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


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.XPathContext;
5 import net.sf.saxon.om.Item;
6 import net.sf.saxon.om.NodeInfo;
7 import net.sf.saxon.trans.XPathException;
8 import net.sf.saxon.value.AnyURIValue;
9
10 /**
11 * This class supports the base-uri() functions in XPath 2.0
12 */
13
14 public class BaseURI extends SystemFunction {
15
16     /**
17     * Simplify and validate.
18     * This is a pure function so it can be simplified in advance if the arguments are known
19     */
20
21      public Expression simplify(StaticContext env) throws XPathException {
22         useContextItemAsDefault();
23         return simplifyArguments(env);
24     }
25
26     /**
27     * Evaluate the function at run-time
28     */
29
30     public Item evaluateItem(XPathContext c) throws XPathException {
31         NodeInfo node = (NodeInfo)argument[0].evaluateItem(c);
32         if (node==null) {
33             return null;
34         }
35         String JavaDoc s = node.getBaseURI();
36         if (s == null) {
37             return null;
38         }
39         return new AnyURIValue(s);
40     }
41
42 }
43
44 //
45 // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
46 // you may not use this file except in compliance with the License. You may obtain a copy of the
47 // License at http://www.mozilla.org/MPL/
48 //
49 // Software distributed under the License is distributed on an "AS IS" basis,
50 // WITHOUT WARRANTY OF ANY KIND, either express or implied.
51 // See the License for the specific language governing rights and limitations under the License.
52 //
53 // The Original Code is: all this file.
54 //
55 // The Initial Developer of the Original Code is Michael H. Kay.
56 //
57 // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
58 //
59 // Contributor(s): none.
60 //
61
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