yang/yang-parser-impl/src/main/java/org/opendaylight/yangtools/yang/parser/stmt/rfc6020/DeviateStatementImpl.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.parser.stmt.rfc6020;
   9
  10 import com.google.common.collect.ImmutableMap;
  11 import com.google.common.collect.ImmutableMap.Builder;
  12 import com.google.common.collect.ImmutableSet;
  13 import java.util.Collection;
  14 import java.util.Map;
  15 import java.util.Objects;
  16 import java.util.Set;
  17 import javax.annotation.Nonnull;
  18 import org.opendaylight.yangtools.yang.common.QNameModule;
  19 import org.opendaylight.yangtools.yang.common.YangVersion;
  20 import org.opendaylight.yangtools.yang.model.api.DeviateKind;
  21 import org.opendaylight.yangtools.yang.model.api.YangStmtMapping;
  22 import org.opendaylight.yangtools.yang.model.api.meta.EffectiveStatement;
  23 import org.opendaylight.yangtools.yang.model.api.meta.StatementDefinition;
  24 import org.opendaylight.yangtools.yang.model.api.stmt.DeviateStatement;
  25 import org.opendaylight.yangtools.yang.model.api.stmt.SchemaNodeIdentifier;
  26 import org.opendaylight.yangtools.yang.parser.spi.meta.AbstractDeclaredStatement;
  27 import org.opendaylight.yangtools.yang.parser.spi.meta.AbstractStatementSupport;
  28 import org.opendaylight.yangtools.yang.parser.spi.meta.CopyType;
  29 import org.opendaylight.yangtools.yang.parser.spi.meta.InferenceException;
  30 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelActionBuilder;
  31 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelActionBuilder.InferenceAction;
  32 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelActionBuilder.InferenceContext;
  33 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelActionBuilder.Prerequisite;
  34 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelProcessingPhase;
  35 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;
  36 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext.Mutable;
  37 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContextUtils;
  38 import org.opendaylight.yangtools.yang.parser.spi.meta.SubstatementValidator;
  39 import org.opendaylight.yangtools.yang.parser.spi.source.ModuleCtxToModuleQName;
  40 import org.opendaylight.yangtools.yang.parser.spi.source.ModulesDeviatedByModules;
  41 import org.opendaylight.yangtools.yang.parser.spi.source.ModulesDeviatedByModules.SupportedModules;
  42 import org.opendaylight.yangtools.yang.parser.spi.source.SourceException;
  43 import org.opendaylight.yangtools.yang.parser.stmt.reactor.StatementContextBase;
  44 import org.opendaylight.yangtools.yang.parser.stmt.rfc6020.effective.DeviateEffectiveStatementImpl;
  45 import org.slf4j.Logger;
  46 import org.slf4j.LoggerFactory;
  47
  48 public class DeviateStatementImpl extends AbstractDeclaredStatement<DeviateKind> implements DeviateStatement {
  49     private static final Logger LOG = LoggerFactory.getLogger(DeviateStatementImpl.class);
  50
  51     private static final SubstatementValidator DEVIATE_NOT_SUPPORTED_SUBSTATEMENT_VALIDATOR =
  52             SubstatementValidator.builder(YangStmtMapping.DEVIATE).build();
  53
  54     private static final SubstatementValidator DEVIATE_ADD_SUBSTATEMENT_VALIDATOR =
  55             SubstatementValidator.builder(YangStmtMapping.DEVIATE)
  56                 .addOptional(YangStmtMapping.CONFIG)
  57                 .addOptional(YangStmtMapping.DEFAULT)
  58                 .addOptional(YangStmtMapping.MANDATORY)
  59                 .addOptional(YangStmtMapping.MAX_ELEMENTS)
  60                 .addOptional(YangStmtMapping.MIN_ELEMENTS)
  61                 .addAny(YangStmtMapping.MUST)
  62                 .addAny(YangStmtMapping.UNIQUE)
  63                 .addOptional(YangStmtMapping.UNITS)
  64                 .build();
  65
  66     private static final SubstatementValidator DEVIATE_REPLACE_SUBSTATEMENT_VALIDATOR =
  67             SubstatementValidator.builder(YangStmtMapping.DEVIATE)
  68                 .addOptional(YangStmtMapping.CONFIG)
  69                 .addOptional(YangStmtMapping.DEFAULT)
  70                 .addOptional(YangStmtMapping.MANDATORY)
  71                 .addOptional(YangStmtMapping.MAX_ELEMENTS)
  72                 .addOptional(YangStmtMapping.MIN_ELEMENTS)
