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.Iterator;
  21 import java.util.List;
  22 import java.util.Map;
  23 import java.util.Map.Entry;
  24 import java.util.Objects;
  25 import java.util.Optional;
  26 import java.util.Set;
  27 import javax.annotation.Nonnull;
  28 import javax.annotation.Nullable;
  29 import javax.annotation.concurrent.NotThreadSafe;
  30 import org.opendaylight.yangtools.yang.common.QName;
  31 import org.opendaylight.yangtools.yang.common.Revision;
  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.AugmentationSchemaNode;
  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             input.getOrganization().ifPresent(this::emitOrganizationNode);
1173             input.getContact().ifPresent(this::emitContact);
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             input.getRevision().ifPresent(this::emitRevision);
1193         }
1194
1195         private void emitBodyNodes(final Module input) {
1196
1197             for (final ExtensionDefinition extension : input.getExtensionSchemaNodes()) {
1198                 emitExtension(extension);
1199             }
1200             for (final FeatureDefinition definition : input.getFeatures()) {
1201                 emitFeature(definition);
1202             }
1203             for (final IdentitySchemaNode identity : input.getIdentities()) {
1204                 emitIdentity(identity);
1205             }
1206             for (final Deviation deviation : input.getDeviations()) {
1207                 emitDeviation(deviation);
1208             }
1209
1210             emitDataNodeContainer(input);
1211
1212             for (final AugmentationSchemaNode augmentation : input.getAugmentations()) {
1213                 emitAugment(augmentation);
1214             }
1215             for (final RpcDefinition rpc : input.getRpcs()) {
1216                 emitRpc(rpc);
1217             }
1218
1219             emitNotifications(input.getNotifications());
1220         }
1221
1222         private void emitDataNodeContainer(final DataNodeContainer input) {
1223             for (final TypeDefinition<?> typedef : input.getTypeDefinitions()) {
1224                 emitTypedefNode(typedef);
1225             }
1226             for (final GroupingDefinition grouping : input.getGroupings()) {
1227                 emitGrouping(grouping);
1228             }
1229             for (final DataSchemaNode child : input.getChildNodes()) {
1230                 emitDataSchemaNode(child);
1231             }
1232             for (final UsesNode usesNode : input.getUses()) {
1233                 emitUsesNode(usesNode);
1234             }
1235         }
1236
1237         private void emitDataSchemaNode(final DataSchemaNode child) {
1238             if (!super.emitInstantiated && (child.isAddedByUses() || child.isAugmenting())) {
1239                 // We skip instantiated nodes.
1240                 return;
1241             }
1242
1243             if (child instanceof ContainerSchemaNode) {
1244                 emitContainer((ContainerSchemaNode) child);
1245             } else if (child instanceof LeafSchemaNode) {
1246                 emitLeaf((LeafSchemaNode) child);
1247             } else if (child instanceof LeafListSchemaNode) {
1248                 emitLeafList((LeafListSchemaNode) child);
1249             } else if (child instanceof ListSchemaNode) {
1250                 emitList((ListSchemaNode) child);
1251             } else if (child instanceof ChoiceSchemaNode) {
1252                 emitChoice((ChoiceSchemaNode) child);
1253             } else if (child instanceof AnyXmlSchemaNode) {
1254                 emitAnyxml((AnyXmlSchemaNode) child);
1255             } else if (child instanceof AnyDataSchemaNode) {
1256                 emitAnydata((AnyDataSchemaNode) child);
1257             } else {
1258                 throw new UnsupportedOperationException("Not supported DataSchemaNode type " + child.getClass());
1259             }
1260         }
1261
1262         private void emitYangVersionNode(final YangVersion input) {
1263             super.writer.startYangVersionNode(input.toString());
1264             super.writer.endNode();
1265         }
1266
1267         private void emitImport(final ModuleImport importNode) {
1268             super.writer.startImportNode(importNode.getModuleName());
1269             emitDescriptionNode(importNode.getDescription());
1270             emitReferenceNode(importNode.getReference());
1271             emitPrefixNode(importNode.getPrefix());
1272
1273             importNode.getRevision().ifPresent(this::emitRevisionDateNode);
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             super.writer.startOrganizationNode(input);
1319             super.writer.endNode();
1320         }
1321
1322         private void emitContact(final String input) {
1323             super.writer.startContactNode(input);
1324             super.writer.endNode();
1325         }
1326
1327         private void emitDescriptionNode(@Nullable final String input) {
1328             if (!Strings.isNullOrEmpty(input)) {
1329                 super.writer.startDescriptionNode(input);
1330                 super.writer.endNode();
1331             }
1332         }
1333
1334         private void emitReferenceNode(@Nullable final String input) {
1335             if (!Strings.isNullOrEmpty(input)) {
1336                 super.writer.startReferenceNode(input);
1337                 super.writer.endNode();
1338             }
1339         }
1340
1341         private void emitUnitsNode(@Nullable final String input) {
1342             if (!Strings.isNullOrEmpty(input)) {
1343                 super.writer.startUnitsNode(input);
1344                 super.writer.endNode();
1345             }
1346         }
1347
1348         private void emitRevision(final Revision date) {
1349             if (date != null) {
1350                 super.writer.startRevisionNode(date);
1351
1352                 // FIXME: BUG-2444: FIXME: BUG-2444: BUG-2417: descriptionNode
1353                 // //FIXME: BUG-2444: Optional
1354                 // FIXME: BUG-2444: FIXME: BUG-2444: BUG-2417: referenceNode
1355                 // //FIXME: BUG-2444: Optional
1356                 super.writer.endNode();
1357             }
1358         }
1359
1360         private void emitRevisionDateNode(final Revision date) {
1361             super.writer.startRevisionDateNode(date);
1362             super.writer.endNode();
1363         }
1364
1365         private void emitExtension(final ExtensionDefinition extension) {
1366             super.writer.startExtensionNode(extension.getQName());
1367             emitArgument(extension.getArgument(), extension.isYinElement());
1368             emitStatusNode(extension.getStatus());
1369             emitDescriptionNode(extension.getDescription());
1370             emitReferenceNode(extension.getReference());
