yang/yang-parser-rfc7950/src/main/java/org/opendaylight/yangtools/yang/parser/rfc7950/stmt/deviate/AbstractDeviateStatementSupport.java

   1 /*
   2  * Copyright (c) 2017 Pantheon Technologies, s.r.o. 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.rfc7950.stmt.deviate;
   9
  10 import com.google.common.collect.ImmutableList;
  11 import com.google.common.collect.ImmutableMap;
  12 import com.google.common.collect.ImmutableSet;
  13 import com.google.common.collect.Iterables;
  14 import com.google.common.collect.Maps;
  15 import com.google.common.collect.SetMultimap;
  16 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
  17 import java.util.Arrays;
  18 import java.util.Collection;
  19 import java.util.Objects;
  20 import java.util.Set;
  21 import org.opendaylight.yangtools.yang.common.QNameModule;
  22 import org.opendaylight.yangtools.yang.common.YangVersion;
  23 import org.opendaylight.yangtools.yang.model.api.DeviateKind;
  24 import org.opendaylight.yangtools.yang.model.api.YangStmtMapping;
  25 import org.opendaylight.yangtools.yang.model.api.meta.DeclaredStatement;
  26 import org.opendaylight.yangtools.yang.model.api.meta.EffectiveStatement;
  27 import org.opendaylight.yangtools.yang.model.api.meta.StatementDefinition;
  28 import org.opendaylight.yangtools.yang.model.api.stmt.DeviateEffectiveStatement;
  29 import org.opendaylight.yangtools.yang.model.api.stmt.DeviateStatement;
  30 import org.opendaylight.yangtools.yang.model.api.stmt.SchemaNodeIdentifier;
  31 import org.opendaylight.yangtools.yang.model.spi.stmt.DeclaredStatements;
  32 import org.opendaylight.yangtools.yang.parser.rfc7950.reactor.YangValidationBundles;
  33 import org.opendaylight.yangtools.yang.parser.spi.SchemaTreeNamespace;
  34 import org.opendaylight.yangtools.yang.parser.spi.meta.AbstractStatementSupport;
  35 import org.opendaylight.yangtools.yang.parser.spi.meta.CopyType;
  36 import org.opendaylight.yangtools.yang.parser.spi.meta.EffectiveStmtCtx.Current;
  37 import org.opendaylight.yangtools.yang.parser.spi.meta.InferenceException;
  38 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelActionBuilder;
  39 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelActionBuilder.InferenceAction;
  40 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelActionBuilder.InferenceContext;
  41 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelActionBuilder.Prerequisite;
  42 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelProcessingPhase;
  43 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;
  44 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext.Mutable;
  45 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContextUtils;
  46 import org.opendaylight.yangtools.yang.parser.spi.meta.SubstatementValidator;
  47 import org.opendaylight.yangtools.yang.parser.spi.source.ModuleCtxToModuleQName;
  48 import org.opendaylight.yangtools.yang.parser.spi.source.ModulesDeviatedByModules;
  49 import org.opendaylight.yangtools.yang.parser.spi.source.ModulesDeviatedByModules.SupportedModules;
  50 import org.opendaylight.yangtools.yang.parser.spi.source.SourceException;
  51 import org.opendaylight.yangtools.yang.parser.stmt.reactor.StatementContextBase;
  52 import org.slf4j.Logger;
  53 import org.slf4j.LoggerFactory;
  54
  55 abstract class AbstractDeviateStatementSupport
  56         extends AbstractStatementSupport<DeviateKind, DeviateStatement, DeviateEffectiveStatement> {
  57     private static final Logger LOG = LoggerFactory.getLogger(AbstractDeviateStatementSupport.class);
  58
  59     private static final SubstatementValidator DEVIATE_NOT_SUPPORTED_SUBSTATEMENT_VALIDATOR =
  60             SubstatementValidator.builder(YangStmtMapping.DEVIATE).build();
  61