  73                 .addOptional(YangStmtMapping.TYPE)
  74                 .addOptional(YangStmtMapping.UNITS)
  75                 .build();
  76
  77     private static final SubstatementValidator DEVIATE_DELETE_SUBSTATEMENT_VALIDATOR =
  78             SubstatementValidator.builder(YangStmtMapping.DEVIATE)
  79                 .addOptional(YangStmtMapping.DEFAULT)
  80                 .addAny(YangStmtMapping.MUST)
  81                 .addAny(YangStmtMapping.UNIQUE)
  82                 .addOptional(YangStmtMapping.UNITS)
  83                 .build();
  84
  85     protected DeviateStatementImpl(final StmtContext<DeviateKind, DeviateStatement, ?> context) {
  86         super(context);
  87     }
  88
  89     public static class Definition extends AbstractStatementSupport<DeviateKind, DeviateStatement,
  90             EffectiveStatement<DeviateKind, DeviateStatement>> {
  91         private static final Map<String, DeviateKind> KEYWORD_TO_DEVIATE_MAP;
  92
  93         static {
  94             final Builder<String, DeviateKind> keywordToDeviateMapBuilder = ImmutableMap.builder();
  95             for (final DeviateKind deviate : DeviateKind.values()) {
  96                 keywordToDeviateMapBuilder.put(deviate.getKeyword(), deviate);
  97             }
  98             KEYWORD_TO_DEVIATE_MAP = keywordToDeviateMapBuilder.build();
  99         }
 100
 101         private static final Set<YangStmtMapping> SINGLETON_STATEMENTS = ImmutableSet.of(
 102                 YangStmtMapping.UNITS, YangStmtMapping.CONFIG, YangStmtMapping.MANDATORY,
 103                 YangStmtMapping.MIN_ELEMENTS, YangStmtMapping.MAX_ELEMENTS);
 104
 105         public Definition() {
 106             super(YangStmtMapping.DEVIATE);
 107         }
 108
 109         @Override
 110         public DeviateKind parseArgumentValue(final StmtContext<?, ?, ?> ctx, final String value) {
 111             return SourceException.throwIfNull(KEYWORD_TO_DEVIATE_MAP.get(value),
 112                 ctx.getStatementSourceReference(), "String '%s' is not valid deviate argument", value);
 113         }
 114
 115         @Override
 116         public DeviateStatement createDeclared(final StmtContext<DeviateKind, DeviateStatement, ?> ctx) {
 117             return new DeviateStatementImpl(ctx);
 118         }
 119
 120         @Override
 121         public EffectiveStatement<DeviateKind, DeviateStatement> createEffective(
 122                 final StmtContext<DeviateKind, DeviateStatement, EffectiveStatement<DeviateKind,
 123                         DeviateStatement>> ctx) {
 124             return new DeviateEffectiveStatementImpl(ctx);
 125         }
 126
 127         @Override
 128         public void onFullDefinitionDeclared(final Mutable<DeviateKind, DeviateStatement,
 129                 EffectiveStatement<DeviateKind, DeviateStatement>> deviateStmtCtx) {
 130             final DeviateKind deviateKind = deviateStmtCtx.getStatementArgument();
 131             getSubstatementValidatorForDeviate(deviateKind).validate(deviateStmtCtx);
 132
 133             final SchemaNodeIdentifier deviationTarget =
 134                     (SchemaNodeIdentifier) deviateStmtCtx.getParentContext().getStatementArgument();
 135
 136             if (!isDeviationSupported(deviateStmtCtx, deviationTarget)) {
 137                 return;
 138             }
 139
 140             final ModelActionBuilder deviateAction = deviateStmtCtx.newInferenceAction(
 141                     ModelProcessingPhase.EFFECTIVE_MODEL);
 142
 143             final Prerequisite<StmtContext<DeviateKind, DeviateStatement, EffectiveStatement<DeviateKind,
 144                     DeviateStatement>>> sourceCtxPrerequisite =
 145                     deviateAction.requiresCtx(deviateStmtCtx, ModelProcessingPhase.EFFECTIVE_MODEL);
 146
 147             final Prerequisite<Mutable<?, ?, EffectiveStatement<?, ?>>> targetCtxPrerequisite =
 148                     deviateAction.mutatesEffectiveCtx(deviateStmtCtx.getRoot(),
 149                         SchemaNodeIdentifierBuildNamespace.class,  deviationTarget);
 150
 151             deviateAction.apply(new InferenceAction() {
 152                 @Override
 153                 public void apply(final InferenceContext ctx) throws InferenceException {