1371             emitUnknownStatementNodes(extension.getUnknownSchemaNodes());
1372             super.writer.endNode();
1373
1374         }
1375
1376         private void emitArgument(final @Nullable String input, final boolean yinElement) {
1377             if (input != null) {
1378                 super.writer.startArgumentNode(input);
1379                 emitYinElement(yinElement);
1380                 super.writer.endNode();
1381             }
1382
1383         }
1384
1385         private void emitYinElement(final boolean yinElement) {
1386             super.writer.startYinElementNode(yinElement);
1387             super.writer.endNode();
1388
1389         }
1390
1391         private void emitIdentity(final IdentitySchemaNode identity) {
1392             super.writer.startIdentityNode(identity.getQName());
1393             emitBaseIdentities(identity.getBaseIdentities());
1394             emitStatusNode(identity.getStatus());
1395             emitDescriptionNode(identity.getDescription());
1396             emitReferenceNode(identity.getReference());
1397             super.writer.endNode();
1398         }
1399
1400         private void emitBaseIdentities(final Set<IdentitySchemaNode> identities) {
1401             for (final IdentitySchemaNode identitySchemaNode : identities) {
1402                 emitBase(identitySchemaNode.getQName());
1403             }
1404         }
1405
1406         private void emitBase(final QName qName) {
1407             super.writer.startBaseNode(qName);
1408             super.writer.endNode();
1409         }
1410
1411         private void emitFeature(final FeatureDefinition definition) {
1412             super.writer.startFeatureNode(definition.getQName());
1413
1414             // FIXME: BUG-2444: FIXME: BUG-2444: Expose ifFeature
1415             // *(ifFeatureNode )
1416             emitStatusNode(definition.getStatus());
1417             emitDescriptionNode(definition.getDescription());
1418             emitReferenceNode(definition.getReference());
1419             super.writer.endNode();
1420
1421         }
1422
1423         @SuppressWarnings("unused")
1424         private void emitIfFeature(final String input) {
1425             /*
1426              * FIXME: BUG-2444: Implement proper export of include statements
1427              * startIncludeNode(IdentifierHelper.getIdentifier(String :input));
1428              *
1429              */
1430         }
1431
1432         private void emitTypedefNode(final TypeDefinition<?> typedef) {
1433             super.writer.startTypedefNode(typedef.getQName());
1434             // Differentiate between derived type and existing type
1435             // name.
1436             emitTypeNodeDerived(typedef);
1437             emitUnitsNode(typedef.getUnits());
1438             emitDefaultNode(typedef.getDefaultValue());
1439             emitStatusNode(typedef.getStatus());
1440             emitDescriptionNode(typedef.getDescription());
1441             emitReferenceNode(typedef.getReference());
1442             emitUnknownStatementNodes(typedef.getUnknownSchemaNodes());
1443             super.writer.endNode();
1444
1445         }
1446
1447         private void emitTypeNode(final SchemaPath parentPath, final TypeDefinition<?> subtype) {
1448             final SchemaPath path = subtype.getPath();
1449             if (isPrefix(parentPath.getPathFromRoot(), path.getPathFromRoot())) {
1450                 emitTypeNodeDerived(subtype);
1451             } else {
1452                 emitTypeNodeReferenced(subtype);
1453             }
1454         }
1455
1456         private void emitTypeNodeReferenced(final TypeDefinition<?> typeDefinition) {
1457             super.writer.startTypeNode(typeDefinition.getQName());
1458             super.writer.endNode();
1459
1460         }
1461
1462         private void emitTypeNodeDerived(final TypeDefinition<?> typeDefinition) {
1463             final TypeDefinition<?> b = typeDefinition.getBaseType();
1464             final TypeDefinition<?> baseType = b == null ? typeDefinition : b;
1465             super.writer.startTypeNode(baseType.getQName());
1466             emitTypeBodyNodes(typeDefinition);
1467             super.writer.endNode();
1468
1469         }
1470
1471         private void emitTypeBodyNodes(final TypeDefinition<?> typeDef) {
1472             if (typeDef instanceof UnsignedIntegerTypeDefinition) {
1473                 emitUnsignedIntegerSpecification((UnsignedIntegerTypeDefinition) typeDef);
1474             } else if (typeDef instanceof IntegerTypeDefinition) {
1475                 emitIntegerSpefication((IntegerTypeDefinition) typeDef);
1476             } else if (typeDef instanceof DecimalTypeDefinition) {
1477                 emitDecimal64Specification((DecimalTypeDefinition) typeDef);
1478             } else if (typeDef instanceof StringTypeDefinition) {
1479                 emitStringRestrictions((StringTypeDefinition) typeDef);
1480             } else if (typeDef instanceof EnumTypeDefinition) {
1481                 emitEnumSpecification((EnumTypeDefinition) typeDef);
1482             } else if (typeDef instanceof LeafrefTypeDefinition) {
1483                 emitLeafrefSpecification((LeafrefTypeDefinition) typeDef);
1484             } else if (typeDef instanceof IdentityrefTypeDefinition) {
1485                 emitIdentityrefSpecification((IdentityrefTypeDefinition) typeDef);
1486             } else if (typeDef instanceof InstanceIdentifierTypeDefinition) {
1487                 emitInstanceIdentifierSpecification((InstanceIdentifierTypeDefinition) typeDef);
1488             } else if (typeDef instanceof BitsTypeDefinition) {
1489                 emitBitsSpecification((BitsTypeDefinition) typeDef);
1490             } else if (typeDef instanceof UnionTypeDefinition) {
1491                 emitUnionSpecification((UnionTypeDefinition) typeDef);
1492             } else if (typeDef instanceof BinaryTypeDefinition) {
1493                 ((BinaryTypeDefinition) typeDef).getLengthConstraint().ifPresent(this::emitLength);
1494             } else if (typeDef instanceof BooleanTypeDefinition || typeDef instanceof EmptyTypeDefinition) {
1495                 // NOOP
1496             } else {
1497                 throw new IllegalArgumentException("Not supported type " + typeDef.getClass());
1498             }
1499         }
1500
1501         private void emitIntegerSpefication(final IntegerTypeDefinition typeDef) {
1502             emitRangeNodeOptional(typeDef.getRangeConstraints());
1503         }
1504
1505         private void emitUnsignedIntegerSpecification(final UnsignedIntegerTypeDefinition typeDef) {
1506             emitRangeNodeOptional(typeDef.getRangeConstraints());
1507
1508         }
1509
1510         private void emitRangeNodeOptional(final List<RangeConstraint> list) {
1511             // FIXME: BUG-2444: Wrong decomposition in API, should be
1512             // LenghtConstraint
1513             // which contains ranges.
