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


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.om.Item;
7 import net.sf.saxon.trans.XPathException;
8 import net.sf.saxon.value.IntegerValue;
9
10 /**
11 * Implement the XPath 1.0 function last()
12 */
13
14
15 public class Last extends SystemFunction {
16
17     /**
18     * preEvaluate: this method suppresses compile-time evaluation by doing nothing
19     * (because the value of the expression depends on the runtime context)
20     */
21
22     public Expression preEvaluate(StaticContext env) {
23         return this;
24     }
25
26     /**
27     * Evaluate in a general context
28     */
29
30     public Item evaluateItem(XPathContext c) throws XPathException {
31         return new IntegerValue(c.getLast());
32     }
33
34     /**
35     * Determine the dependencies
36     */
37
38     public int getIntrinsicDependencies() {
39         return StaticProperty.DEPENDS_ON_LAST;
40     }
41
42 }
43
44
45
46 //
47 // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
48 // you may not use this file except in compliance with the License. You may obtain a copy of the
49 // License at http://www.mozilla.org/MPL/
50 //
51 // Software distributed under the License is distributed on an "AS IS" basis,
52 // WITHOUT WARRANTY OF ANY KIND, either express or implied.
53 // See the License for the specific language governing rights and limitations under the License.
54 //
55 // The Original Code is: all this file.
56 //
57 // The Initial Developer of the Original Code is Michael H. Kay.
58 //
59 // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
60 //
61 // Contributor(s): none.
62 //
63
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