 154                     // FIXME once BUG-7760 gets fixed, there will be no need for these dirty casts
 155                     final StatementContextBase<?, ?, ?> sourceNodeStmtCtx =
 156                             (StatementContextBase<?, ?, ?>) sourceCtxPrerequisite.resolve(ctx);
 157                     final StatementContextBase<?, ?, ?> targetNodeStmtCtx =
 158                             (StatementContextBase<?, ?, ?>) targetCtxPrerequisite.resolve(ctx);
 159
 160                     switch (deviateKind) {
 161                         case NOT_SUPPORTED:
 162                             targetNodeStmtCtx.setIsSupportedToBuildEffective(false);
 163                             break;
 164                         case ADD:
 165                             performDeviateAdd(sourceNodeStmtCtx, targetNodeStmtCtx);
 166                             break;
 167                         case REPLACE:
 168                             performDeviateReplace(sourceNodeStmtCtx, targetNodeStmtCtx);
 169                             break;
 170                         case DELETE:
 171                             performDeviateDelete(sourceNodeStmtCtx, targetNodeStmtCtx);
 172                             break;
 173                         default:
 174                             throw new IllegalStateException("Unsupported deviate " + deviateKind);
 175                     }
 176                 }
 177
 178                 @Override
 179                 public void prerequisiteFailed(final Collection<? extends Prerequisite<?>> failed) {
 180                     throw new InferenceException(deviateStmtCtx.getParentContext().getStatementSourceReference(),
 181                         "Deviation target '%s' not found.", deviationTarget);
 182                 }
 183             });
 184         }
 185
 186         private static boolean isDeviationSupported(final Mutable<DeviateKind, DeviateStatement,
 187                 EffectiveStatement<DeviateKind, DeviateStatement>> deviateStmtCtx,
 188                 final SchemaNodeIdentifier deviationTarget) {
 189             final Map<QNameModule, Set<QNameModule>> modulesDeviatedByModules = deviateStmtCtx.getFromNamespace(
 190                     ModulesDeviatedByModules.class, SupportedModules.SUPPORTED_MODULES);
 191             if (modulesDeviatedByModules == null) {
 192                 return true;
 193             }
 194
 195             final QNameModule currentModule = deviateStmtCtx.getFromNamespace(ModuleCtxToModuleQName.class,
 196                     deviateStmtCtx.getRoot());
 197             final QNameModule targetModule = deviationTarget.getLastComponent().getModule();
 198
 199             final Set<QNameModule> deviationModulesSupportedByTargetModule = modulesDeviatedByModules.get(targetModule);
 200             if (deviationModulesSupportedByTargetModule != null) {
 201                 return deviationModulesSupportedByTargetModule.contains(currentModule);
 202             }
 203
 204             return false;
 205         }
 206
 207         private static void performDeviateAdd(final StatementContextBase<?, ?, ?> deviateStmtCtx,
 208                 final StatementContextBase<?, ?, ?> targetCtx) {
 209             for (Mutable<?, ?, ?> originalStmtCtx : deviateStmtCtx.mutableDeclaredSubstatements()) {
 210                 validateDeviationTarget(originalStmtCtx, targetCtx);
 211                 addStatement(originalStmtCtx, targetCtx);
 212             }
 213         }
 214
 215         private static void addStatement(final Mutable<?, ?, ?> stmtCtxToBeAdded,
 216                 final StatementContextBase<?, ?, ?> targetCtx) {
 217             if (!StmtContextUtils.isUnknownStatement(stmtCtxToBeAdded)) {
 218                 final StatementDefinition stmtToBeAdded = stmtCtxToBeAdded.getPublicDefinition();
 219                 if (SINGLETON_STATEMENTS.contains(stmtToBeAdded) || YangStmtMapping.DEFAULT.equals(stmtToBeAdded)
 220                         && YangStmtMapping.LEAF.equals(targetCtx.getPublicDefinition())) {
 221                     for (final StmtContext<?, ?, ?> targetCtxSubstatement : targetCtx.allSubstatements()) {
 222                         InferenceException.throwIf(stmtToBeAdded.equals(targetCtxSubstatement.getPublicDefinition()),
