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1
21
24 package org.lobobrowser.html.domimpl;
25
26 import org.lobobrowser.js.*;
27 import org.w3c.dom.Node  ;
28 import org.w3c.dom.html2.HTMLCollection;
29
30 public class DescendentHTMLCollection extends AbstractScriptableDelegate implements HTMLCollection {
31 private final NodeImpl rootNode;
33 private final NodeFilter nodeFilter;
34
35
39 public DescendentHTMLCollection(NodeImpl node, NodeFilter filter) {
40 super();
41 rootNode = node;
42 nodeFilter = filter;
43 }
44
45 public int getLength() {
46 NodeCounter nc = new NodeCounter();
47 this.rootNode.visit(nc);
48 return nc.getCount();
49 }
50
51 public Node item(int index) {
52 NodeScanner ns = new NodeScanner(index);
53 try {
54 this.rootNode.visit(ns);
55 } catch(StopVisitorException sve) {
56 }
58 return ns.getNode();
59 }
60
61 public Node namedItem(String name) {
62 org.w3c.dom.Document doc = this.rootNode.getOwnerDocument();
63 if(doc == null) {
64 return null;
65 }
66 Node node = (Node ) doc.getElementById(name);
68 if(node != null && this.nodeFilter.accept(node)) {
69 return node;
70 }
71 return null;
72 }
73
74 public int indexOf(Node node) {
75 NodeScanner2 ns = new NodeScanner2(node);
76 try {
77 this.rootNode.visit(ns);
78 } catch(StopVisitorException sve) {
79 }
81 return ns.getIndex();
82 }
83
84 private final class NodeCounter implements NodeVisitor {
85 private int count = 0;
86
87 public final void visit(Node node) {
88 if(nodeFilter.accept(node)) {
89 this.count++;
90 throw new SkipVisitorException();
91 }
92 }
93
94 public int getCount() {
95 return this.count;
96 }
97 }
98
99 private final class NodeScanner implements NodeVisitor {
100 private int count = 0;
101 private Node foundNode = null;
102 private final int targetIndex;
103
104 public NodeScanner(int idx) {
105 this.targetIndex = idx;
106 }
107
108 public final void visit(Node node) {
109 if(nodeFilter.accept(node)) {
110 if(this.count == this.targetIndex) {
111 this.foundNode = node;
112 throw new StopVisitorException();
113 }
114 this.count++;
115 throw new SkipVisitorException();
116 }
117 }
118
119 public Node getNode() {
120 return this.foundNode;
121 }
122 }
123
124 private final class NodeScanner2 implements NodeVisitor {
125 private int count = 0;
126 private int foundIndex = -1;
127 private final Node targetNode;
128
129 public NodeScanner2(Node node) {
130 this.targetNode = node;
131 }
132
133 public final void visit(Node node) {
134 if(nodeFilter.accept(node)) {
135 if(node == this.targetNode) {
136 this.foundIndex = this.count;
137 throw new StopVisitorException();
138 }
139 this.count++;
140 throw new SkipVisitorException();
141 }
142 }
143
144 public int getIndex() {
145 return this.foundIndex;
146 }
147 }
148
149 }
150 |
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