  62     private static final SubstatementValidator DEVIATE_ADD_SUBSTATEMENT_VALIDATOR =
  63             SubstatementValidator.builder(YangStmtMapping.DEVIATE)
  64                 .addOptional(YangStmtMapping.CONFIG)
  65                 .addOptional(YangStmtMapping.DEFAULT)
  66                 .addOptional(YangStmtMapping.MANDATORY)
  67                 .addOptional(YangStmtMapping.MAX_ELEMENTS)
  68                 .addOptional(YangStmtMapping.MIN_ELEMENTS)
  69                 .addAny(YangStmtMapping.MUST)
  70                 .addAny(YangStmtMapping.UNIQUE)
  71                 .addOptional(YangStmtMapping.UNITS)
  72                 .build();
  73
  74     private static final SubstatementValidator DEVIATE_REPLACE_SUBSTATEMENT_VALIDATOR =
  75             SubstatementValidator.builder(YangStmtMapping.DEVIATE)
  76                 .addOptional(YangStmtMapping.CONFIG)
  77                 .addOptional(YangStmtMapping.DEFAULT)
  78                 .addOptional(YangStmtMapping.MANDATORY)
  79                 .addOptional(YangStmtMapping.MAX_ELEMENTS)
  80                 .addOptional(YangStmtMapping.MIN_ELEMENTS)
  81                 .addOptional(YangStmtMapping.TYPE)
  82                 .addOptional(YangStmtMapping.UNITS)
  83                 .build();
  84
  85     private static final SubstatementValidator DEVIATE_DELETE_SUBSTATEMENT_VALIDATOR =
  86             SubstatementValidator.builder(YangStmtMapping.DEVIATE)
  87                 .addOptional(YangStmtMapping.DEFAULT)
  88                 .addAny(YangStmtMapping.MUST)
  89                 .addAny(YangStmtMapping.UNIQUE)
  90                 .addOptional(YangStmtMapping.UNITS)
  91                 .build();
  92
  93     private static final ImmutableMap<String, DeviateKind> KEYWORD_TO_DEVIATE_MAP =
  94             Maps.uniqueIndex(Arrays.asList(DeviateKind.values()), DeviateKind::getKeyword);
  95
  96     private static final ImmutableSet<YangStmtMapping> SINGLETON_STATEMENTS = ImmutableSet.of(
  97             YangStmtMapping.UNITS, YangStmtMapping.CONFIG, YangStmtMapping.MANDATORY,
  98             YangStmtMapping.MIN_ELEMENTS, YangStmtMapping.MAX_ELEMENTS);
  99
 100     private static final ImmutableSet<YangStmtMapping> IMPLICIT_STATEMENTS = ImmutableSet.of(YangStmtMapping.CONFIG,
 101             YangStmtMapping.MANDATORY, YangStmtMapping.MAX_ELEMENTS, YangStmtMapping.MIN_ELEMENTS);
 102
 103     AbstractDeviateStatementSupport() {
 104         super(YangStmtMapping.DEVIATE, StatementPolicy.contextIndependent());
 105     }
 106
 107     @Override
 108     public final DeviateKind parseArgumentValue(final StmtContext<?, ?, ?> ctx, final String value) {
 109         return SourceException.throwIfNull(KEYWORD_TO_DEVIATE_MAP.get(value), ctx,
 110             "String '%s' is not valid deviate argument", value);
 111     }
 112
 113     @Override
 114     public final void onFullDefinitionDeclared(
 115             final Mutable<DeviateKind, DeviateStatement, DeviateEffectiveStatement> deviateStmtCtx) {
 116         final DeviateKind deviateKind = deviateStmtCtx.argument();
 117         getSubstatementValidatorForDeviate(deviateKind).validate(deviateStmtCtx);
 118
 119         final SchemaNodeIdentifier deviationTarget =
 120                 (SchemaNodeIdentifier) deviateStmtCtx.coerceParentContext().argument();
 121
 122         if (!isDeviationSupported(deviateStmtCtx, deviationTarget)) {
 123             return;
 124         }
 125
 126         final ModelActionBuilder deviateAction = deviateStmtCtx.newInferenceAction(
 127                 ModelProcessingPhase.EFFECTIVE_MODEL);
 128
 129         final Prerequisite<StmtContext<DeviateKind, DeviateStatement,
 130             DeviateEffectiveStatement>> sourceCtxPrerequisite =