 223                             stmtCtxToBeAdded.getStatementSourceReference(),
 224                             "Deviation cannot add substatement %s to target node %s because it is already defined "
 225                             + "in target and can appear only once.",
 226                             stmtToBeAdded.getStatementName(), targetCtx.getStatementArgument());
 227                     }
 228                 }
 229             }
 230
 231             targetCtx.addEffectiveSubstatement(targetCtx.childCopyOf(stmtCtxToBeAdded, CopyType.ORIGINAL));
 232         }
 233
 234         private static void performDeviateReplace(final StatementContextBase<?, ?, ?> deviateStmtCtx,
 235                 final StatementContextBase<?, ?, ?> targetCtx) {
 236             for (Mutable<?, ?, ?> originalStmtCtx : deviateStmtCtx.mutableDeclaredSubstatements()) {
 237                 validateDeviationTarget(originalStmtCtx, targetCtx);
 238                 replaceStatement(originalStmtCtx, targetCtx);
 239             }
 240         }
 241
 242         private static void replaceStatement(final Mutable<?, ?, ?> stmtCtxToBeReplaced,
 243                 final StatementContextBase<?, ?, ?> targetCtx) {
 244             final StatementDefinition stmtToBeReplaced = stmtCtxToBeReplaced.getPublicDefinition();
 245
 246             if (YangStmtMapping.DEFAULT.equals(stmtToBeReplaced)
 247                     && YangStmtMapping.LEAF_LIST.equals(targetCtx.getPublicDefinition())) {
 248                 LOG.error("Deviation cannot replace substatement {} in target leaf-list {} because a leaf-list can "
 249                         + "have multiple default statements. At line: {}", stmtToBeReplaced.getStatementName(),
 250                         targetCtx.getStatementArgument(), stmtCtxToBeReplaced.getStatementSourceReference());
 251                 return;
 252             }
 253
 254             for (final StmtContext<?, ?, ?> targetCtxSubstatement : targetCtx.effectiveSubstatements()) {
 255                 if (stmtToBeReplaced.equals(targetCtxSubstatement.getPublicDefinition())) {
 256                     targetCtx.removeStatementFromEffectiveSubstatements(stmtToBeReplaced);
 257                     targetCtx.addEffectiveSubstatement(targetCtx.childCopyOf(stmtCtxToBeReplaced, CopyType.ORIGINAL));
 258                     return;
 259                 }
 260             }
 261
 262             for (final Mutable<?, ?, ?> targetCtxSubstatement : targetCtx.mutableDeclaredSubstatements()) {
 263                 if (stmtToBeReplaced.equals(targetCtxSubstatement.getPublicDefinition())) {
 264                     targetCtxSubstatement.setIsSupportedToBuildEffective(false);
 265                     targetCtx.addEffectiveSubstatement(targetCtx.childCopyOf(stmtCtxToBeReplaced, CopyType.ORIGINAL));
 266                     return;
 267                 }
 268             }
 269
 270             throw new InferenceException(stmtCtxToBeReplaced.getStatementSourceReference(), "Deviation cannot replace "
 271                     + "substatement %s in target node %s because it does not exist in target node.",
 272                     stmtToBeReplaced.getStatementName(), targetCtx.getStatementArgument());
 273         }
 274
 275         private static void performDeviateDelete(final StatementContextBase<?, ?, ?> deviateStmtCtx,
 276                 final StatementContextBase<?, ?, ?> targetCtx) {
 277             for (Mutable<?, ?, ?> originalStmtCtx : deviateStmtCtx.mutableDeclaredSubstatements()) {
 278                 validateDeviationTarget(originalStmtCtx, targetCtx);
 279                 deleteStatement(originalStmtCtx, targetCtx);
 280             }
 281         }
 282
 283         private static void deleteStatement(final StmtContext<?, ?, ?> stmtCtxToBeDeleted,
 284                 final StatementContextBase<?, ?, ?> targetCtx) {
 285             final StatementDefinition stmtToBeDeleted = stmtCtxToBeDeleted.getPublicDefinition();
 286             final String stmtArgument = stmtCtxToBeDeleted.rawStatementArgument();
 287
 288             for (final Mutable<?, ?, ?> targetCtxSubstatement : targetCtx.mutableEffectiveSubstatements()) {
 289                 if (statementsAreEqual(stmtToBeDeleted, stmtArgument, targetCtxSubstatement.getPublicDefinition(),
