1/*
2 * Copyright (C) 2007 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package org.apache.harmony.xml.dom;
18
19import org.w3c.dom.Node;
20
21/**
22 * Provides a straightforward implementation of the corresponding W3C DOM
23 * interface. The class is used internally only, thus only notable members that
24 * are not in the original interface are documented (the W3C docs are quite
25 * extensive). Hope that's ok.
26 * <p>
27 * Some of the fields may have package visibility, so other classes belonging to
28 * the DOM implementation can easily access them while maintaining the DOM tree
29 * structure.
30 * <p>
31 * This class represents a Node that has a parent Node, but no children.
32 */
33public abstract class LeafNodeImpl extends NodeImpl {
34
35    // Maintained by InnerNodeImpl.
36    InnerNodeImpl parent;
37
38    // Maintained by InnerNodeImpl.
39    int index;
40
41    LeafNodeImpl(DocumentImpl document) {
42        super(document);
43    }
44
45    public Node getNextSibling() {
46        if (parent == null || index + 1 >= parent.children.size()) {
47            return null;
48        }
49
50        return parent.children.get(index + 1);
51    }
52
53    public Node getParentNode() {
54        return parent;
55    }
56
57    public Node getPreviousSibling() {
58        if (parent == null || index == 0) {
59            return null;
60        }
61
62        return parent.children.get(index - 1);
63    }
64
65    boolean isParentOf(Node node) {
66        return false;
67    }
68
69}
70