDefaultNode(@Nullable final Object object) {
1631             if (object != null) {
1632                 super.writer.startDefaultNode(object.toString());
1633                 super.writer.endNode();
1634             }
1635         }
1636
1637         private void emitEnumSpecification(final EnumTypeDefinition typeDefinition) {
1638             for (final EnumPair enumValue : typeDefinition.getValues()) {
1639                 emitEnumNode(enumValue);
1640             }
1641         }
1642
1643         private void emitEnumNode(final EnumPair enumValue) {
1644             super.writer.startEnumNode(enumValue.getName());
1645             emitValueNode(enumValue.getValue());
1646             emitStatusNode(enumValue.getStatus());
1647             emitDescriptionNode(enumValue.getDescription());
1648             emitReferenceNode(enumValue.getReference());
1649             super.writer.endNode();
1650         }
1651
1652         private void emitLeafrefSpecification(final LeafrefTypeDefinition typeDefinition) {
1653             emitPathNode(typeDefinition.getPathStatement());
1654             if (YangVersion.VERSION_1_1 == super.yangVersion) {
1655                 emitRequireInstanceNode(typeDefinition.requireInstance());
1656             }
1657         }
1658
1659         private void emitPathNode(final RevisionAwareXPath revisionAwareXPath) {
1660             super.writer.startPathNode(revisionAwareXPath);
1661             super.writer.endNode();
1662         }
1663
1664         private void emitRequireInstanceNode(final boolean require) {
1665             super.writer.startRequireInstanceNode(require);
1666             super.writer.endNode();
1667         }
1668
1669         private void emitInstanceIdentifierSpecification(final InstanceIdentifierTypeDefinition typeDefinition) {
1670             emitRequireInstanceNode(typeDefinition.requireInstance());
1671         }
1672
1673         private void emitIdentityrefSpecification(final IdentityrefTypeDefinition typeDefinition) {
1674             emitBaseIdentities(typeDefinition.getIdentities());
1675         }
1676
1677         private void emitUnionSpecification(final UnionTypeDefinition typeDefinition) {
1678             for (final TypeDefinition<?> subtype : typeDefinition.getTypes()) {
1679                 // FIXME: BUG-2444: What if we have locally modified types here?
1680                 // is solution to look-up in schema path?
1681                 emitTypeNode(typeDefinition.getPath(), subtype);
1682             }
1683         }
1684
1685         private void emitBitsSpecification(final BitsTypeDefinition typeDefinition) {
1686             for (final Bit bit : typeDefinition.getBits()) {
1687                 emitBit(bit);
1688             }
1689         }
1690
1691         private void emitBit(final Bit bit) {
1692             super.writer.startBitNode(bit.getName());
1693             emitPositionNode(bit.getPosition());
1694             emitStatusNode(bit.getStatus());
1695             emitDescriptionNode(bit.getDescription());
1696             emitReferenceNode(bit.getReference());
1697             super.writer.endNode();
1698         }
1699
1700         private void emitPositionNode(@Nullable final Long position) {
1701             if (position != null) {
1702                 super.writer.startPositionNode(UnsignedInteger.valueOf(position));
1703                 super.writer.endNode();
1704             }
1705         }
1706
1707         private void emitStatusNode(@Nullable final Status status) {
1708             if (status != null) {
1709                 super.writer.startStatusNode(status);
1710                 super.writer.endNode();
1711             }
1712         }
1713
1714         private void emitConfigNode(final boolean config) {
1715             super.writer.startConfigNode(config);
1716             super.writer.endNode();
1717         }
1718
1719         private void emitMandatoryNode(final boolean mandatory) {
1720             super.writer.startMandatoryNode(mandatory);
1721             super.writer.endNode();
1722         }
1723
1724         private void emitPresenceNode(final boolean presence) {
1725             super.writer.startPresenceNode(presence);
1726             super.writer.endNode();
1727         }
1728
1729         private void emitOrderedBy(final boolean userOrdered) {