 131                 deviateAction.requiresCtx(deviateStmtCtx, ModelProcessingPhase.EFFECTIVE_MODEL);
 132
 133         final Prerequisite<Mutable<?, ?, EffectiveStatement<?, ?>>> targetCtxPrerequisite =
 134                 deviateAction.mutatesEffectiveCtxPath(deviateStmtCtx.getRoot(),
 135                     SchemaTreeNamespace.class, deviationTarget.getNodeIdentifiers());
 136
 137         deviateAction.apply(new InferenceAction() {
 138             @Override
 139             public void apply(final InferenceContext ctx) {
 140                 // FIXME once BUG-7760 gets fixed, there will be no need for these dirty casts
 141                 final StatementContextBase<?, ?, ?> sourceNodeStmtCtx =
 142                         (StatementContextBase<?, ?, ?>) sourceCtxPrerequisite.resolve(ctx);
 143                 final StatementContextBase<?, ?, ?> targetNodeStmtCtx =
 144                         (StatementContextBase<?, ?, ?>) targetCtxPrerequisite.resolve(ctx);
 145
 146                 switch (deviateKind) {
 147                     case NOT_SUPPORTED:
 148                         targetNodeStmtCtx.setIsSupportedToBuildEffective(false);
 149                         break;
 150                     case ADD:
 151                         performDeviateAdd(sourceNodeStmtCtx, targetNodeStmtCtx);
 152                         break;
 153                     case REPLACE:
 154                         performDeviateReplace(sourceNodeStmtCtx, targetNodeStmtCtx);
 155                         break;
 156                     case DELETE:
 157                         performDeviateDelete(sourceNodeStmtCtx, targetNodeStmtCtx);
 158                         break;
 159                     default:
 160                         throw new IllegalStateException("Unsupported deviate " + deviateKind);
 161                 }
 162             }
 163
 164             @Override
 165             public void prerequisiteFailed(final Collection<? extends Prerequisite<?>> failed) {
 166                 throw new InferenceException(deviateStmtCtx.coerceParentContext(), "Deviation target '%s' not found.",
 167                     deviationTarget);
 168             }
 169         });
 170     }
 171
 172     @Override
 173     public String internArgument(final String rawArgument) {
 174         if ("add".equals(rawArgument)) {
 175             return "add";
 176         } else if ("delete".equals(rawArgument)) {
 177             return "delete";
 178         } else if ("replace".equals(rawArgument)) {
 179             return "replace";
 180         } else if ("not-supported".equals(rawArgument)) {
 181             return "not-supported";
 182         } else {
 183             return rawArgument;
 184         }
 185     }
 186
 187     @Override
 188     protected final SubstatementValidator getSubstatementValidator() {
 189         return null;
 190     }
 191
 192     @Override
 193     protected final DeviateStatement createDeclared(final StmtContext<DeviateKind, DeviateStatement, ?> ctx,
 194             final ImmutableList<? extends DeclaredStatement<?>> substatements) {
 195         return DeclaredStatements.createDeviate(ctx.getArgument(), substatements);
 196     }
 197
 198     @Override
 199     protected final DeviateStatement createEmptyDeclared(final StmtContext<DeviateKind, DeviateStatement, ?> ctx) {
 200         return DeclaredStatements.createDeviate(ctx.getArgument());
 201     }
 202
 203     @Override
 204     protected DeviateEffectiveStatement createEffective(final Current<DeviateKind, DeviateStatement> stmt,
 205             final ImmutableList<? extends EffectiveStatement<?, ?>> substatements) {
 206         return new DeviateEffectiveStatementImpl(stmt.declared(), substatements);
 207     }
 208