1514             if (!list.isEmpty()) {
1515                 super.writer.startRangeNode(toRangeString(list));
1516                 final RangeConstraint first = list.iterator().next();
1517                 first.getErrorMessage().ifPresent(this::emitErrorMessageNode);
1518                 first.getErrorAppTag().ifPresent(this::emitErrorAppTagNode);
1519                 emitDescriptionNode(first.getDescription());
1520                 emitReferenceNode(first.getReference());
1521                 super.writer.endNode();
1522             }
1523
1524         }
1525
1526         private void emitDecimal64Specification(final DecimalTypeDefinition typeDefinition) {
1527             emitFranctionDigitsNode(typeDefinition.getFractionDigits());
1528             emitRangeNodeOptional(typeDefinition.getRangeConstraints());
1529
1530         }
1531
1532         private void emitFranctionDigitsNode(final Integer fractionDigits) {
1533             super.writer.startFractionDigitsNode(fractionDigits);
1534             super.writer.endNode();
1535         }
1536
1537         private void emitStringRestrictions(final StringTypeDefinition typeDef) {
1538             typeDef.getLengthConstraint().ifPresent(this::emitLength);
1539
1540             for (final PatternConstraint pattern : typeDef.getPatternConstraints()) {
1541                 emitPatternNode(pattern);
1542             }
1543         }
1544
1545         private void emitLength(final LengthConstraint constraint) {
1546             super.writer.startLengthNode(toLengthString(constraint.getAllowedRanges()));
1547             constraint.getErrorMessage().ifPresent(this::emitErrorMessageNode);
1548             constraint.getErrorAppTag().ifPresent(this::emitErrorAppTagNode);
1549             emitDescriptionNode(constraint.getDescription());
1550             emitReferenceNode(constraint.getReference());
1551             super.writer.endNode();
1552         }
1553
1554         private static String toLengthString(final RangeSet<Integer> ranges) {
1555             final Iterator<Range<Integer>> it = ranges.asRanges().iterator();
1556             if (!it.hasNext()) {
1557                 return "";
1558             }
1559
1560             final StringBuilder sb = new StringBuilder();
1561             boolean haveNext;
1562             do {
1563                 final Range<Integer> current = it.next();
1564                 haveNext = it.hasNext();
1565                 appendRange(sb, current.lowerEndpoint(), current.upperEndpoint(), haveNext);
1566             } while (haveNext);
1567
1568             return sb.toString();
1569         }
1570
1571         private static String toRangeString(final List<RangeConstraint> list) {
1572             final Iterator<RangeConstraint> it = list.iterator();
1573             if (!it.hasNext()) {
1574                 return "";
1575             }
1576
1577             final StringBuilder sb = new StringBuilder();
1578             boolean haveNext;
1579             do {
1580                 final RangeConstraint current = it.next();
1581                 haveNext = it.hasNext();
1582                 appendRange(sb, current.getMin(), current.getMax(), haveNext);
1583             } while (haveNext);
1584
1585             return sb.toString();
1586         }
1587
1588         private static void appendRange(final StringBuilder sb, final Number min, final Number max,
1589                 final boolean haveNext) {
1590             sb.append(min);
1591             if (!min.equals(max)) {
1592                 sb.append("..");
1593                 sb.append(max);
1594             }
1595             if (haveNext) {
1596                 sb.append('|');
1597             }
1598         }
1599
1600         private void emitPatternNode(final PatternConstraint pattern) {
1601             super.writer.startPatternNode(pattern.getRawRegularExpression());
1602             pattern.getErrorMessage().ifPresent(this::emitErrorMessageNode);
1603             pattern.getErrorAppTag().ifPresent(this::emitErrorAppTagNode);
1604             emitDescriptionNode(pattern.getDescription());
1605             emitModifier(pattern.getModifier());
1606             super.writer.endNode();
1607         }
1608
1609         private void emitModifier(final ModifierKind modifier) {
1610             if (modifier != null) {
1611                 super.writer.startModifierNode(modifier);
1612                 super.writer.endNode();
1613             }
1614         }
1615
1616         private void emitDefaultNodes(final Collection<String> defaults) {
1617             for (final String defaultValue : defaults) {
1618                 emitDefaultNode(defaultValue);
1619             }
1620         }
1621
1622         private void emitDefaultNode(@Nullable final Object object) {
1623             if (object != null) {
1624                 super.writer.startDefaultNode(object.toString());
1625                 super.writer.endNode();
1626             }
1627         }
1628
1629         private void emitEnumSpecification(final EnumTypeDefinition typeDefinition) {
1630             for (final EnumPair enumValue : typeDefinition.getValues()) {
1631                 emitEnumNode(enumValue);
1632             }
1633         }
1634
1635         private void emitEnumNode(final EnumPair enumValue) {
1636             super.writer.startEnumNode(enumValue.getName());
1637             emitValueNode(enumValue.getValue());
1638             emitStatusNode(enumValue.getStatus());
1639             emitDescriptionNode(enumValue.getDescription());
1640             emitReferenceNode(enumValue.getReference());
1641             super.writer.endNode();
1642         }
1643
1644         private void emitLeafrefSpecification(final LeafrefTypeDefinition typeDefinition) {
1645             emitPathNode(typeDefinition.getPathStatement());
1646             if (YangVersion.VERSION_1_1 == super.yangVersion) {
