yang/yang-data-impl/src/main/java/org/opendaylight/yangtools/yang/data/impl/schema/tree/SchemaAwareApplyOperation.java

   1 /*
   2  * Copyright (c) 2014 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.data.impl.schema.tree;
   9
  10 import com.google.common.base.Optional;
  11 import com.google.common.base.Preconditions;
  12 import java.util.List;
  13 import org.opendaylight.yangtools.yang.common.QName;
  14 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  15 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.AugmentationIdentifier;
  16 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
  17 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  18 import org.opendaylight.yangtools.yang.data.api.schema.tree.ConflictingModificationAppliedException;
  19 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataValidationFailedException;
  20 import org.opendaylight.yangtools.yang.data.api.schema.tree.IncorrectDataStructureException;
  21 import org.opendaylight.yangtools.yang.data.api.schema.tree.ModificationType;
  22 import org.opendaylight.yangtools.yang.data.api.schema.tree.spi.TreeNode;
  23 import org.opendaylight.yangtools.yang.data.api.schema.tree.spi.Version;
  24 import org.opendaylight.yangtools.yang.model.api.AugmentationSchema;
  25 import org.opendaylight.yangtools.yang.model.api.AugmentationTarget;
  26 import org.opendaylight.yangtools.yang.model.api.ChoiceSchemaNode;
  27 import org.opendaylight.yangtools.yang.model.api.ContainerSchemaNode;
  28 import org.opendaylight.yangtools.yang.model.api.DataNodeContainer;
  29 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
  30 import org.opendaylight.yangtools.yang.model.api.LeafListSchemaNode;
  31 import org.opendaylight.yangtools.yang.model.api.LeafSchemaNode;
  32 import org.opendaylight.yangtools.yang.model.api.ListSchemaNode;
  33 import org.slf4j.Logger;
  34 import org.slf4j.LoggerFactory;
  35
  36 abstract class SchemaAwareApplyOperation implements ModificationApplyOperation {
  37     private static final Logger LOG = LoggerFactory.getLogger(SchemaAwareApplyOperation.class);
  38
  39     public static SchemaAwareApplyOperation from(final DataSchemaNode schemaNode) {
  40         if (schemaNode instanceof ContainerSchemaNode) {
  41             return new DataNodeContainerModificationStrategy.ContainerModificationStrategy((ContainerSchemaNode) schemaNode);
  42         } else if (schemaNode instanceof ListSchemaNode) {
  43             return fromListSchemaNode((ListSchemaNode) schemaNode);
  44         } else if (schemaNode instanceof ChoiceSchemaNode) {
  45             return new NormalizedNodeContainerModificationStrategy.ChoiceModificationStrategy((ChoiceSchemaNode) schemaNode);
  46         } else if (schemaNode instanceof LeafListSchemaNode) {
  47             return fromLeafListSchemaNode((LeafListSchemaNode) schemaNode);
  48         } else if (schemaNode instanceof LeafSchemaNode) {
  49             return new ValueNodeModificationStrategy.LeafModificationStrategy((LeafSchemaNode) schemaNode);
  50         }
  51         throw new IllegalArgumentException("Not supported schema node type for " + schemaNode.getClass());
  52     }
  53
  54     public static SchemaAwareApplyOperation from(final DataNodeContainer resolvedTree,
  55             final AugmentationTarget augSchemas, final AugmentationIdentifier identifier) {
  56         for (AugmentationSchema potential : augSchemas.getAvailableAugmentations()) {
  57             for (DataSchemaNode child : potential.getChildNodes()) {
  58                 if (identifier.getPossibleChildNames().contains(child.getQName())) {
  59                     return new DataNodeContainerModificationStrategy.AugmentationModificationStrategy(potential, resolvedTree);
  60                 }
  61             }
  62         }
  63
  64         return null;
  65     }
  66
  67     public static boolean checkConflicting(final YangInstanceIdentifier path, final boolean condition, final String message) throws ConflictingModificationAppliedException {
  68         if(!condition) {
  69             throw new ConflictingModificationAppliedException(path, message);
  70         }
  71         return condition;
  72     }
  73
  74     private static SchemaAwareApplyOperation fromListSchemaNode(final ListSchemaNode schemaNode) {