 290                         targetCtxSubstatement.rawStatementArgument())) {
 291                     targetCtx.removeStatementFromEffectiveSubstatements(stmtToBeDeleted, stmtArgument);
 292                     return;
 293                 }
 294             }
 295
 296             for (final Mutable<?, ?, ?> targetCtxSubstatement : targetCtx.mutableDeclaredSubstatements()) {
 297                 if (statementsAreEqual(stmtToBeDeleted, stmtArgument, targetCtxSubstatement.getPublicDefinition(),
 298                         targetCtxSubstatement.rawStatementArgument())) {
 299                     targetCtxSubstatement.setIsSupportedToBuildEffective(false);
 300                     return;
 301                 }
 302             }
 303
 304             LOG.error("Deviation cannot delete substatement {} with argument '{}' in target node {} because it does "
 305                     + "not exist in the target node. At line: {}", stmtToBeDeleted.getStatementName(), stmtArgument,
 306                     targetCtx.getStatementArgument(), stmtCtxToBeDeleted.getStatementSourceReference());
 307         }
 308
 309         private static boolean statementsAreEqual(final StatementDefinition firstStmtDef, final String firstStmtArg,
 310                 final StatementDefinition secondStmtDef, final String secondStmtArg) {
 311             return firstStmtDef.equals(secondStmtDef) && Objects.equals(firstStmtArg, secondStmtArg);
 312         }
 313
 314         private static void validateDeviationTarget(final StmtContext<?, ?, ?> deviateSubStmtCtx,
 315                 final StmtContext<?, ?, ?> targetCtx) {
 316             InferenceException.throwIf(!isSupportedDeviationTarget(deviateSubStmtCtx, targetCtx,
 317                     targetCtx.getRootVersion()), deviateSubStmtCtx.getStatementSourceReference(),
 318                     "%s is not a valid deviation target for substatement %s.",
 319                     targetCtx.getStatementArgument(), deviateSubStmtCtx.getPublicDefinition().getStatementName());
 320         }
 321
 322         private static boolean isSupportedDeviationTarget(final StmtContext<?, ?, ?> deviateSubstatementCtx,
 323                 final StmtContext<?, ?, ?> deviateTargetCtx, final YangVersion yangVersion) {
 324             Set<StatementDefinition> supportedDeviationTargets =
 325                     YangValidationBundles.SUPPORTED_DEVIATION_TARGETS.get(deviateTargetCtx.getRootVersion(),
 326                             deviateSubstatementCtx.getPublicDefinition());
 327
 328             if (supportedDeviationTargets == null) {
 329                 supportedDeviationTargets = YangValidationBundles.SUPPORTED_DEVIATION_TARGETS.get(YangVersion.VERSION_1,
 330                         deviateSubstatementCtx.getPublicDefinition());
 331             }
 332
 333             // if supportedDeviationTargets is null, it means that the deviate substatement is an unknown statement
 334             return supportedDeviationTargets == null || supportedDeviationTargets.contains(
 335                     deviateTargetCtx.getPublicDefinition());
 336         }
 337
 338         protected SubstatementValidator getSubstatementValidatorForDeviate(final DeviateKind deviateKind) {
 339             switch (deviateKind) {
 340                 case NOT_SUPPORTED:
 341                     return DEVIATE_NOT_SUPPORTED_SUBSTATEMENT_VALIDATOR;
 342                 case ADD:
 343                     return DEVIATE_ADD_SUBSTATEMENT_VALIDATOR;
 344                 case REPLACE:
 345                     return DEVIATE_REPLACE_SUBSTATEMENT_VALIDATOR;
 346                 case DELETE:
 347                     return DEVIATE_DELETE_SUBSTATEMENT_VALIDATOR;
 348                 default:
 349                     throw new IllegalStateException(String.format(
 350                             "Substatement validator for deviate %s has not been defined.", deviateKind));
 351             }
 352         }
 353
 354         @Override
 355         protected SubstatementValidator getSubstatementValidator() {
 356             return null;
 357         }
 358     }
 359
 360     @Nonnull
 361     @Override
 362     public DeviateKind getValue() {
 363         return argument();
 364     }
 365 }