 209     protected SubstatementValidator getSubstatementValidatorForDeviate(final DeviateKind deviateKind) {
 210         switch (deviateKind) {
 211             case NOT_SUPPORTED:
 212                 return DEVIATE_NOT_SUPPORTED_SUBSTATEMENT_VALIDATOR;
 213             case ADD:
 214                 return DEVIATE_ADD_SUBSTATEMENT_VALIDATOR;
 215             case REPLACE:
 216                 return DEVIATE_REPLACE_SUBSTATEMENT_VALIDATOR;
 217             case DELETE:
 218                 return DEVIATE_DELETE_SUBSTATEMENT_VALIDATOR;
 219             default:
 220                 throw new IllegalStateException(String.format(
 221                         "Substatement validator for deviate %s has not been defined.", deviateKind));
 222         }
 223     }
 224
 225     private static boolean isDeviationSupported(
 226             final Mutable<DeviateKind, DeviateStatement, DeviateEffectiveStatement> deviateStmtCtx,
 227             final SchemaNodeIdentifier deviationTarget) {
 228         final SetMultimap<QNameModule, QNameModule> modulesDeviatedByModules = deviateStmtCtx.getFromNamespace(
 229                 ModulesDeviatedByModules.class, SupportedModules.SUPPORTED_MODULES);
 230         if (modulesDeviatedByModules == null) {
 231             return true;
 232         }
 233
 234         final QNameModule currentModule = deviateStmtCtx.getFromNamespace(ModuleCtxToModuleQName.class,
 235                 deviateStmtCtx.getRoot());
 236         final QNameModule targetModule = Iterables.getLast(deviationTarget.getNodeIdentifiers()).getModule();
 237
 238         final Set<QNameModule> deviationModulesSupportedByTargetModule = modulesDeviatedByModules.get(targetModule);
 239         if (deviationModulesSupportedByTargetModule != null) {
 240             return deviationModulesSupportedByTargetModule.contains(currentModule);
 241         }
 242
 243         return false;
 244     }
 245
 246     @SuppressFBWarnings(value = "UPM_UNCALLED_PRIVATE_METHOD",
 247             justification = "https://github.com/spotbugs/spotbugs/issues/811")
 248     private static void performDeviateAdd(final StatementContextBase<?, ?, ?> deviateStmtCtx,
 249             final StatementContextBase<?, ?, ?> targetCtx) {
 250         for (Mutable<?, ?, ?> originalStmtCtx : deviateStmtCtx.mutableDeclaredSubstatements()) {
 251             validateDeviationTarget(originalStmtCtx, targetCtx);
 252             addStatement(originalStmtCtx, targetCtx);
 253         }
 254     }
 255
 256     private static void addStatement(final Mutable<?, ?, ?> stmtCtxToBeAdded,
 257             final StatementContextBase<?, ?, ?> targetCtx) {
 258         if (!StmtContextUtils.isUnknownStatement(stmtCtxToBeAdded)) {
 259             final StatementDefinition stmtToBeAdded = stmtCtxToBeAdded.publicDefinition();
 260             if (SINGLETON_STATEMENTS.contains(stmtToBeAdded) || YangStmtMapping.DEFAULT.equals(stmtToBeAdded)
 261                     && YangStmtMapping.LEAF.equals(targetCtx.publicDefinition())) {
 262                 for (final StmtContext<?, ?, ?> targetCtxSubstatement : targetCtx.allSubstatements()) {
 263                     InferenceException.throwIf(stmtToBeAdded.equals(targetCtxSubstatement.publicDefinition()),
 264                         stmtCtxToBeAdded,
 265                         "Deviation cannot add substatement %s to target node %s because it is already defined "
 266                         + "in target and can appear only once.",
 267                         stmtToBeAdded.getStatementName(), targetCtx.argument());
 268                 }
 269             }
 270         }
 271
 272         copyStatement(stmtCtxToBeAdded, targetCtx);
 273     }
 274
 275     @SuppressFBWarnings(value = "UPM_UNCALLED_PRIVATE_METHOD",
