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1 package com.icl.saxon.expr;
2 import com.icl.saxon.om.NodeEnumeration;
3 import com.icl.saxon.om.NodeInfo;
4 import com.icl.saxon.Context;
5
6
7
11
12 public class NodeSetComparison extends Expression {
13
14 NodeSetExpression nodeset;
15 int operator;
16 Value value;
17
18 public NodeSetComparison(NodeSetExpression p1, int op, Value p2) {
19 nodeset = p1;
20 operator = op;
21 value = p2;
22 }
23
24
28
29 public Expression simplify() {
30 return this;
31 }
32
33
38
39 public Value evaluate(Context c) throws XPathException {
40 return new BooleanValue(evaluateAsBoolean(c));
41 }
42
43
48
49 public boolean evaluateAsBoolean(Context c) throws XPathException {
50 NodeEnumeration enum = nodeset.enumerate(c, false);
51 switch (operator) {
52 case Tokenizer.EQUALS:
53 if (value.getDataType() == value.NUMBER) {
54 double n1 = value.asNumber();
55 while (enum.hasMoreElements()) {
56 NodeInfo node = enum.nextElement();
57 if (Value.stringToNumber(node.getStringValue()) == n1) {
58 return true;
59 }
60 }
61 return false;
62 } else {
63 String s1 = value.asString();
64 while (enum.hasMoreElements()) {
65 NodeInfo node = enum.nextElement();
66 if (node.getStringValue().equals(s1)) {
67 return true;
68 }
69 }
70 return false;
71 }
72
73 case Tokenizer.NE:
74 if (value.getDataType() == value.NUMBER) {
75 double n2 = value.asNumber();
76 while (enum.hasMoreElements()) {
77 NodeInfo node = enum.nextElement();
78 if (Value.stringToNumber(node.getStringValue()) != n2) {
79 return true;
80 }
81 }
82 return false;
83 } else {
84 String s2 = value.asString();
85 while (enum.hasMoreElements()) {
86 NodeInfo node = enum.nextElement();
87 if (!node.getStringValue().equals(s2)) {
88 return true;
89 }
90 }
91 return false;
92 }
93
94 case Tokenizer.LE:
95 double n1 = value.asNumber();
96 while (enum.hasMoreElements()) {
97 NodeInfo node = enum.nextElement();
98 if (Value.stringToNumber(node.getStringValue()) <= n1) {
99 return true;
100 }
101 }
102 return false;
103
104 case Tokenizer.LT:
105 double n2 = value.asNumber();
106 while (enum.hasMoreElements()) {
107 NodeInfo node = enum.nextElement();
108 if (Value.stringToNumber(node.getStringValue()) < n2) {
109 return true;
110 }
111 }
112 return false;
113
114 case Tokenizer.GE:
115 double n3 = value.asNumber();
116 while (enum.hasMoreElements()) {
117 NodeInfo node = enum.nextElement();
118 if (Value.stringToNumber(node.getStringValue()) >= n3) {
119 return true;
120 }
121 }
122 return false;
123
124 case Tokenizer.GT:
125 double n4 = value.asNumber();
126 while (enum.hasMoreElements()) {
127 NodeInfo node = enum.nextElement();
128 if (Value.stringToNumber(node.getStringValue()) > n4) {
129 return true;
130 }
131 }
132 return false;
133
134 default:
135 return false;
136 }
137
138
139 }
140
141
145
146 public int getDataType() {
147 return Value.BOOLEAN;
148 }
149
150
155
156 public int getDependencies() {
157 return nodeset.getDependencies();
158 }
159
160
168
169 public Expression reduce(int dependencies, Context context) throws XPathException {
170 if ((nodeset.getDependencies() & dependencies) != 0 ) {
171 Expression e = nodeset.reduce(dependencies, context);
172 if (e instanceof SingletonExpression) {
173 e = new SingletonComparison(
174 (SingletonExpression)e,
175 operator,
176 value);
177 e.setStaticContext(getStaticContext());
178 return e.simplify();
179 } else if (e instanceof NodeSetExpression) {
180 e = new NodeSetComparison(
181 (NodeSetExpression)e,
182 operator,
183 value);
184 e.setStaticContext(getStaticContext());
185 return e.simplify();
186 } else if (e instanceof NodeSetValue) {
187 return new BooleanValue(((NodeSetValue)e).compare(operator, value));
188 } else {
189 throw new XPathException("Failed to reduce NodeSetComparison: returned " + e.getClass());
190 }
191 } else {
192 return this;
193 }
194 }
195
196
199
200 public void display(int level) {
201 System.err.println(indent(level) + Tokenizer.tokens[operator]);
202 nodeset.display(level+1);
203 value.display(level+1);
204 }
205
206 }
207
208 |
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