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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 import java.util.*;
30 import org.lobobrowser.util.*;
31
32 public class FilteredHTMLCollectionImpl extends AbstractScriptableDelegate implements HTMLCollection {
33 private final Map sourceMap;
36 private final NodeFilter filter;
37 private final Object lock;
38 private final NodeImpl rootNode;
39
40 public FilteredHTMLCollectionImpl(NodeImpl rootNode, Map sourceMap, NodeFilter filter, Object lock) {
41 this.sourceMap = sourceMap;
42 this.filter = filter;
43 this.lock = lock;
44 this.rootNode = rootNode;
45 }
46
47 private class CounterNodeVisitor implements NodeVisitor {
48 private int counter = 0;
49
50 public void visit(Node node) {
51 if(filter.accept(node)) {
52 this.counter++;
53 }
54 }
55
56 public int getCount() {
57 return this.counter;
58 }
59 }
60
61 public int getLength() {
62 CounterNodeVisitor visitor = new CounterNodeVisitor();
63 synchronized(this.lock) {
64 this.rootNode.visitImpl(visitor);
65 return visitor.getCount();
66 }
67 }
68
69 public Node item(final int index) {
70 NodeVisitor visitor = new NodeVisitor() {
71 private int counter = 0;
72
73 public void visit(Node node) {
74 if(filter.accept(node)) {
75 if(this.counter == index) {
76 throw new StopVisitorException(node);
77 }
78 this.counter++;
79 }
80 }
81 };
82 synchronized(this.lock) {
83 try {
84 this.rootNode.visitImpl(visitor);
85 return null;
86 } catch(StopVisitorException sve) {
87 return (Node ) sve.getTag();
88 }
89 }
90 }
91
92 public Node namedItem(String name) {
93 synchronized(this.lock) {
94 Node node = (Node ) this.sourceMap.get(name);
95 if(node != null && this.filter.accept(node)) {
96 return node;
97 }
98 return null;
99 }
100 }
101 }
102 |
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