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.checkState;
12 import java.util.Map.Entry;
14 import org.opendaylight.controller.md.sal.dom.store.impl.tree.NodeModification;
15 import org.opendaylight.controller.md.sal.dom.store.impl.tree.StoreMetadataNode;
16 import org.opendaylight.controller.md.sal.dom.store.impl.tree.TreeNodeUtils;
17 import org.opendaylight.yangtools.yang.data.api.InstanceIdentifier;
18 import org.opendaylight.yangtools.yang.data.api.InstanceIdentifier.PathArgument;
19 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
20 import org.opendaylight.yangtools.yang.data.impl.schema.NormalizedNodeUtils;
21 import org.slf4j.Logger;
22 import org.slf4j.LoggerFactory;
24 import com.google.common.base.Optional;
26 class MutableDataTree {
28 private static final Logger log = LoggerFactory.getLogger(MutableDataTree.class);
30 final DataAndMetadataSnapshot snapshot;
31 final NodeModification rootModification;
32 final ModificationApplyOperation strategyTree;
34 private boolean sealed = false;
36 private MutableDataTree(final DataAndMetadataSnapshot snapshot, final ModificationApplyOperation strategyTree) {
37 this.snapshot = snapshot;
38 this.strategyTree = strategyTree;
39 this.rootModification = NodeModification.createUnmodified(snapshot.getMetadataTree());
42 public void write(final InstanceIdentifier path, final NormalizedNode<?, ?> value) {
44 resolveModificationFor(path).write(value);
47 public void delete(final InstanceIdentifier path) {
49 resolveModificationFor(path).delete();
52 public Optional<NormalizedNode<?, ?>> read(final InstanceIdentifier path) {
53 Entry<InstanceIdentifier, NodeModification> modification = TreeNodeUtils.findClosestsOrFirstMatch(rootModification, path, NodeModification.IS_TERMINAL_PREDICATE);
55 Optional<StoreMetadataNode> result = resolveSnapshot(modification);
56 if (result.isPresent()) {
57 NormalizedNode<?, ?> data = result.get().getData();
58 return NormalizedNodeUtils.findNode(modification.getKey(), data, path);
60 return Optional.absent();
64 private Optional<StoreMetadataNode> resolveSnapshot(
65 final Entry<InstanceIdentifier, NodeModification> keyModification) {
66 InstanceIdentifier path = keyModification.getKey();
67 NodeModification modification = keyModification.getValue();
68 return resolveSnapshot(path, modification);
71 private Optional<StoreMetadataNode> resolveSnapshot(final InstanceIdentifier path,
72 final NodeModification modification) {
74 Optional<Optional<StoreMetadataNode>> potentialSnapshot = modification.getSnapshotCache();
75 if(potentialSnapshot.isPresent()) {
76 return potentialSnapshot.get();
78 return resolveModificationStrategy(path).apply(modification, modification.getOriginal(),
79 StoreUtils.increase(snapshot.getMetadataTree().getSubtreeVersion()));
80 } catch (Exception e) {
81 log.error("Could not create snapshot for {}", path,e);
86 private ModificationApplyOperation resolveModificationStrategy(final InstanceIdentifier path) {
87 log.trace("Resolving modification apply strategy for {}", path);
88 return TreeNodeUtils.findNodeChecked(strategyTree, path);
91 private OperationWithModification resolveModificationFor(final InstanceIdentifier path) {
92 NodeModification modification = rootModification;
93 // We ensure strategy is present.
94 ModificationApplyOperation operation = resolveModificationStrategy(path);
95 for (PathArgument pathArg : path.getPath()) {
96 modification = modification.modifyChild(pathArg);
98 return OperationWithModification.from(operation, modification);
101 public static MutableDataTree from(final DataAndMetadataSnapshot snapshot, final ModificationApplyOperation resolver) {
102 return new MutableDataTree(snapshot, resolver);
107 rootModification.seal();
110 private void checkSealed() {
111 checkState(!sealed, "Data Tree is sealed. No further modifications allowed.");
114 protected NodeModification getRootModification() {
115 return rootModification;
119 public String toString() {
120 return "MutableDataTree [modification=" + rootModification + "]";