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22
23 package org.xquark.xml.xqueryevaluator.eval;
24
25
26 public class XPathFilter implements Cloneable  {
27 private static final String RCSRevision = "$Revision: 1.1 $";
28 private static final String RCSName = "$Name: $";
29 private int index = 0;
30 private short[] skipCounts;
31 XPathExpr xpath;
32
33 public XPathFilter(XPathExpr xpath) {
34 this.xpath = xpath;
35 skipCounts = new short[xpath.getStepCount()];
36 }
37
38 public boolean isDone() {
39 return index == xpath.getStepCount();
40 }
41
42 protected Object clone() {
43 XPathFilter result = null;
44 try {
45 result = (XPathFilter) super.clone();
46 result.skipCounts = new short[skipCounts.length];
47 for (int i = 0; i < skipCounts.length; i++) {
48 result.skipCounts[i] = skipCounts[i];
49 }
50 } catch (CloneNotSupportedException ex) {}
51 return result;
52 }
53
54 public boolean pushElement(String namespaceURI, String localName) {
55 if (isDone()) return false;
56 if (xpath.isAnyLevel(index)) {
57 skipCounts[index]++;
58 return true;
59 }
60 if (xpath.isSelf(index)) return false;
61 if (xpath.matchElement(namespaceURI, localName, index)) {
62 index++;
63 skipSelfStep(namespaceURI, localName);
64 return true;
65 }
66 return false;
67 }
68
69 public boolean matchDescendantOrSelfStep(String namespaceURI, String localName) {
70 return xpath.isAnyLevel(index) && (xpath.isSelf(index) || skipCounts[index] > 0) && xpath.matchElement(namespaceURI, localName, index);
71 }
72
73 public XPathFilter fork(String namespaceURI, String localName) {
74 XPathFilter next = (XPathFilter) clone();
75 if (next.skipCounts[index] > 0) next.skipCounts[index]--;
76 next.index++;
77 next.skipSelfStep(namespaceURI, localName);
78 return next;
79 }
80
81 public void skipSelfStep(String namespaceURI, String localName) {
82 while (!xpath.isAnyLevel(index) && xpath.isSelfElement(index) && xpath.matchElement(namespaceURI, localName, index)) {
83 index++;
84 }
85 }
86
87 public boolean matchSelf(String uri, String localName) {
88 if (isDone()) return false;
89 for (int i = index; i < xpath.getStepCount(); i++) {
90 if (!xpath.isSelf(i) || !xpath.matchElement(uri, localName, i))
91 return false;
92 }
93 return true;
94 }
95
96 public boolean matchAttribute(String namespaceURI, String localName) {
97 if (isDone()) return false;
98 if (xpath.matchAttribute(namespaceURI, localName, index)) {
99 return true;
100 }
101 return false;
102 }
103
104 public boolean matchText() {
105 if (isDone()) return false;
106 if (!xpath.isAnyLevel(index) && xpath.isSelf(index)) return false;
107 if (xpath.matchText(index)) {
108 for (int i = index+1; i < xpath.getStepCount(); i++) {
109 if (!xpath.isSelf(i) || !xpath.matchText(i))
110 return false;
111 }
112 return true;
113 }
114 return false;
115 }
116
117 public boolean matchSelfText() {
118 if (isDone()) return false;
119 for (int i = index; i < xpath.getStepCount(); i++) {
120 if (!xpath.isSelf(i) || !xpath.matchText(i))
121 return false;
122 }
123 return true;
124 }
125
126 public boolean matchSelfNode() {
127 if (isDone()) return false;
128 for (int i = index; i < xpath.getStepCount(); i++) {
129 if (!xpath.isSelf(i) || !xpath.isSelfNode(i))
130 return false;
131 }
132 return true;
133 }
134
135 public void popElement() {
136 if (!isDone() && skipCounts[index] > 0) skipCounts[index]--;
137 else if (index > 0) index--;
138 }
139
140 }
141 |
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