1730             if (userOrdered) {
1731                 super.writer.startOrderedByNode("user");
1732             } else {
1733                 super.writer.startOrderedByNode("system");
1734             }
1735             super.writer.endNode();
1736         }
1737
1738         private void emitMust(@Nullable final MustDefinition mustCondition) {
1739             if (mustCondition != null && mustCondition.getXpath() != null) {
1740                 super.writer.startMustNode(mustCondition.getXpath());
1741                 emitErrorMessageNode(mustCondition.getErrorMessage());
1742                 emitErrorAppTagNode(mustCondition.getErrorAppTag());
1743                 emitDescriptionNode(mustCondition.getDescription());
1744                 emitReferenceNode(mustCondition.getReference());
1745                 super.writer.endNode();
1746             }
1747
1748         }
1749
1750         private void emitErrorMessageNode(@Nullable final String input) {
1751             if (input != null && !input.isEmpty()) {
1752                 super.writer.startErrorMessageNode(input);
1753                 super.writer.endNode();
1754             }
1755         }
1756
1757         private void emitErrorAppTagNode(final String input) {
1758             if (input != null && !input.isEmpty()) {
1759                 super.writer.startErrorAppTagNode(input);
1760                 super.writer.endNode();
1761             }
1762         }
1763
1764         private void emitMinElementsNode(final Integer min) {
1765             if (min != null) {
1766                 super.writer.startMinElementsNode(min);
1767                 super.writer.endNode();
1768             }
1769         }
1770
1771         private void emitMaxElementsNode(final Integer max) {
1772             if (max != null) {
1773                 super.writer.startMaxElementsNode(max);
1774                 super.writer.endNode();
1775             }
1776         }
1777
1778         private void emitValueNode(@Nullable final Integer value) {
1779             if (value != null) {
1780                 super.writer.startValueNode(value);
1781                 super.writer.endNode();
1782             }
1783         }
1784
1785         private void emitDocumentedNode(final DocumentedNode.WithStatus input) {
1786             emitStatusNode(input.getStatus());
1787             emitDescriptionNode(input.getDescription());
1788             emitReferenceNode(input.getReference());
1789         }
1790
1791         private void emitGrouping(final GroupingDefinition grouping) {
1792             super.writer.startGroupingNode(grouping.getQName());
1793             emitDocumentedNode(grouping);
1794             emitDataNodeContainer(grouping);
1795             emitUnknownStatementNodes(grouping.getUnknownSchemaNodes());
1796             emitNotifications(grouping.getNotifications());
1797             emitActions(grouping.getActions());
1798             super.writer.endNode();
1799
1800         }
1801
1802         private void emitContainer(final ContainerSchemaNode child) {
1803             super.writer.startContainerNode(child.getQName());
1804             emitConstraints(child.getConstraints());
1805             // FIXME: BUG-2444: whenNode //:Optional
1806             // FIXME: BUG-2444: *(ifFeatureNode )
1807             emitPresenceNode(child.isPresenceContainer());
1808             emitConfigNode(child.isConfiguration());
1809             emitDocumentedNode(child);
1810             emitDataNodeContainer(child);
1811             emitUnknownStatementNodes(child.getUnknownSchemaNodes());
1812             emitNotifications(child.getNotifications());
1813             emitActions(child.getActions());
1814             super.writer.endNode();
1815
1816         }
1817
1818         private void emitConstraints(final ConstraintDefinition constraints) {
1819             emitWhen(constraints.getWhenCondition());
1820             for (final MustDefinition mustCondition : constraints.getMustConstraints()) {
1821                 emitMust(mustCondition);
1822             }
1823         }
1824
1825         private void emitLeaf(final LeafSchemaNode child) {
1826             super.writer.startLeafNode(child.getQName());
1827             emitWhen(child.getConstraints().getWhenCondition());