1647                 emitRequireInstanceNode(typeDefinition.requireInstance());
1648             }
1649         }
1650
1651         private void emitPathNode(final RevisionAwareXPath revisionAwareXPath) {
1652             super.writer.startPathNode(revisionAwareXPath);
1653             super.writer.endNode();
1654         }
1655
1656         private void emitRequireInstanceNode(final boolean require) {
1657             super.writer.startRequireInstanceNode(require);
1658             super.writer.endNode();
1659         }
1660
1661         private void emitInstanceIdentifierSpecification(final InstanceIdentifierTypeDefinition typeDefinition) {
1662             emitRequireInstanceNode(typeDefinition.requireInstance());
1663         }
1664
1665         private void emitIdentityrefSpecification(final IdentityrefTypeDefinition typeDefinition) {
1666             emitBaseIdentities(typeDefinition.getIdentities());
1667         }
1668
1669         private void emitUnionSpecification(final UnionTypeDefinition typeDefinition) {
1670             for (final TypeDefinition<?> subtype : typeDefinition.getTypes()) {
1671                 // FIXME: BUG-2444: What if we have locally modified types here?
1672                 // is solution to look-up in schema path?
1673                 emitTypeNode(typeDefinition.getPath(), subtype);
1674             }
1675         }
1676
1677         private void emitBitsSpecification(final BitsTypeDefinition typeDefinition) {
1678             for (final Bit bit : typeDefinition.getBits()) {
1679                 emitBit(bit);
1680             }
1681         }
1682
1683         private void emitBit(final Bit bit) {
1684             super.writer.startBitNode(bit.getName());
1685             emitPositionNode(bit.getPosition());
1686             emitStatusNode(bit.getStatus());
1687             emitDescriptionNode(bit.getDescription());
1688             emitReferenceNode(bit.getReference());
1689             super.writer.endNode();
1690         }
1691
1692         private void emitPositionNode(@Nullable final Long position) {
1693             if (position != null) {
1694                 super.writer.startPositionNode(UnsignedInteger.valueOf(position));
1695                 super.writer.endNode();
1696             }
1697         }
1698
1699         private void emitStatusNode(@Nullable final Status status) {
1700             if (status != null) {
1701                 super.writer.startStatusNode(status);
1702                 super.writer.endNode();
1703             }
1704         }
1705
1706         private void emitConfigNode(final boolean config) {
1707             super.writer.startConfigNode(config);
1708             super.writer.endNode();
1709         }
1710
1711         private void emitMandatoryNode(final boolean mandatory) {
1712             super.writer.startMandatoryNode(mandatory);
1713             super.writer.endNode();
1714         }
1715
1716         private void emitPresenceNode(final boolean presence) {
1717             super.writer.startPresenceNode(presence);
1718             super.writer.endNode();
1719         }
1720
1721         private void emitOrderedBy(final boolean userOrdered) {
1722             if (userOrdered) {
1723                 super.writer.startOrderedByNode("user");
1724             } else {
1725                 super.writer.startOrderedByNode("system");
1726             }
1727             super.writer.endNode();
1728         }
1729
1730         private void emitMust(@Nullable final MustDefinition mustCondition) {
1731             if (mustCondition != null && mustCondition.getXpath() != null) {
1732                 super.writer.startMustNode(mustCondition.getXpath());
1733                 mustCondition.getErrorMessage().ifPresent(this::emitErrorMessageNode);
1734                 mustCondition.getErrorAppTag().ifPresent(this::emitErrorAppTagNode);
1735                 emitDescriptionNode(mustCondition.getDescription());
1736                 emitReferenceNode(mustCondition.getReference());
1737                 super.writer.endNode();
1738             }
1739
1740         }
1741
1742         private void emitErrorMessageNode(@Nullable final String input) {
1743             super.writer.startErrorMessageNode(input);
1744             super.writer.endNode();
1745         }
1746
1747         private void emitErrorAppTagNode(final String input) {
1748             super.writer.startErrorAppTagNode(input);
1749             super.writer.endNode();
1750         }
1751
1752         private void emitMinElementsNode(final Integer min) {
1753             if (min != null) {
1754                 super.writer.startMinElementsNode(min);
1755                 super.writer.endNode();
1756             }
1757         }
1758
1759         private void emitMaxElementsNode(final Integer max) {
1760             if (max != null) {
1761                 super.writer.startMaxElementsNode(max);
1762                 super.writer.endNode();
1763             }
1764         }
1765
1766         private void emitValueNode(@Nullable final Integer value) {
1767             if (value != null) {
1768                 super.writer.startValueNode(value);
1769                 super.writer.endNode();
1770             }
1771         }
1772
1773         private void emitDocumentedNode(final DocumentedNode.WithStatus input) {
1774             emitStatusNode(input.getStatus());
1775             emitDescriptionNode(input.getDescription());
1776             emitReferenceNode(input.getReference());
1777         }
1778
1779         private void emitGrouping(final GroupingDefinition grouping) {
1780             super.writer.startGroupingNode(grouping.getQName());
1781             emitDocumentedNode(grouping);
1782             emitDataNodeContainer(grouping);
1783             emitUnknownStatementNodes(grouping.getUnknownSchemaNodes());
