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.yangtools.yang.data.impl.schema.tree;
10 import com.google.common.base.MoreObjects;
11 import com.google.common.base.Preconditions;
12 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNodes;
13 import org.opendaylight.yangtools.yang.data.api.schema.tree.spi.TreeNode;
14 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
17 * Instances of this class hold the current state of a DataTree instance.
18 * The need for encapsulation stems from atomic updates, which potentially change
19 * multiple fields in one go.
21 final class DataTreeState {
22 private final LatestOperationHolder holder;
23 private final SchemaContext schemaContext;
24 private final TreeNode root;
26 private DataTreeState(final TreeNode root) {
27 this.root = Preconditions.checkNotNull(root);
28 holder = new LatestOperationHolder();
32 private DataTreeState(final TreeNode root, final LatestOperationHolder holder, final SchemaContext schemaContext) {
33 // It should be impossible to instantiate a new root without a SchemaContext
34 this.schemaContext = Preconditions.checkNotNull(schemaContext);
35 this.holder = Preconditions.checkNotNull(holder);
36 this.root = Preconditions.checkNotNull(root);
39 static DataTreeState createInitial(final TreeNode root) {
40 return new DataTreeState(root);
47 InMemoryDataTreeSnapshot newSnapshot() {
48 return new InMemoryDataTreeSnapshot(schemaContext, root, holder.newSnapshot());
51 DataTreeState withSchemaContext(final SchemaContext newSchemaContext, final ModificationApplyOperation operation) {
52 holder.setCurrent(operation);
53 return new DataTreeState(root, holder, newSchemaContext);
56 DataTreeState withRoot(final TreeNode newRoot) {
57 return new DataTreeState(newRoot, holder, schemaContext);
61 public String toString() {
62 final TreeNode r = root;
63 return MoreObjects.toStringHelper(this).add("data", NormalizedNodes.toStringTree(r.getData())).toString();