2 * Copyright (c) 2014 Cisco Systems, Inc. and others. All rights reserved.
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
8 package org.opendaylight.controller.md.sal.dom.store.impl;
10 import static com.google.common.base.Preconditions.checkArgument;
11 import static com.google.common.base.Preconditions.checkState;
13 import java.util.Map.Entry;
15 import org.opendaylight.controller.md.sal.dom.store.impl.tree.NodeModification;
16 import org.opendaylight.controller.md.sal.dom.store.impl.tree.StoreMetadataNode;
17 import org.opendaylight.controller.md.sal.dom.store.impl.tree.TreeNodeUtils;
18 import org.opendaylight.yangtools.yang.data.api.InstanceIdentifier;
19 import org.opendaylight.yangtools.yang.data.api.InstanceIdentifier.PathArgument;
20 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
21 import org.opendaylight.yangtools.yang.data.impl.schema.NormalizedNodeUtils;
22 import org.slf4j.Logger;
23 import org.slf4j.LoggerFactory;
25 import com.google.common.base.Optional;
27 class MutableDataTree {
29 private static final Logger log = LoggerFactory.getLogger(MutableDataTree.class);
31 final DataAndMetadataSnapshot snapshot;
32 final NodeModification rootModification;
33 final ModificationApplyOperation strategyTree;
35 private boolean sealed = false;
37 private MutableDataTree(final DataAndMetadataSnapshot snapshot, final ModificationApplyOperation strategyTree) {
38 this.snapshot = snapshot;
39 this.strategyTree = strategyTree;
40 this.rootModification = NodeModification.createUnmodified(snapshot.getMetadataTree());
43 public void write(final InstanceIdentifier path, final NormalizedNode<?, ?> value) {
45 resolveModificationFor(path).write(value);
48 public void delete(final InstanceIdentifier path) {
50 resolveModificationFor(path).delete();
53 public Optional<NormalizedNode<?, ?>> read(final InstanceIdentifier path) {
54 Entry<InstanceIdentifier, NodeModification> modification = TreeNodeUtils.findClosest(rootModification, path);
55 return getModifiedVersion(path, modification);
58 private Optional<NormalizedNode<?, ?>> getModifiedVersion(final InstanceIdentifier path,
59 final Entry<InstanceIdentifier, NodeModification> modification) {
60 Optional<StoreMetadataNode> result = resolveSnapshot(modification);
61 if (result.isPresent()) {
62 NormalizedNode<?, ?> data = result.get().getData();
63 return NormalizedNodeUtils.findNode(modification.getKey(), data, path);
65 return Optional.absent();
69 private Optional<StoreMetadataNode> resolveSnapshot(
70 final Entry<InstanceIdentifier, NodeModification> keyModification) {
71 InstanceIdentifier path = keyModification.getKey();
72 NodeModification modification = keyModification.getValue();
73 return resolveSnapshot(path, modification);
76 private Optional<StoreMetadataNode> resolveSnapshot(final InstanceIdentifier path,
77 final NodeModification modification) {
79 return resolveModificationStrategy(path).apply(modification, modification.getOriginal(),
80 StoreUtils.increase(snapshot.getMetadataTree().getSubtreeVersion()));
81 } catch (Exception e) {
82 log.error("Could not create snapshot for {},", e);
87 private ModificationApplyOperation resolveModificationStrategy(final InstanceIdentifier path) {
88 log.trace("Resolving modification apply strategy for {}", path);
89 Optional<ModificationApplyOperation> strategy = TreeNodeUtils.findNode(strategyTree, path);
90 checkArgument(strategy.isPresent(),
91 "Provided path %s is not supported by data store. No schema available for it.", path);
92 return strategy.get();
95 private OperationWithModification resolveModificationFor(final InstanceIdentifier path) {
96 NodeModification modification = rootModification;
97 // We ensure strategy is present.
98 ModificationApplyOperation operation = resolveModificationStrategy(path);
99 for (PathArgument pathArg : path.getPath()) {
100 modification = modification.modifyChild(pathArg);
102 return OperationWithModification.from(operation, modification);
105 public static MutableDataTree from(final DataAndMetadataSnapshot snapshot, final ModificationApplyOperation resolver) {
106 return new MutableDataTree(snapshot, resolver);
111 rootModification.seal();
114 private void checkSealed() {
115 checkState(!sealed, "Data Tree is sealed. No further modifications allowed.");
118 protected NodeModification getRootModification() {
119 return rootModification;