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1 package com.thoughtworks.xstream.io.xml;
2
3 import com.thoughtworks.xstream.converters.ErrorWriter;
4 import com.thoughtworks.xstream.io.HierarchicalStreamReader;
5 import org.w3c.dom.*;
6
7 import java.util.ArrayList  ;
8 import java.util.LinkedList ;
9 import java.util.List ;
10
11 public class DomReader implements HierarchicalStreamReader {
12
13 private Element currentElement;
14 private StringBuffer textBuffer;
15 private NodeList childNodes;
16 private LinkedList pointers = new LinkedList ();
17 private List childElements;
18
19 public DomReader(Element rootElement) {
20 textBuffer = new StringBuffer (180);
21 pointers.addLast(new Pointer());
22 setCurrent(rootElement);
23 }
24
25 public DomReader(Document document) {
26 textBuffer = new StringBuffer (180);
27 pointers.addLast(new Pointer());
28 setCurrent(document.getDocumentElement());
29 }
30
31 public String getNodeName() {
32 return currentElement.getTagName();
33 }
34
35 public String getValue() {
36 NodeList childNodes = currentElement.getChildNodes();
37 textBuffer.setLength(0);
38 int length = childNodes.getLength();
39 for (int i = 0; i < length; i++) {
40 Node childNode = childNodes.item(i);
41 if (childNode instanceof Text) {
42 Text text = (Text) childNode;
43 textBuffer.append(text.getData());
44 }
45 }
46 return textBuffer.toString();
47 }
48
49 public String getAttribute(String name) {
50 Attr attribute = currentElement.getAttributeNode(name);
51 return attribute == null ? null : attribute.getValue();
52 }
53
54 public Object peekUnderlyingNode() {
55 return currentElement;
56 }
57
58 private void setCurrent(Object currentElementObj) {
59 this.currentElement = (Element) currentElementObj;
60 childNodes = currentElement.getChildNodes();
61 childElements = new ArrayList ();
62 for (int i = 0; i < childNodes.getLength(); i++) {
63 Node node = childNodes.item(i);
64 if (node instanceof Element) {
65 childElements.add(node);
66 }
67 }
68 }
69
70 private class Pointer {
71 public int v;
72 }
73
74 public boolean hasMoreChildren() {
75 Pointer pointer = (Pointer) pointers.getLast();
76
77 if (pointer.v < childElements.size()) {
78 return true;
79 } else {
80 return false;
81 }
82 }
83
84 public void moveUp() {
85 setCurrent(currentElement.getParentNode());
86 pointers.removeLast();
87 }
88
89 public void moveDown() {
90 Pointer pointer = (Pointer) pointers.getLast();
91 pointers.addLast(new Pointer());
92
93 setCurrent(childElements.get(pointer.v));
94
95 pointer.v++;
96
97 }
98
99 public void appendErrors(ErrorWriter errorWriter) {
100 }
101 }
102 |
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