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Java > Open Source Codes > com > caucho > xpath > functions > BaseURI


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.functions;
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.expr.AbstractStringExpr;
38 import com.caucho.xpath.pattern.NodeIterator;
39
40 import org.w3c.dom.Node JavaDoc;
41
42 /**
43  * Returns the base URI of a node.
44  */
45 public class BaseURI extends AbstractStringExpr {
46   private static final L10N L = new L10N(BaseURI.class);
47   
48   private Expr _expr;
49
50   public BaseURI(Expr expr)
51     throws XPathParseException
52   {
53     _expr = expr;
54
55     if (expr == null)
56       throw new XPathParseException(L.l("fn:base-uri requires a single argument"));
57   }
58
59   /**
60    * Evaluates the expression as an string.
61    *
62    * @param node the current node
63    * @param env the variable environment.
64    *
65    * @return the string representation of the expression.
66    */
67   public String JavaDoc evalString(Node node, ExprEnvironment env)
68     throws XPathException
69   {
70     NodeIterator iter = _expr.evalNodeSet(node, env);
71
72     Node result = iter.next();
73
74     return QAbstractNode.baseURI(result);
75   }
76
77   public String JavaDoc toString()
78   {
79     return "fn:base-uri(" + _expr + ")";
80   }
81 }
82
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