1784             emitNotifications(grouping.getNotifications());
1785             emitActions(grouping.getActions());
1786             super.writer.endNode();
1787
1788         }
1789
1790         private void emitContainer(final ContainerSchemaNode child) {
1791             super.writer.startContainerNode(child.getQName());
1792             emitConstraints(child.getConstraints());
1793             // FIXME: BUG-2444: whenNode //:Optional
1794             // FIXME: BUG-2444: *(ifFeatureNode )
1795             emitPresenceNode(child.isPresenceContainer());
1796             emitConfigNode(child.isConfiguration());
1797             emitDocumentedNode(child);
1798             emitDataNodeContainer(child);
1799             emitUnknownStatementNodes(child.getUnknownSchemaNodes());
1800             emitNotifications(child.getNotifications());
1801             emitActions(child.getActions());
1802             super.writer.endNode();
1803
1804         }
1805
1806         private void emitConstraints(final ConstraintDefinition constraints) {
1807             constraints.getWhenCondition().ifPresent(this::emitWhen);
1808             for (final MustDefinition mustCondition : constraints.getMustConstraints()) {
1809                 emitMust(mustCondition);
1810             }
1811         }
1812
1813         private void emitLeaf(final LeafSchemaNode child) {
1814             super.writer.startLeafNode(child.getQName());
1815             child.getConstraints().getWhenCondition().ifPresent(this::emitWhen);
1816             // FIXME: BUG-2444: *(ifFeatureNode )
1817             emitTypeNode(child.getPath(), child.getType());
1818             emitUnitsNode(child.getUnits());
1819             emitMustNodes(child.getConstraints().getMustConstraints());
1820             emitDefaultNode(child.getDefault());
1821             emitConfigNode(child.isConfiguration());
1822             emitMandatoryNode(child.getConstraints().isMandatory());
1823             emitDocumentedNode(child);
1824             emitUnknownStatementNodes(child.getUnknownSchemaNodes());
1825             super.writer.endNode();
1826
1827         }
1828
1829         private void emitLeafList(final LeafListSchemaNode child) {
1830             super.writer.startLeafListNode(child.getQName());
1831
1832             child.getConstraints().getWhenCondition().ifPresent(this::emitWhen);
1833             // FIXME: BUG-2444: *(ifFeatureNode )
1834             emitTypeNode(child.getPath(), child.getType());
1835             emitUnitsNode(child.getType().getUnits());
1836             // FIXME: BUG-2444: unitsNode /Optional
1837             emitMustNodes(child.getConstraints().getMustConstraints());
1838             emitConfigNode(child.isConfiguration());
1839             emitDefaultNodes(child.getDefaults());
1840             emitMinElementsNode(child.getConstraints().getMinElements());
1841             emitMaxElementsNode(child.getConstraints().getMaxElements());
1842             emitOrderedBy(child.isUserOrdered());
1843             emitDocumentedNode(child);
1844             emitUnknownStatementNodes(child.getUnknownSchemaNodes());
1845             super.writer.endNode();
1846
1847         }
1848
1849         private void emitList(final ListSchemaNode child) {
1850             super.writer.startListNode(child.getQName());
1851             child.getConstraints().getWhenCondition().ifPresent(this::emitWhen);
1852
1853             // FIXME: BUG-2444: *(ifFeatureNode )
1854             emitMustNodes(child.getConstraints().getMustConstraints());
1855             emitKey(child.getKeyDefinition());
1856             emitUniqueConstraints(child.getUniqueConstraints());
1857             emitConfigNode(child.isConfiguration());
1858             emitMinElementsNode(child.getConstraints().getMinElements());
1859             emitMaxElementsNode(child.getConstraints().getMaxElements());
1860             emitOrderedBy(child.isUserOrdered());
1861             emitDocumentedNode(child);
1862             emitDataNodeContainer(child);
1863             emitUnknownStatementNodes(child.getUnknownSchemaNodes());
1864             emitNotifications(child.getNotifications());
1865             emitActions(child.getActions());
1866             super.writer.endNode();
1867
1868         }
1869
1870         private void emitMustNodes(final Set<MustDefinition> mustConstraints) {
1871             for (final MustDefinition must : mustConstraints) {
1872                 emitMust(must);
1873             }
1874         }
1875
1876         private void emitKey(final List<QName> keyList) {
1877             if (keyList != null && !keyList.isEmpty()) {
1878                 super.writer.startKeyNode(keyList);
1879                 super.writer.endNode();
1880             }
1881         }
1882
1883         private void emitUniqueConstraints(final Collection<UniqueConstraint> uniqueConstraints) {
1884             for (final UniqueConstraint uniqueConstraint : uniqueConstraints) {
1885                 emitUnique(uniqueConstraint);
1886             }
1887         }
1888
1889         private void emitUnique(final UniqueConstraint uniqueConstraint) {
1890             super.writer.startUniqueNode(uniqueConstraint);
1891             super.writer.endNode();
1892         }
1893
1894         private void emitChoice(final ChoiceSchemaNode choice) {
1895             super.writer.startChoiceNode(choice.getQName());
1896             choice.getConstraints().getWhenCondition().ifPresent(this::emitWhen);
1897             // FIXME: BUG-2444: *(ifFeatureNode )
1898             // FIXME: BUG-2444: defaultNode //Optional
1899             emitConfigNode(choice.isConfiguration());
1900             emitMandatoryNode(choice.getConstraints().isMandatory());
1901             emitDocumentedNode(choice);
1902             for (final ChoiceCaseNode caze : choice.getCases()) {
1903                 // TODO: emit short case?