 276             justification = "https://github.com/spotbugs/spotbugs/issues/811")
 277     private static void performDeviateReplace(final StatementContextBase<?, ?, ?> deviateStmtCtx,
 278             final StatementContextBase<?, ?, ?> targetCtx) {
 279         for (Mutable<?, ?, ?> originalStmtCtx : deviateStmtCtx.mutableDeclaredSubstatements()) {
 280             validateDeviationTarget(originalStmtCtx, targetCtx);
 281             replaceStatement(originalStmtCtx, targetCtx);
 282         }
 283     }
 284
 285     private static void replaceStatement(final Mutable<?, ?, ?> stmtCtxToBeReplaced,
 286             final StatementContextBase<?, ?, ?> targetCtx) {
 287         final StatementDefinition stmtToBeReplaced = stmtCtxToBeReplaced.publicDefinition();
 288
 289         if (YangStmtMapping.DEFAULT.equals(stmtToBeReplaced)
 290                 && YangStmtMapping.LEAF_LIST.equals(targetCtx.publicDefinition())) {
 291             LOG.error("Deviation cannot replace substatement {} in target leaf-list {} because a leaf-list can "
 292                     + "have multiple default statements. At line: {}", stmtToBeReplaced.getStatementName(),
 293                     targetCtx.argument(), stmtCtxToBeReplaced.sourceReference());
 294             return;
 295         }
 296
 297         for (final StmtContext<?, ?, ?> targetCtxSubstatement : targetCtx.effectiveSubstatements()) {
 298             if (stmtToBeReplaced.equals(targetCtxSubstatement.publicDefinition())) {
 299                 targetCtx.removeStatementFromEffectiveSubstatements(stmtToBeReplaced);
 300                 copyStatement(stmtCtxToBeReplaced, targetCtx);
 301                 return;
 302             }
 303         }
 304
 305         for (final Mutable<?, ?, ?> targetCtxSubstatement : targetCtx.mutableDeclaredSubstatements()) {
 306             if (stmtToBeReplaced.equals(targetCtxSubstatement.publicDefinition())) {
 307                 targetCtxSubstatement.setIsSupportedToBuildEffective(false);
 308                 copyStatement(stmtCtxToBeReplaced, targetCtx);
 309                 return;
 310             }
 311         }
 312
 313         // This is a special case when deviate replace of a config/mandatory/max/min-elements substatement targets
 314         // a node which does not contain an explicitly declared config/mandatory/max/min-elements.
 315         // However, according to RFC6020/RFC7950, these properties are always implicitly present.
 316         if (IMPLICIT_STATEMENTS.contains(stmtToBeReplaced)) {
 317             addStatement(stmtCtxToBeReplaced, targetCtx);
 318             return;
 319         }
 320
 321         throw new InferenceException(stmtCtxToBeReplaced,
 322             "Deviation cannot replace substatement %s in target node %s because it does not exist in target node.",
 323             stmtToBeReplaced.getStatementName(), targetCtx.argument());
 324     }
 325
 326     @SuppressFBWarnings(value = "UPM_UNCALLED_PRIVATE_METHOD",
 327             justification = "https://github.com/spotbugs/spotbugs/issues/811")
 328     private static void performDeviateDelete(final StatementContextBase<?, ?, ?> deviateStmtCtx,
 329             final StatementContextBase<?, ?, ?> targetCtx) {
 330         for (Mutable<?, ?, ?> originalStmtCtx : deviateStmtCtx.mutableDeclaredSubstatements()) {
 331             validateDeviationTarget(originalStmtCtx, targetCtx);
 332             deleteStatement(originalStmtCtx, targetCtx);
 333         }
 334     }
 335
 336     private static void deleteStatement(final StmtContext<?, ?, ?> stmtCtxToBeDeleted,
 337             final StatementContextBase<?, ?, ?> targetCtx) {
 338         final StatementDefinition stmtToBeDeleted = stmtCtxToBeDeleted.publicDefinition();