1828             // FIXME: BUG-2444: *(ifFeatureNode )
1829             emitTypeNode(child.getPath(), child.getType());
1830             emitUnitsNode(child.getUnits());
1831             emitMustNodes(child.getConstraints().getMustConstraints());
1832             emitDefaultNode(child.getDefault());
1833             emitConfigNode(child.isConfiguration());
1834             emitMandatoryNode(child.getConstraints().isMandatory());
1835             emitDocumentedNode(child);
1836             emitUnknownStatementNodes(child.getUnknownSchemaNodes());
1837             super.writer.endNode();
1838
1839         }
1840
1841         private void emitLeafList(final LeafListSchemaNode child) {
1842             super.writer.startLeafListNode(child.getQName());
1843
1844             emitWhen(child.getConstraints().getWhenCondition());
1845             // FIXME: BUG-2444: *(ifFeatureNode )
1846             emitTypeNode(child.getPath(), child.getType());
1847             emitUnitsNode(child.getType().getUnits());
1848             // FIXME: BUG-2444: unitsNode /Optional
1849             emitMustNodes(child.getConstraints().getMustConstraints());
1850             emitConfigNode(child.isConfiguration());
1851             emitDefaultNodes(child.getDefaults());
1852             emitMinElementsNode(child.getConstraints().getMinElements());
1853             emitMaxElementsNode(child.getConstraints().getMaxElements());
1854             emitOrderedBy(child.isUserOrdered());
1855             emitDocumentedNode(child);
1856             emitUnknownStatementNodes(child.getUnknownSchemaNodes());
1857             super.writer.endNode();
1858
1859         }
1860
1861         private void emitList(final ListSchemaNode child) {
1862             super.writer.startListNode(child.getQName());
1863             emitWhen(child.getConstraints().getWhenCondition());
1864
1865             // FIXME: BUG-2444: *(ifFeatureNode )
1866             emitMustNodes(child.getConstraints().getMustConstraints());
1867             emitKey(child.getKeyDefinition());
1868             emitUniqueConstraints(child.getUniqueConstraints());
1869             emitConfigNode(child.isConfiguration());
1870             emitMinElementsNode(child.getConstraints().getMinElements());
1871             emitMaxElementsNode(child.getConstraints().getMaxElements());
1872             emitOrderedBy(child.isUserOrdered());
1873             emitDocumentedNode(child);
1874             emitDataNodeContainer(child);
1875             emitUnknownStatementNodes(child.getUnknownSchemaNodes());
1876             emitNotifications(child.getNotifications());
1877             emitActions(child.getActions());
1878             super.writer.endNode();
1879
1880         }
1881
1882         private void emitMustNodes(final Set<MustDefinition> mustConstraints) {
1883             for (final MustDefinition must : mustConstraints) {
1884                 emitMust(must);
1885             }
1886         }
1887
1888         private void emitKey(final List<QName> keyList) {
1889             if (keyList != null && !keyList.isEmpty()) {
1890                 super.writer.startKeyNode(keyList);
1891                 super.writer.endNode();
1892             }
1893         }
1894
1895         private void emitUniqueConstraints(final Collection<UniqueConstraint> uniqueConstraints) {
1896             for (final UniqueConstraint uniqueConstraint : uniqueConstraints) {
1897                 emitUnique(uniqueConstraint);
1898             }
1899         }
1900
1901         private void emitUnique(final UniqueConstraint uniqueConstraint) {
1902             super.writer.startUniqueNode(uniqueConstraint);
1903             super.writer.endNode();
1904         }
1905
1906         private void emitChoice(final ChoiceSchemaNode choice) {
1907             super.writer.startChoiceNode(choice.getQName());
1908             emitWhen(choice.getConstraints().getWhenCondition());
1909             // FIXME: BUG-2444: *(ifFeatureNode )
1910             // FIXME: BUG-2444: defaultNode //Optional
1911             emitConfigNode(choice.isConfiguration());
1912             emitMandatoryNode(choice.getConstraints().isMandatory());
1913             emitDocumentedNode(choice);
1914             for (final ChoiceCaseNode caze : choice.getCases()) {
1915                 // TODO: emit short case?