1904                 emitCaseNode(caze);
1905             }
1906             emitUnknownStatementNodes(choice.getUnknownSchemaNodes());
1907             super.writer.endNode();
1908         }
1909
1910         private void emitCaseNode(final ChoiceCaseNode caze) {
1911             if (!super.emitInstantiated && caze.isAugmenting()) {
1912                 return;
1913             }
1914             super.writer.startCaseNode(caze.getQName());
1915             caze.getConstraints().getWhenCondition().ifPresent(this::emitWhen);
1916             // FIXME: BUG-2444: *(ifFeatureNode )
1917             emitDocumentedNode(caze);
1918             emitDataNodeContainer(caze);
1919             emitUnknownStatementNodes(caze.getUnknownSchemaNodes());
1920             super.writer.endNode();
1921
1922         }
1923
1924         private void emitAnyxml(final AnyXmlSchemaNode anyxml) {
1925             super.writer.startAnyxmlNode(anyxml.getQName());
1926             emitBodyOfDataSchemaNode(anyxml);
1927             super.writer.endNode();
1928         }
1929
1930         private void emitAnydata(final AnyDataSchemaNode anydata) {
1931             super.writer.startAnydataNode(anydata.getQName());
1932             emitBodyOfDataSchemaNode(anydata);
1933             super.writer.endNode();
1934         }
1935
1936         private void emitBodyOfDataSchemaNode(final DataSchemaNode dataSchemaNode) {
1937             dataSchemaNode.getConstraints().getWhenCondition().ifPresent(this::emitWhen);
1938             // FIXME: BUG-2444: *(ifFeatureNode )
1939             emitMustNodes(dataSchemaNode.getConstraints().getMustConstraints());
1940             emitConfigNode(dataSchemaNode.isConfiguration());
1941             emitMandatoryNode(dataSchemaNode.getConstraints().isMandatory());
1942             emitDocumentedNode(dataSchemaNode);
1943             emitUnknownStatementNodes(dataSchemaNode.getUnknownSchemaNodes());
1944         }
1945
1946         private void emitUsesNode(final UsesNode usesNode) {
1947             if (super.emitUses && !usesNode.isAddedByUses() && !usesNode.isAugmenting()) {
1948                 super.writer.startUsesNode(usesNode.getGroupingPath().getLastComponent());
1949                 /*
1950                  * FIXME: BUG-2444: whenNode / *(ifFeatureNode ) statusNode //
1951                  * Optional F : descriptionNode // Optional referenceNode //
1952                  * Optional
1953                  */
1954                 for (final Entry<SchemaPath, SchemaNode> refine : usesNode.getRefines().entrySet()) {
1955                     emitRefine(refine);
1956                 }
1957                 for (final AugmentationSchemaNode aug : usesNode.getAugmentations()) {
1958                     emitUsesAugmentNode(aug);
1959                 }
1960                 super.writer.endNode();
1961             }
1962         }
1963
1964         private void emitRefine(final Entry<SchemaPath, SchemaNode> refine) {
1965             final SchemaPath path = refine.getKey();
1966             final SchemaNode value = refine.getValue();
1967             super.writer.startRefineNode(path);
1968
1969             if (value instanceof LeafSchemaNode) {
1970                 emitRefineLeafNodes((LeafSchemaNode) value);
1971             } else if (value instanceof LeafListSchemaNode) {
1972                 emitRefineLeafListNodes((LeafListSchemaNode) value);
1973             } else if (value instanceof ListSchemaNode) {
1974                 emitRefineListNodes((ListSchemaNode) value);
1975             } else if (value instanceof ChoiceSchemaNode) {
1976                 emitRefineChoiceNodes((ChoiceSchemaNode) value);
1977             } else if (value instanceof ChoiceCaseNode) {
1978                 emitRefineCaseNodes((ChoiceCaseNode) value);
1979             } else if (value instanceof ContainerSchemaNode) {
1980                 emitRefineContainerNodes((ContainerSchemaNode) value);
1981             } else if (value instanceof AnyXmlSchemaNode) {
1982                 emitRefineAnyxmlNodes((AnyXmlSchemaNode) value);
1983             }
1984             super.writer.endNode();
1985
1986         }
1987
1988         private static <T extends SchemaNode> T getOriginalChecked(final T value) {
1989             final Optional<SchemaNode> original = SchemaNodeUtils.getOriginalIfPossible(value);
1990             Preconditions.checkArgument(original.isPresent(), "Original unmodified version of node is not present.");
1991             @SuppressWarnings("unchecked")
1992             final T ret = (T) original.get();
1993             return ret;
1994         }
1995
1996         private void emitDocumentedNodeRefine(final DocumentedNode original, final DocumentedNode value) {
1997             if (Objects.deepEquals(original.getDescription(), value.getDescription())) {
1998                 emitDescriptionNode(value.getDescription());
1999             }
2000             if (Objects.deepEquals(original.getReference(), value.getReference())) {
2001                 emitReferenceNode(value.getReference());
2002             }
2003         }
2004
2005         private void emitRefineContainerNodes(final ContainerSchemaNode value) {
2006             final ContainerSchemaNode original = getOriginalChecked(value);
2007
2008             // emitMustNodes(child.getConstraints().getMustConstraints());
