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Java > Open Source Codes > com > caucho > xpath > expr > Functions


1 /*
2  * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
3  *
4  * This file is part of Resin(R) Open Source
5  *
6  * Each copy or derived work must preserve the copyright notice and this
7  * notice unmodified.
8  *
9  * Resin Open Source is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * Resin Open Source is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17  * of NON-INFRINGEMENT. See the GNU General Public License for more
18  * details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with Resin Open Source; if not, write to the
22  * Free SoftwareFoundation, Inc.
23  * 59 Temple Place, Suite 330
24  * Boston, MA 02111-1307 USA
25  *
26  * @author Scott Ferguson
27  */
28
29 package com.caucho.xpath.expr;
30
31 import com.caucho.util.L10N;
32 import com.caucho.xml.QAbstractNode;
33 import com.caucho.xpath.Expr;
34 import com.caucho.xpath.ExprEnvironment;
35 import com.caucho.xpath.XPathException;
36 import com.caucho.xpath.XPathParseException;
37 import com.caucho.xpath.pattern.NodeIterator;
38
39 import org.w3c.dom.Node JavaDoc;
40
41 /**
42  * Contains the builtin XPath functions.
43  */
44 public class Functions {
45   static final L10N L = new L10N(Functions.class);
46
47   private Functions() {}
48   
49   /**
50    * Returns the fn:base-uri value.
51    */
52   public static class BaseURI extends AbstractStringExpr {
53     private Expr _expr;
54
55     public BaseURI(Expr expr)
56       throws XPathParseException
57     {
58       _expr = expr;
59
60       if (expr == null)
61     throw new XPathParseException(L.l("fn:base-uri requires a single argument"));
62     }
63
64     /**
65      * Evaluates the expression as an string.
66      *
67      * @param node the current node
68      * @param env the variable environment.
69      *
70      * @return the string representation of the expression.
71      */
72     public String JavaDoc evalString(Node node, ExprEnvironment env)
73       throws XPathException
74     {
75       NodeIterator iter = _expr.evalNodeSet(node, env);
76
77       Node result = iter.next();
78
79       return QAbstractNode.baseURI(result);
80     }
81
82     public String JavaDoc toString()
83     {
84       return "fn:base-uri(" + _expr + ")";
85     }
86   }
87 }
88
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