1916                 emitCaseNode(caze);
1917             }
1918             emitUnknownStatementNodes(choice.getUnknownSchemaNodes());
1919             super.writer.endNode();
1920         }
1921
1922         private void emitCaseNode(final ChoiceCaseNode caze) {
1923             if (!super.emitInstantiated && caze.isAugmenting()) {
1924                 return;
1925             }
1926             super.writer.startCaseNode(caze.getQName());
1927             emitWhen(caze.getConstraints().getWhenCondition());
1928             // FIXME: BUG-2444: *(ifFeatureNode )
1929             emitDocumentedNode(caze);
1930             emitDataNodeContainer(caze);
1931             emitUnknownStatementNodes(caze.getUnknownSchemaNodes());
1932             super.writer.endNode();
1933
1934         }
1935
1936         private void emitAnyxml(final AnyXmlSchemaNode anyxml) {
1937             super.writer.startAnyxmlNode(anyxml.getQName());
1938             emitBodyOfDataSchemaNode(anyxml);
1939             super.writer.endNode();
1940         }
1941
1942         private void emitAnydata(final AnyDataSchemaNode anydata) {
1943             super.writer.startAnydataNode(anydata.getQName());
1944             emitBodyOfDataSchemaNode(anydata);
1945             super.writer.endNode();
1946         }
1947
1948         private void emitBodyOfDataSchemaNode(final DataSchemaNode dataSchemaNode) {
1949             emitWhen(dataSchemaNode.getConstraints().getWhenCondition());
1950             // FIXME: BUG-2444: *(ifFeatureNode )
1951             emitMustNodes(dataSchemaNode.getConstraints().getMustConstraints());
1952             emitConfigNode(dataSchemaNode.isConfiguration());
1953             emitMandatoryNode(dataSchemaNode.getConstraints().isMandatory());
1954             emitDocumentedNode(dataSchemaNode);
1955             emitUnknownStatementNodes(dataSchemaNode.getUnknownSchemaNodes());
1956         }
1957
1958         private void emitUsesNode(final UsesNode usesNode) {
1959             if (super.emitUses && !usesNode.isAddedByUses() && !usesNode.isAugmenting()) {
1960                 super.writer.startUsesNode(usesNode.getGroupingPath().getLastComponent());
1961                 /*
1962                  * FIXME: BUG-2444: whenNode / *(ifFeatureNode ) statusNode //
1963                  * Optional F : descriptionNode // Optional referenceNode //
1964                  * Optional
1965                  */
1966                 for (final Entry<SchemaPath, SchemaNode> refine : usesNode.getRefines().entrySet()) {
1967                     emitRefine(refine);
1968                 }
1969                 for (final AugmentationSchema aug : usesNode.getAugmentations()) {
1970                     emitUsesAugmentNode(aug);
1971                 }
1972                 super.writer.endNode();
1973             }
1974         }
1975
1976         private void emitRefine(final Entry<SchemaPath, SchemaNode> refine) {
1977             final SchemaPath path = refine.getKey();
1978             final SchemaNode value = refine.getValue();
1979             super.writer.startRefineNode(path);
1980
1981             if (value instanceof LeafSchemaNode) {
1982                 emitRefineLeafNodes((LeafSchemaNode) value);
1983             } else if (value instanceof LeafListSchemaNode) {
1984                 emitRefineLeafListNodes((LeafListSchemaNode) value);
1985             } else if (value instanceof ListSchemaNode) {
1986                 emitRefineListNodes((ListSchemaNode) value);
1987             } else if (value instanceof ChoiceSchemaNode) {
1988                 emitRefineChoiceNodes((ChoiceSchemaNode) value);
1989             } else if (value instanceof ChoiceCaseNode) {
1990                 emitRefineCaseNodes((ChoiceCaseNode) value);
1991             } else if (value instanceof ContainerSchemaNode) {
1992                 emitRefineContainerNodes((ContainerSchemaNode) value);
1993             } else if (value instanceof AnyXmlSchemaNode) {
1994                 emitRefineAnyxmlNodes((AnyXmlSchemaNode) value);
1995             }
1996             super.writer.endNode();
1997
1998         }
1999
2000         private static <T extends SchemaNode> T getOriginalChecked(final T value) {
2001             final Optional<SchemaNode> original = SchemaNodeUtils.getOriginalIfPossible(value);
2002             Preconditions.checkArgument(original.isPresent(), "Original unmodified version of node is not present.");
2003             @SuppressWarnings("unchecked")
2004             final T ret = (T) original.get();
2005             return ret;
2006         }
2007
2008         private void emitDocumentedNodeRefine(final DocumentedNode original, final DocumentedNode value) {
2009             if (Objects.deepEquals(original.getDescription(), value.getDescription())) {
2010                 emitDescriptionNode(value.getDescription());
2011             }
2012             if (Objects.deepEquals(original.getReference(), value.getReference())) {
2013                 emitReferenceNode(value.getReference());
2014             }
2015         }
2016
2017         private void emitRefineContainerNodes(final ContainerSchemaNode value) {
2018             final ContainerSchemaNode original = getOriginalChecked(value);
2019
2020             // emitMustNodes(child.getConstraints().getMustConstraints());