2009             if (Objects.deepEquals(original.isPresenceContainer(), value.isPresenceContainer())) {
2010                 emitPresenceNode(value.isPresenceContainer());
2011             }
2012             if (Objects.deepEquals(original.isConfiguration(), value.isConfiguration())) {
2013                 emitConfigNode(value.isConfiguration());
2014             }
2015             emitDocumentedNodeRefine(original, value);
2016
2017         }
2018
2019         private void emitRefineLeafNodes(final LeafSchemaNode value) {
2020             final LeafSchemaNode original = getOriginalChecked(value);
2021
2022             // emitMustNodes(child.getConstraints().getMustConstraints());
2023             if (Objects.deepEquals(original.getDefault(), value.getDefault())) {
2024                 emitDefaultNode(value.getDefault());
2025             }
2026             if (Objects.deepEquals(original.isConfiguration(), value.isConfiguration())) {
2027                 emitConfigNode(value.isConfiguration());
2028             }
2029             emitDocumentedNodeRefine(original, value);
2030             if (Objects.deepEquals(original.getConstraints().isMandatory(), value.getConstraints().isMandatory())) {
2031                 emitMandatoryNode(value.getConstraints().isMandatory());
2032             }
2033
2034         }
2035
2036         private void emitRefineLeafListNodes(final LeafListSchemaNode value) {
2037             final LeafListSchemaNode original = getOriginalChecked(value);
2038
2039             // emitMustNodes(child.getConstraints().getMustConstraints());
2040             if (Objects.deepEquals(original.isConfiguration(), value.isConfiguration())) {
2041                 emitConfigNode(value.isConfiguration());
2042             }
2043             if (Objects.deepEquals(original.getConstraints().getMinElements(),
2044                     value.getConstraints().getMinElements())) {
2045                 emitMinElementsNode(value.getConstraints().getMinElements());
2046             }
2047             if (Objects.deepEquals(original.getConstraints().getMaxElements(),
2048                     value.getConstraints().getMaxElements())) {
2049                 emitMaxElementsNode(value.getConstraints().getMaxElements());
2050             }
2051             emitDocumentedNodeRefine(original, value);
2052
2053         }
2054
2055         private void emitRefineListNodes(final ListSchemaNode value) {
2056             final ListSchemaNode original = getOriginalChecked(value);
2057
2058             // emitMustNodes(child.getConstraints().getMustConstraints());
2059             if (Objects.deepEquals(original.isConfiguration(), value.isConfiguration())) {
2060                 emitConfigNode(value.isConfiguration());
2061             }
2062             if (Objects.deepEquals(original.getConstraints().getMinElements(),
2063                     value.getConstraints().getMinElements())) {
2064                 emitMinElementsNode(value.getConstraints().getMinElements());
2065             }
2066             if (Objects.deepEquals(original.getConstraints().getMaxElements(),
2067                     value.getConstraints().getMaxElements())) {
2068                 emitMaxElementsNode(value.getConstraints().getMaxElements());
2069             }
2070             emitDocumentedNodeRefine(original, value);
2071
2072         }
2073
2074         private void emitRefineChoiceNodes(final ChoiceSchemaNode value) {
2075             final ChoiceSchemaNode original = getOriginalChecked(value);
2076
2077             // FIXME: BUG-2444: defaultNode //FIXME: BUG-2444: Optional
2078             if (Objects.deepEquals(original.isConfiguration(), value.isConfiguration())) {
2079                 emitConfigNode(value.isConfiguration());
2080             }
2081             if (Objects.deepEquals(original.getConstraints().isMandatory(), value.getConstraints().isMandatory())) {
2082                 emitMandatoryNode(value.getConstraints().isMandatory());
2083             }
2084             emitDocumentedNodeRefine(original, value);
2085
2086         }
2087
2088         private void emitRefineCaseNodes(final ChoiceCaseNode value) {
2089             final ChoiceCaseNode original = getOriginalChecked(value);
2090             emitDocumentedNodeRefine(original, value);
2091
2092         }
2093
2094         private void emitRefineAnyxmlNodes(final AnyXmlSchemaNode value) {
2095             final AnyXmlSchemaNode original = getOriginalChecked(value);
2096
2097             // FIXME: BUG-2444:
2098             // emitMustNodes(child.getConstraints().getMustConstraints());
2099             if (Objects.deepEquals(original.isConfiguration(), value.isConfiguration())) {
2100                 emitConfigNode(value.isConfiguration());
2101             }
2102             if (Objects.deepEquals(original.getConstraints().isMandatory(), value.getConstraints().isMandatory())) {
2103                 emitMandatoryNode(value.getConstraints().isMandatory());
2104             }
2105             emitDocumentedNodeRefine(original, value);
2106
2107         }
2108
2109         private void emitUsesAugmentNode(final AugmentationSchemaNode aug) {
2110             /**
2111              * differs only in location in schema, otherwise currently (as of
2112              * RFC6020) it is same, so we could freely reuse path.