  75         List<QName> keyDefinition = schemaNode.getKeyDefinition();
  76         if (keyDefinition == null || keyDefinition.isEmpty()) {
  77             return new UnkeyedListModificationStrategy(schemaNode);
  78         }
  79         if (schemaNode.isUserOrdered()) {
  80             return new NormalizedNodeContainerModificationStrategy.OrderedMapModificationStrategy(schemaNode);
  81         }
  82
  83         return new NormalizedNodeContainerModificationStrategy.UnorderedMapModificationStrategy(schemaNode);
  84     }
  85
  86     private static SchemaAwareApplyOperation fromLeafListSchemaNode(final LeafListSchemaNode schemaNode) {
  87         if(schemaNode.isUserOrdered()) {
  88             return new NormalizedNodeContainerModificationStrategy.OrderedLeafSetModificationStrategy(schemaNode);
  89         } else {
  90             return new NormalizedNodeContainerModificationStrategy.UnorderedLeafSetModificationStrategy(schemaNode);
  91         }
  92     }
  93
  94     private static final void checkNotConflicting(final YangInstanceIdentifier path, final TreeNode original, final TreeNode current) throws ConflictingModificationAppliedException {
  95         checkConflicting(path, original.getVersion().equals(current.getVersion()),
  96                 "Node was replaced by other transaction.");
  97         checkConflicting(path, original.getSubtreeVersion().equals(current.getSubtreeVersion()),
  98                 "Node children was modified by other transaction");
  99     }
 100
 101     protected final ModificationApplyOperation resolveChildOperation(final PathArgument child) {
 102         Optional<ModificationApplyOperation> potential = getChild(child);
 103         Preconditions.checkArgument(potential.isPresent(), "Operation for child %s is not defined.", child);
 104         return potential.get();
 105     }
 106
 107     @Override
 108     public void verifyStructure(final ModifiedNode modification) throws IllegalArgumentException {
 109         if (modification.getOperation() == LogicalOperation.WRITE) {
 110             verifyWrittenStructure(modification.getWrittenValue());
 111         }
 112     }
 113
 114     @Override
 115     public final void checkApplicable(final YangInstanceIdentifier path,final NodeModification modification, final Optional<TreeNode> current) throws DataValidationFailedException {
 116         switch (modification.getOperation()) {
 117         case DELETE:
 118             checkDeleteApplicable(modification, current);
 119         case TOUCH:
 120             checkSubtreeModificationApplicable(path, modification, current);
 121             return;
 122         case WRITE:
 123             checkWriteApplicable(path, modification, current);
 124             return;
 125         case MERGE:
 126             checkMergeApplicable(path, modification, current);
 127             return;
 128         case NONE:
 129             return;
 130         default:
 131             throw new UnsupportedOperationException("Suplied modification type "+ modification.getOperation()+ "is not supported.");
 132         }
 133
 134     }
 135
 136     protected void checkMergeApplicable(final YangInstanceIdentifier path, final NodeModification modification, final Optional<TreeNode> current) throws DataValidationFailedException {
 137         Optional<TreeNode> original = modification.getOriginal();
 138         if (original.isPresent() && current.isPresent()) {
 139             /*
 140              * We need to do conflict detection only and only if the value of leaf changed
 141              * before two transactions. If value of leaf is unchanged between two transactions
 142              * it should not cause transaction to fail, since result of this merge
 143              * leads to same data.
 144              */
 145             if(!original.get().getData().equals(current.get().getData())) {
 146                 checkNotConflicting(path, original.get(), current.get());
 147             }
 148         }
 149     }
 150
 151     /**
 152      * Checks if write operation can be applied to current TreeNode.
 153      * The operation checks if original tree node to which the modification is going to be applied exists and if
 154      * current node in TreeNode structure exists.