2021             if (Objects.deepEquals(original.isPresenceContainer(), value.isPresenceContainer())) {
2022                 emitPresenceNode(value.isPresenceContainer());
2023             }
2024             if (Objects.deepEquals(original.isConfiguration(), value.isConfiguration())) {
2025                 emitConfigNode(value.isConfiguration());
2026             }
2027             emitDocumentedNodeRefine(original, value);
2028
2029         }
2030
2031         private void emitRefineLeafNodes(final LeafSchemaNode value) {
2032             final LeafSchemaNode original = getOriginalChecked(value);
2033
2034             // emitMustNodes(child.getConstraints().getMustConstraints());
2035             if (Objects.deepEquals(original.getDefault(), value.getDefault())) {
2036                 emitDefaultNode(value.getDefault());
2037             }
2038             if (Objects.deepEquals(original.isConfiguration(), value.isConfiguration())) {
2039                 emitConfigNode(value.isConfiguration());
2040             }
2041             emitDocumentedNodeRefine(original, value);
2042             if (Objects.deepEquals(original.getConstraints().isMandatory(), value.getConstraints().isMandatory())) {
2043                 emitMandatoryNode(value.getConstraints().isMandatory());
2044             }
2045
2046         }
2047
2048         private void emitRefineLeafListNodes(final LeafListSchemaNode value) {
2049             final LeafListSchemaNode original = getOriginalChecked(value);
2050
2051             // emitMustNodes(child.getConstraints().getMustConstraints());
2052             if (Objects.deepEquals(original.isConfiguration(), value.isConfiguration())) {
2053                 emitConfigNode(value.isConfiguration());
2054             }
2055             if (Objects.deepEquals(original.getConstraints().getMinElements(),
2056                     value.getConstraints().getMinElements())) {
2057                 emitMinElementsNode(value.getConstraints().getMinElements());
2058             }
2059             if (Objects.deepEquals(original.getConstraints().getMaxElements(),
2060                     value.getConstraints().getMaxElements())) {
2061                 emitMaxElementsNode(value.getConstraints().getMaxElements());
2062             }
2063             emitDocumentedNodeRefine(original, value);
2064
2065         }
2066
2067         private void emitRefineListNodes(final ListSchemaNode value) {
2068             final ListSchemaNode original = getOriginalChecked(value);
2069
2070             // emitMustNodes(child.getConstraints().getMustConstraints());
2071             if (Objects.deepEquals(original.isConfiguration(), value.isConfiguration())) {
2072                 emitConfigNode(value.isConfiguration());
2073             }
2074             if (Objects.deepEquals(original.getConstraints().getMinElements(),
2075                     value.getConstraints().getMinElements())) {
2076                 emitMinElementsNode(value.getConstraints().getMinElements());
2077             }
2078             if (Objects.deepEquals(original.getConstraints().getMaxElements(),
2079                     value.getConstraints().getMaxElements())) {
2080                 emitMaxElementsNode(value.getConstraints().getMaxElements());
2081             }
2082             emitDocumentedNodeRefine(original, value);
2083
2084         }
2085
2086         private void emitRefineChoiceNodes(final ChoiceSchemaNode value) {
2087             final ChoiceSchemaNode original = getOriginalChecked(value);
2088
2089             // FIXME: BUG-2444: defaultNode //FIXME: BUG-2444: Optional
2090             if (Objects.deepEquals(original.isConfiguration(), value.isConfiguration())) {
2091                 emitConfigNode(value.isConfiguration());
2092             }
2093             if (Objects.deepEquals(original.getConstraints().isMandatory(), value.getConstraints().isMandatory())) {
2094                 emitMandatoryNode(value.getConstraints().isMandatory());
2095             }
2096             emitDocumentedNodeRefine(original, value);
2097
2098         }
2099
2100         private void emitRefineCaseNodes(final ChoiceCaseNode value) {
2101             final ChoiceCaseNode original = getOriginalChecked(value);
2102             emitDocumentedNodeRefine(original, value);
2103
2104         }
2105
2106         private void emitRefineAnyxmlNodes(final AnyXmlSchemaNode value) {
2107             final AnyXmlSchemaNode original = getOriginalChecked(value);
2108
2109             // FIXME: BUG-2444:
2110             // emitMustNodes(child.getConstraints().getMustConstraints());
2111             if (Objects.deepEquals(original.isConfiguration(), value.isConfiguration())) {
2112                 emitConfigNode(value.isConfiguration());
2113             }
2114             if (Objects.deepEquals(original.getConstraints().isMandatory(), value.getConstraints().isMandatory())) {
2115                 emitMandatoryNode(value.getConstraints().isMandatory());
2116             }
2117             emitDocumentedNodeRefine(original, value);
2118
2119         }
2120
2121         private void emitUsesAugmentNode(final AugmentationSchema aug) {
2122             /**
2123              * differs only in location in schema, otherwise currently (as of
2124              * RFC6020) it is same, so we could freely reuse path.