2113              */
2114             emitAugment(aug);
2115         }
2116
2117         private void emitAugment(final AugmentationSchemaNode augmentation) {
2118             super.writer.startAugmentNode(augmentation.getTargetPath());
2119             // FIXME: BUG-2444: whenNode //Optional
2120             // FIXME: BUG-2444: *(ifFeatureNode )
2121
2122             emitStatusNode(augmentation.getStatus());
2123             emitDescriptionNode(augmentation.getDescription());
2124             emitReferenceNode(augmentation.getReference());
2125             for (final UsesNode uses : augmentation.getUses()) {
2126                 emitUsesNode(uses);
2127             }
2128
2129             for (final DataSchemaNode childNode : augmentation.getChildNodes()) {
2130                 if (childNode instanceof ChoiceCaseNode) {
2131                     emitCaseNode((ChoiceCaseNode) childNode);
2132                 } else {
2133                     emitDataSchemaNode(childNode);
2134                 }
2135             }
2136             emitUnknownStatementNodes(augmentation.getUnknownSchemaNodes());
2137             emitNotifications(augmentation.getNotifications());
2138             emitActions(augmentation.getActions());
2139             super.writer.endNode();
2140         }
2141
2142         private void emitUnknownStatementNodes(final List<UnknownSchemaNode> unknownNodes) {
2143             for (final UnknownSchemaNode unknonwnNode : unknownNodes) {
2144                 if (!unknonwnNode.isAddedByAugmentation() && !unknonwnNode.isAddedByUses()) {
2145                     emitUnknownStatementNode(unknonwnNode);
2146                 }
2147             }
2148         }
2149
2150         private void emitUnknownStatementNode(final UnknownSchemaNode node) {
2151             final StatementDefinition def = getStatementChecked(node.getNodeType());
2152             if (def.getArgumentName() == null) {
2153                 super.writer.startUnknownNode(def);
2154             } else {
2155                 super.writer.startUnknownNode(def, node.getNodeParameter());
2156             }
2157             emitUnknownStatementNodes(node.getUnknownSchemaNodes());
2158             super.writer.endNode();
2159         }
2160
2161         private StatementDefinition getStatementChecked(final QName nodeType) {
2162             final StatementDefinition ret = super.extensions.get(nodeType);
2163             Preconditions.checkArgument(ret != null, "Unknown extension %s used during export.", nodeType);
2164             return ret;
2165         }
2166
2167         private void emitWhen(final RevisionAwareXPath revisionAwareXPath) {
2168             if (revisionAwareXPath != null) {
2169                 super.writer.startWhenNode(revisionAwareXPath);
2170                 super.writer.endNode();
2171             }
2172             // FIXME: BUG-2444: descriptionNode //FIXME: BUG-2444: Optional
2173             // FIXME: BUG-2444: referenceNode //FIXME: BUG-2444: Optional
2174             // FIXME: BUG-2444: super.writer.endNode();)
2175
2176         }
2177
2178         private void emitRpc(final RpcDefinition rpc) {
2179             super.writer.startRpcNode(rpc.getQName());
2180             emitOperationBody(rpc);
2181             super.writer.endNode();
2182         }
2183
2184         private void emitOperationBody(final OperationDefinition rpc) {
2185             // FIXME: BUG-2444: *(ifFeatureNode )
2186             emitStatusNode(rpc.getStatus());
2187             emitDescriptionNode(rpc.getDescription());
2188             emitReferenceNode(rpc.getReference());
2189
2190             for (final TypeDefinition<?> typedef : rpc.getTypeDefinitions()) {
2191                 emitTypedefNode(typedef);
2192             }
2193             for (final GroupingDefinition grouping : rpc.getGroupings()) {
2194                 emitGrouping(grouping);
2195             }
2196             emitInput(rpc.getInput());
2197             emitOutput(rpc.getOutput());
2198             emitUnknownStatementNodes(rpc.getUnknownSchemaNodes());
2199         }
2200
2201         private void emitActions(final Set<ActionDefinition> actions) {
2202             for (final ActionDefinition actionDefinition : actions) {
2203                 emitAction(actionDefinition);
2204             }
2205         }
2206
2207         private void emitAction(final ActionDefinition action) {
2208             if (!super.emitInstantiated && (action.isAddedByUses() || action.isAugmenting())) {
2209                 // We skip instantiated nodes.
2210                 return;
2211             }
2212             super.writer.startActionNode(action.getQName());
2213             emitOperationBody(action);
2214             super.writer.endNode();
2215         }
2216
2217         private void emitInput(@Nonnull final ContainerSchemaNode input) {
2218             if (isExplicitStatement(input)) {
2219                 super.writer.startInputNode();
2220                 emitConstraints(input.getConstraints());
2221                 emitDataNodeContainer(input);
2222                 emitUnknownStatementNodes(input.getUnknownSchemaNodes());
2223                 super.writer.endNode();
2224             }
2225
2226         }
2227
2228         private void emitOutput(@Nonnull final ContainerSchemaNode output) {
2229             if (isExplicitStatement(output)) {
2230                 super.writer.startOutputNode();
2231                 emitConstraints(output.getConstraints());
2232                 emitDataNodeContainer(output);
2233                 emitUnknownStatementNodes(output.getUnknownSchemaNodes());
2234                 super.writer.endNode();
2235             }
2236         }
2237
2238         private static boolean isExplicitStatement(final ContainerSchemaNode node) {
2239             return node instanceof EffectiveStatement && ((EffectiveStatement<?, ?>) node).getDeclared()
2240                     .getStatementSource() == StatementSource.DECLARATION;
2241         }
2242
2243         private void emitNotifications(final Set<NotificationDefinition> notifications) {
2244             for (final NotificationDefinition notification : notifications) {
2245                 emitNotificationNode(notification);
2246             }
2247         }
2248
2249         private void emitNotificationNode(final NotificationDefinition notification) {
2250             if (!super.emitInstantiated && (notification.isAddedByUses() || notification.isAugmenting())) {
2251                 // We skip instantiated nodes.
2252                 return;
2253             }
2254
2255             super.writer.startNotificationNode(notification.getQName());
2256             // FIXME: BUG-2444: *(ifFeatureNode )
2257             emitConstraints(notification.getConstraints());
2258             emitDocumentedNode(notification);
2259             emitDataNodeContainer(notification);
2260             emitUnknownStatementNodes(notification.getUnknownSchemaNodes());
2261             super.writer.endNode();
2262
2263         }
2264
2265         private void emitDeviation(final Deviation deviation) {
2266             /*
2267              * FIXME: BUG-2444: Deviation is not modeled properly and we are
2268              * loosing lot of information in order to export it properly
2269              *
2270              * super.writer.startDeviationNode(deviation.getTargetPath());
2271              *
2272              * :descriptionNode //:Optional
2273              *
2274              *
2275              * emitReferenceNode(deviation.getReference());
2276              * :(deviateNotSupportedNode :1*(deviateAddNode :deviateReplaceNode
2277              * :deviateDeleteNode)) :super.writer.endNode();
2278              */
2279         }
2280     }
2281 }