 339         final String stmtArgument = stmtCtxToBeDeleted.rawArgument();
 340
 341         for (final Mutable<?, ?, ?> targetCtxSubstatement : targetCtx.mutableEffectiveSubstatements()) {
 342             if (statementsAreEqual(stmtToBeDeleted, stmtArgument, targetCtxSubstatement.publicDefinition(),
 343                     targetCtxSubstatement.rawArgument())) {
 344                 targetCtx.removeStatementFromEffectiveSubstatements(stmtToBeDeleted, stmtArgument);
 345                 return;
 346             }
 347         }
 348
 349         for (final Mutable<?, ?, ?> targetCtxSubstatement : targetCtx.mutableDeclaredSubstatements()) {
 350             if (statementsAreEqual(stmtToBeDeleted, stmtArgument, targetCtxSubstatement.publicDefinition(),
 351                     targetCtxSubstatement.rawArgument())) {
 352                 targetCtxSubstatement.setIsSupportedToBuildEffective(false);
 353                 return;
 354             }
 355         }
 356
 357         LOG.error("Deviation cannot delete substatement {} with argument '{}' in target node {} because it does "
 358                 + "not exist in the target node. At line: {}", stmtToBeDeleted.getStatementName(), stmtArgument,
 359                 targetCtx.argument(), stmtCtxToBeDeleted.sourceReference());
 360     }
 361
 362     private static void copyStatement(final Mutable<?, ?, ?> stmtCtxToBeCopied,
 363             final StatementContextBase<?, ?, ?> targetCtx) {
 364         // we need to make a copy of the statement context only if it is an unknown statement, otherwise
 365         // we can reuse the original statement context
 366         if (!StmtContextUtils.isUnknownStatement(stmtCtxToBeCopied)) {
 367             targetCtx.addEffectiveSubstatement(stmtCtxToBeCopied.replicaAsChildOf(targetCtx));
 368         } else {
 369             targetCtx.addEffectiveSubstatement(targetCtx.childCopyOf(stmtCtxToBeCopied, CopyType.ORIGINAL));
 370         }
 371     }
 372
 373     private static boolean statementsAreEqual(final StatementDefinition firstStmtDef, final String firstStmtArg,
 374             final StatementDefinition secondStmtDef, final String secondStmtArg) {
 375         return firstStmtDef.equals(secondStmtDef) && Objects.equals(firstStmtArg, secondStmtArg);
 376     }
 377
 378     private static void validateDeviationTarget(final StmtContext<?, ?, ?> deviateSubStmtCtx,
 379             final StmtContext<?, ?, ?> targetCtx) {
 380         InferenceException.throwIf(!isSupportedDeviationTarget(deviateSubStmtCtx, targetCtx,
 381             targetCtx.yangVersion()), deviateSubStmtCtx,
 382             "%s is not a valid deviation target for substatement %s.", targetCtx.argument(),
 383             deviateSubStmtCtx.publicDefinition().getStatementName());
 384     }
 385
 386     private static boolean isSupportedDeviationTarget(final StmtContext<?, ?, ?> deviateSubstatementCtx,
 387             final StmtContext<?, ?, ?> deviateTargetCtx, final YangVersion yangVersion) {
 388         Set<StatementDefinition> supportedDeviationTargets =
 389                 YangValidationBundles.SUPPORTED_DEVIATION_TARGETS.get(yangVersion,
 390                         deviateSubstatementCtx.publicDefinition());
 391
 392         if (supportedDeviationTargets == null) {
 393             supportedDeviationTargets = YangValidationBundles.SUPPORTED_DEVIATION_TARGETS.get(YangVersion.VERSION_1,
 394                     deviateSubstatementCtx.publicDefinition());
 395         }
 396
 397         // if supportedDeviationTargets is null, it means that the deviate substatement is an unknown statement
 398         return supportedDeviationTargets == null || supportedDeviationTargets.contains(
 399                 deviateTargetCtx.publicDefinition());
 400     }
 401 }