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


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
39 import org.w3c.dom.Node JavaDoc;
40
41 /**
42  * Returns a relative URI against another.
43  */
44 public class ResolveURI extends AbstractStringExpr {
45   private static final L10N L = new L10N(ResolveURI.class);
46   
47   private Expr _relExpr;
48   private Expr _baseExpr;
49
50   public ResolveURI(Expr relExpr, Expr baseExpr)
51     throws XPathParseException
52   {
53     _relExpr = relExpr;
54     _baseExpr = baseExpr;
55
56     if (relExpr == null)
57       throw new XPathParseException(L.l("fn:resolve-uri(relative,[base])"));
58   }
59
60   /**
61    * Evaluates the expression as an string.
62    *
63    * @param node the current node
64    * @param env the variable environment.
65    *
66    * @return the string representation of the expression.
67    */
68   public String JavaDoc evalString(Node node, ExprEnvironment env)
69     throws XPathException
70   {
71     String JavaDoc rel = _relExpr.evalString(node, env);
72
73     if (rel.startsWith("/") ||
74     rel.indexOf(':') > 0 && rel.indexOf(':') < '/')
75       return rel;
76
77     String JavaDoc base;
78
79     if (_baseExpr != null)
80       base = _baseExpr.evalString(node, env);
81     else
82       base = QAbstractNode.baseURI(node);
83
84     int last = base.lastIndexOf('/');
85
86     if (last < 0)
87       return rel;
88     else
89       return base.substring(0, last + 1) + rel;
90   }
91
92   public String JavaDoc toString()
93   {
94     if (_baseExpr != null)
95       return "fn:resolve-uri(" + _relExpr + "," + _baseExpr + ")";
96     else
97       return "fn:resolve-uri(" + _relExpr + ")";
98   }
99 }
100
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