|
1
22
23 package org.xquark.xml.xqueryevaluator.eval;
24
25 import java.util.ArrayList  ;
26
27 public class XPathExpr implements Cloneable {
28
29 private static final String RCSRevision = "$Revision: 1.1 $";
30 private static final String RCSName = "$Name: $";
31 private java.util.ArrayList fields = new java.util.ArrayList (4);
32
33 public Object clone() {
34 XPathExpr newExpr = new XPathExpr();
35 newExpr.fields = (ArrayList )fields.clone();
36 return newExpr;
37 }
38
39 public void addElementStep(String namespaceURI, String localName, boolean isAnyLevel, boolean isSelf) {
40 XPathExpr.Step last = removeSelfNodeStep();
41 if (last != null) isAnyLevel = isAnyLevel || last.isAnyLevel();
42 fields.add(new XPathExpr.Step(namespaceURI, localName, isAnyLevel, isSelf, false));
43 }
44
45 public void addAttributeStep(String namespaceURI, String localName, boolean isAnyLevel) {
46 XPathExpr.Step last = removeSelfNodeStep();
47 if (last != null) isAnyLevel = isAnyLevel || last.isAnyLevel();
48 fields.add(new XPathExpr.Step(namespaceURI, localName, isAnyLevel, false, true));
49 }
50
51 public void addTextStep(boolean isAnyLevel, boolean isSelf) {
52 XPathExpr.Step last = removeSelfNodeStep();
53 if (last != null) isAnyLevel = isAnyLevel || last.isAnyLevel();
54 fields.add(new XPathExpr.Step(isAnyLevel, isSelf, true));
55 }
56
57 public void addNodeStep(boolean isAnyLevel, boolean isSelf) {
58 XPathExpr.Step last = removeSelfNodeStep();
59 if (last != null) isAnyLevel = isAnyLevel || last.isAnyLevel();
60 fields.add(new XPathExpr.Step(isAnyLevel, isSelf, false));
61 }
62
63 public int getStepCount() {
64 return fields.size();
65 }
66
67 public boolean matchElement(String uri, String localName, int index) {
68 if (index >= fields.size())
69 return false;
70 XPathExpr.Step step = (XPathExpr.Step) fields.get(index);
71 return step.isElement() && step.matches(uri, localName);
72 }
73
74 public boolean matchAttribute(String uri, String localName, int index) {
75 if (index != fields.size() - 1)
76 return false;
77 XPathExpr.Step step = (XPathExpr.Step) fields.get(index);
78 return step.isAttribute() && step.matches(uri, localName);
79 }
80
81 public boolean matchText(int index) {
82 if (index != fields.size() - 1)
83 return false;
84 XPathExpr.Step step = (XPathExpr.Step) fields.get(index);
85 return step.isText();
86 }
87
88 public boolean isAnyLevel(int index) {
89 if (index >= fields.size())
90 return false;
91 XPathExpr.Step step = (XPathExpr.Step) fields.get(index);
92 return step.isAnyLevel();
93 }
94
95 public boolean isSelf(int index) {
96 if (index >= fields.size())
97 return false;
98 XPathExpr.Step step = (XPathExpr.Step) fields.get(index);
99 return step.isSelf();
100 }
101
102 public boolean isSelfElement(int index) {
103 if (index >= fields.size())
104 return false;
105 XPathExpr.Step step = (XPathExpr.Step) fields.get(index);
106 return step.isSelfElement();
107 }
108
109 public boolean isSelfNode(int index) {
110 if (index >= fields.size())
111 return false;
112 XPathExpr.Step step = (XPathExpr.Step) fields.get(index);
113 return step.isSelfNode();
114 }
115
116 public void removeLastSelfNodeStep() {
117 int lastIndex = fields.size()-1;
118 if (lastIndex >= 0) {
119 XPathExpr.Step last = (XPathExpr.Step) fields.get(lastIndex);
120 if (last.isSelfNode() && !last.isAnyLevel())
121 fields.remove(lastIndex);
122 }
123 }
124
125 private XPathExpr.Step removeSelfNodeStep() {
126 int lastIndex = fields.size()-1;
127 if (lastIndex < 0) return null;
128 XPathExpr.Step last = (XPathExpr.Step) fields.get(lastIndex);
129 if (last.isSelfNode()) {
130 fields.remove(lastIndex);
131 return last;
132 } else {
133 return null;
134 }
135 }
136
137 static class Step {
138 private static final String RCSRevision = "$Revision: 1.1 $";
139 private static final String RCSName = "$Name: $";
140 private static final int ELEMENT = 0;
141 private static final int ATTR = 1;
142 private static final int TEXT = 2;
143 private static final int NODE = 3;
144
145 int nodeKind;
146 String namespaceURI;
147 String localName;
148 boolean isAny = false;
149 boolean anyNamespace = false;
150 boolean anyLevel = false;
151 boolean isSelf = false;
152
153 Step(String namespaceURI, String localName, boolean isAnyLevel, boolean isSelf, boolean isAttribute) {
154 this.namespaceURI = namespaceURI;
155 this.localName = localName;
156 this.anyLevel = isAnyLevel;
157 this.isSelf = isSelf;
158 this.nodeKind = isAttribute ? ATTR : ELEMENT;
159 if ("*".equals(namespaceURI)) {
160 anyNamespace = true;
161 }
162 if ("*".equals(localName)) {
163 this.localName = null;
164 if (namespaceURI == null || anyNamespace)
165 isAny = true;
166 }
167 }
168
169 Step(boolean isAnyLevel, boolean isSelf, boolean isText) {
170 this.anyLevel = isAnyLevel;
171 this.isSelf = isSelf;
172 this.nodeKind = isText ? TEXT : NODE;
173 this.isAny = !isText;
174 }
175
176 boolean isAttribute() {
177 return nodeKind == ATTR;
178 }
179
180 boolean isElement() {
181 return nodeKind == ELEMENT || nodeKind == NODE;
182 }
183
184 boolean isText() {
185 return nodeKind == TEXT || nodeKind == NODE;
186 }
187
188 boolean matches(String ns, String name) {
189 if (isAny) {
190 return true;
191 } else if (localName == null) {
192 return namespaceURI.equals(ns);
193 } else {
194 return localName.equals(name)
195 && (anyNamespace
196 || (namespaceURI == null && ns == null)
197 || (namespaceURI != null && namespaceURI.equals(ns)));
198 }
199 }
200
201 boolean isAnyLevel() {
202 return anyLevel;
203 }
204
205 boolean isSelf() {
206 return isSelf;
207 }
208
209 boolean isSelfNode() {
210 return isSelf && nodeKind == NODE;
211 }
212
213 boolean isSelfElement() {
214 return isSelf && nodeKind == ELEMENT;
215 }
216 }
217 }
218 |
Popular Tags |
Java API By Example, From Geeks To Geeks.