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1 package com.thoughtworks.xstream.io.xml;
2
3 import com.thoughtworks.xstream.converters.ErrorWriter;
4 import com.thoughtworks.xstream.core.util.FastStack;
5 import com.thoughtworks.xstream.io.HierarchicalStreamReader;
6 import com.thoughtworks.xstream.io.AttributeNameIterator;
7
8 import java.util.Iterator  ;
9
10 public abstract class AbstractDocumentReader implements HierarchicalStreamReader {
11
12 private FastStack pointers = new FastStack(16);
13 private Object current;
14
15 protected AbstractDocumentReader(Object rootElement) {
16 this.current = rootElement;
17 pointers.push(new Pointer());
18 reassignCurrentElement(current);
19 }
20
21 protected abstract void reassignCurrentElement(Object current);
22 protected abstract Object getParent();
23 protected abstract Object getChild(int index);
24 protected abstract int getChildCount();
25
26 private static class Pointer {
27 public int v;
28 }
29
30 public boolean hasMoreChildren() {
31 Pointer pointer = (Pointer) pointers.peek();
32
33 if (pointer.v < getChildCount()) {
34 return true;
35 } else {
36 return false;
37 }
38 }
39
40 public void moveUp() {
41 current = getParent();
42 pointers.popSilently();
43 reassignCurrentElement(current);
44 }
45
46 public void moveDown() {
47 Pointer pointer = (Pointer) pointers.peek();
48 pointers.push(new Pointer());
49
50 current = getChild(pointer.v);
51
52 pointer.v++;
53 reassignCurrentElement(current);
54 }
55
56 public Iterator getAttributeNames() {
57 return new AttributeNameIterator(this);
58 }
59
60 public void appendErrors(ErrorWriter errorWriter) {
61 }
62
63 public Object peekUnderlyingNode() {
64 return current;
65 }
66
67 public void close() {
68 }
70
71 public HierarchicalStreamReader underlyingReader() {
72 return this;
73 }
74 }
75 |
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