2125              */
2126             emitAugment(aug);
2127         }
2128
2129         private void emitAugment(final AugmentationSchema augmentation) {
2130             super.writer.startAugmentNode(augmentation.getTargetPath());
2131             // FIXME: BUG-2444: whenNode //Optional
2132             // FIXME: BUG-2444: *(ifFeatureNode )
2133
2134             emitStatusNode(augmentation.getStatus());
2135             emitDescriptionNode(augmentation.getDescription());
2136             emitReferenceNode(augmentation.getReference());
2137             for (final UsesNode uses : augmentation.getUses()) {
2138                 emitUsesNode(uses);
2139             }
2140
2141             for (final DataSchemaNode childNode : augmentation.getChildNodes()) {
2142                 if (childNode instanceof ChoiceCaseNode) {
2143                     emitCaseNode((ChoiceCaseNode) childNode);
2144                 } else {
2145                     emitDataSchemaNode(childNode);
2146                 }
2147             }
2148             emitUnknownStatementNodes(augmentation.getUnknownSchemaNodes());
2149             emitNotifications(augmentation.getNotifications());
2150             emitActions(augmentation.getActions());
2151             super.writer.endNode();
2152         }
2153
2154         private void emitUnknownStatementNodes(final List<UnknownSchemaNode> unknownNodes) {
2155             for (final UnknownSchemaNode unknonwnNode : unknownNodes) {
2156                 if (!unknonwnNode.isAddedByAugmentation() && !unknonwnNode.isAddedByUses()) {
2157                     emitUnknownStatementNode(unknonwnNode);
2158                 }
2159             }
2160         }
2161
2162         private void emitUnknownStatementNode(final UnknownSchemaNode node) {
2163             final StatementDefinition def = getStatementChecked(node.getNodeType());
2164             if (def.getArgumentName() == null) {
2165                 super.writer.startUnknownNode(def);
2166             } else {
2167                 super.writer.startUnknownNode(def, node.getNodeParameter());
2168             }
2169             emitUnknownStatementNodes(node.getUnknownSchemaNodes());
2170             super.writer.endNode();
2171         }
2172
2173         private StatementDefinition getStatementChecked(final QName nodeType) {
2174             final StatementDefinition ret = super.extensions.get(nodeType);
2175             Preconditions.checkArgument(ret != null, "Unknown extension %s used during export.", nodeType);
2176             return ret;
2177         }
2178
2179         private void emitWhen(final RevisionAwareXPath revisionAwareXPath) {
2180             if (revisionAwareXPath != null) {
2181                 super.writer.startWhenNode(revisionAwareXPath);
2182                 super.writer.endNode();
2183             }
2184             // FIXME: BUG-2444: descriptionNode //FIXME: BUG-2444: Optional
2185             // FIXME: BUG-2444: referenceNode //FIXME: BUG-2444: Optional
2186             // FIXME: BUG-2444: super.writer.endNode();)
2187
2188         }
2189
2190         private void emitRpc(final RpcDefinition rpc) {
2191             super.writer.startRpcNode(rpc.getQName());
2192             emitOperationBody(rpc);
2193             super.writer.endNode();
2194         }
2195
2196         private void emitOperationBody(final OperationDefinition rpc) {
2197             // FIXME: BUG-2444: *(ifFeatureNode )
2198             emitStatusNode(rpc.getStatus());
2199             emitDescriptionNode(rpc.getDescription());
2200             emitReferenceNode(rpc.getReference());
2201
2202             for (final TypeDefinition<?> typedef : rpc.getTypeDefinitions()) {
2203                 emitTypedefNode(typedef);
2204             }
2205             for (final GroupingDefinition grouping : rpc.getGroupings()) {
2206                 emitGrouping(grouping);