 155      *
 156      * @param path Path from current node in TreeNode
 157      * @param modification modification to apply
 158      * @param current current node in TreeNode for modification to apply
 159      * @throws DataValidationFailedException
 160      */
 161     protected void checkWriteApplicable(final YangInstanceIdentifier path, final NodeModification modification,
 162         final Optional<TreeNode> current) throws DataValidationFailedException {
 163         Optional<TreeNode> original = modification.getOriginal();
 164         if (original.isPresent() && current.isPresent()) {
 165             checkNotConflicting(path, original.get(), current.get());
 166         } else if(original.isPresent()) {
 167             throw new ConflictingModificationAppliedException(path,"Node was deleted by other transaction.");
 168         } else if(current.isPresent()) {
 169             throw new ConflictingModificationAppliedException(path,"Node was created by other transaction.");
 170         }
 171     }
 172
 173     private void checkDeleteApplicable(final NodeModification modification, final Optional<TreeNode> current) {
 174         // Delete is always applicable, we do not expose it to subclasses
 175         if (current.isPresent()) {
 176             LOG.trace("Delete operation turned to no-op on missing node {}", modification);
 177         }
 178     }
 179
 180     boolean isOrdered() {
 181         return false;
 182     }
 183
 184     @Override
 185     public final Optional<TreeNode> apply(final ModifiedNode modification,
 186             final Optional<TreeNode> currentMeta, final Version version) {
 187
 188         switch (modification.getOperation()) {
 189         case DELETE:
 190             modification.resolveModificationType(ModificationType.DELETE);
 191             return modification.setSnapshot(Optional.<TreeNode> absent());
 192         case TOUCH:
 193             Preconditions.checkArgument(currentMeta.isPresent(), "Metadata not available for modification",
 194                     modification);
 195             modification.resolveModificationType(ModificationType.SUBTREE_MODIFIED);
 196             return modification.setSnapshot(Optional.of(applySubtreeChange(modification, currentMeta.get(),
 197                     version)));
 198         case MERGE:
 199             final TreeNode result;
 200
 201             // This is a slight optimization: a merge on a non-existing node equals to a write
 202             if (currentMeta.isPresent()) {
 203                 result = applyMerge(modification,currentMeta.get(), version);
 204             } else {
 205                 modification.resolveModificationType(ModificationType.WRITE);
 206                 result = applyWrite(modification, currentMeta, version);
 207             }
 208
 209             return modification.setSnapshot(Optional.of(result));
 210         case WRITE:
 211             modification.resolveModificationType(ModificationType.WRITE);
 212             return modification.setSnapshot(Optional.of(applyWrite(modification, currentMeta, version)));
 213         case NONE:
 214             modification.resolveModificationType(ModificationType.UNMODIFIED);
 215             return currentMeta;
 216         default:
 217             throw new IllegalArgumentException("Provided modification type is not supported.");
 218         }
 219     }
 220
 221     /**
 222      * Apply a merge operation. Since the result of merge differs based on the data type
 223      * being modified, implementations of this method are responsible for calling
 224      * {@link ModifiedNode#resolveModificationType(ModificationType)} as appropriate.
 225      *
 226      * @param modification Modified node
 227      * @param currentMeta Store Metadata Node on which NodeModification should be applied
 228      * @param version New subtree version of parent node
 229      * @return A sealed TreeNode representing applied operation.
 230      */
 231     protected abstract TreeNode applyMerge(ModifiedNode modification,
 232             TreeNode currentMeta, Version version);
 233
 234     protected abstract TreeNode applyWrite(ModifiedNode modification,
 235             Optional<TreeNode> currentMeta, Version version);
 236
 237     protected abstract TreeNode applySubtreeChange(ModifiedNode modification,
 238             TreeNode currentMeta, Version version);
 239
 240     /**
 241      *
 242      * Checks is supplied {@link NodeModification} is applicable for Subtree Modification.
 243      *
 244      * @param path Path to current node
 245      * @param modification Node modification which should be applied.
 246      * @param current Current state of data tree
 247      * @throws ConflictingModificationAppliedException If subtree was changed in conflicting way
 248      * @throws IncorrectDataStructureException If subtree modification is not applicable (e.g. leaf node).
 249      */
 250     protected abstract void checkSubtreeModificationApplicable(YangInstanceIdentifier path, final NodeModification modification,
 251             final Optional<TreeNode> current) throws DataValidationFailedException;
 252
 253     protected abstract void verifyWrittenStructure(NormalizedNode<?, ?> writtenValue);
 254 }