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Java > Open Source Codes > net > sf > saxon > functions > RegexGroup


1 package net.sf.saxon.functions;
2 import net.sf.saxon.expr.Expression;
3 import net.sf.saxon.expr.StaticContext;
4 import net.sf.saxon.expr.StaticProperty;
5 import net.sf.saxon.expr.XPathContext;
6 import net.sf.saxon.instruct.RegexIterator;
7 import net.sf.saxon.om.Item;
8 import net.sf.saxon.trans.XPathException;
9 import net.sf.saxon.value.AtomicValue;
10 import net.sf.saxon.value.NumericValue;
11 import net.sf.saxon.value.StringValue;
12
13
14 public class RegexGroup extends SystemFunction implements XSLTFunction {
15
16     /**
17     * preEvaluate: this method suppresses compile-time evaluation by doing nothing
18     */
19
20     public Expression preEvaluate(StaticContext env) {
21         return this;
22     }
23
24     /**
25     * Evaluate in a general context
26     */
27
28     public Item evaluateItem(XPathContext c) throws XPathException {
29         AtomicValue gp0 = (AtomicValue)argument[0].evaluateItem(c);
30         NumericValue gp = (NumericValue)gp0.getPrimitiveValue();
31         RegexIterator iter = c.getCurrentRegexIterator();
32         if (iter == null) return null;
33         String JavaDoc s = iter.getRegexGroup((int)gp.longValue());
34         if (s == null) return null;
35         return StringValue.makeStringValue(s);
36     }
37
38     /**
39     * Determine the dependencies
40     */
41
42     public int getIntrinsicDependencies() {
43        return StaticProperty.DEPENDS_ON_REGEX_GROUP;
44     }
45
46 }
47
48
49
50
51 //
52 // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
53 // you may not use this file except in compliance with the License. You may obtain a copy of the
54 // License at http://www.mozilla.org/MPL/
55 //
56 // Software distributed under the License is distributed on an "AS IS" basis,
57 // WITHOUT WARRANTY OF ANY KIND, either express or implied.
58 // See the License for the specific language governing rights and limitations under the License.
59 //
60 // The Original Code is: all this file.
61 //
62 // The Initial Developer of the Original Code is Michael H. Kay.
63 //
64 // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
65 //
66 // Contributor(s): none.
67 //
68
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