2207             }
2208             emitInput(rpc.getInput());
2209             emitOutput(rpc.getOutput());
2210             emitUnknownStatementNodes(rpc.getUnknownSchemaNodes());
2211         }
2212
2213         private void emitActions(final Set<ActionDefinition> actions) {
2214             for (final ActionDefinition actionDefinition : actions) {
2215                 emitAction(actionDefinition);
2216             }
2217         }
2218
2219         private void emitAction(final ActionDefinition action) {
2220             if (!super.emitInstantiated && (action.isAddedByUses() || action.isAugmenting())) {
2221                 // We skip instantiated nodes.
2222                 return;
2223             }
2224             super.writer.startActionNode(action.getQName());
2225             emitOperationBody(action);
2226             super.writer.endNode();
2227         }
2228
2229         private void emitInput(@Nonnull final ContainerSchemaNode input) {
2230             if (isExplicitStatement(input)) {
2231                 super.writer.startInputNode();
2232                 emitConstraints(input.getConstraints());
2233                 emitDataNodeContainer(input);
2234                 emitUnknownStatementNodes(input.getUnknownSchemaNodes());
2235                 super.writer.endNode();
2236             }
2237
2238         }
2239
2240         private void emitOutput(@Nonnull final ContainerSchemaNode output) {
2241             if (isExplicitStatement(output)) {
2242                 super.writer.startOutputNode();
2243                 emitConstraints(output.getConstraints());
2244                 emitDataNodeContainer(output);
2245                 emitUnknownStatementNodes(output.getUnknownSchemaNodes());
2246                 super.writer.endNode();
2247             }
2248         }
2249
2250         private static boolean isExplicitStatement(final ContainerSchemaNode node) {
2251             return node instanceof EffectiveStatement && ((EffectiveStatement<?, ?>) node).getDeclared()
2252                     .getStatementSource() == StatementSource.DECLARATION;
2253         }
2254
2255         private void emitNotifications(final Set<NotificationDefinition> notifications) {
2256             for (final NotificationDefinition notification : notifications) {
2257                 emitNotificationNode(notification);
2258             }
2259         }
2260
2261         private void emitNotificationNode(final NotificationDefinition notification) {
2262             if (!super.emitInstantiated && (notification.isAddedByUses() || notification.isAugmenting())) {
2263                 // We skip instantiated nodes.
2264                 return;
2265             }
2266
2267             super.writer.startNotificationNode(notification.getQName());
2268             // FIXME: BUG-2444: *(ifFeatureNode )
2269             emitConstraints(notification.getConstraints());
2270             emitDocumentedNode(notification);
2271             emitDataNodeContainer(notification);
2272             emitUnknownStatementNodes(notification.getUnknownSchemaNodes());
2273             super.writer.endNode();
2274
2275         }
2276
2277         private void emitDeviation(final Deviation deviation) {
2278             /*
2279              * FIXME: BUG-2444: Deviation is not modeled properly and we are
2280              * loosing lot of information in order to export it properly
2281              *
2282              * super.writer.startDeviationNode(deviation.getTargetPath());
2283              *
2284              * :descriptionNode //:Optional
2285              *
2286              *
2287              * emitReferenceNode(deviation.getReference());
2288              * :(deviateNotSupportedNode :1*(deviateAddNode :deviateReplaceNode
2289              * :deviateDeleteNode)) :super.writer.endNode();
2290              */
2291         }
2292     }
2293 }