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Java > Open Source Codes > com > caucho > xpath > pattern > NamespacePattern


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.pattern;
30
31 import com.caucho.xpath.ExprEnvironment;
32 import com.caucho.xpath.XPathException;
33
34 import org.w3c.dom.Node JavaDoc;
35
36 public class NamespacePattern extends AbstractPattern {
37   private String JavaDoc _prefix;
38   private int _nodeType;
39
40   public NamespacePattern(AbstractPattern parent, String JavaDoc prefix, int nodeType)
41   {
42     super(parent);
43
44     _prefix = prefix.intern();
45     _nodeType = nodeType;
46
47     if (parent == null)
48       throw new RuntimeException JavaDoc();
49   }
50
51   /**
52    * The node-type priority is less than nodes.
53    */
54   public double getPriority()
55   {
56     return -0.25;
57   }
58
59   /**
60    * Matches if the namespace matches and the local name matches.
61    *
62    * @param node the current node
63    * @param env the variable environment
64    *
65    * @return true if the node matches
66    */
67   public boolean match(Node JavaDoc node, ExprEnvironment env)
68     throws XPathException
69   {
70     if (node == null)
71       return false;
72
73     if (node.getNodeType() != _nodeType)
74       return false;
75
76     String JavaDoc prefix = node.getPrefix();
77
78     if (prefix != _prefix)
79       return false;
80
81     return _parent.match(node, env);
82   }
83
84   public String JavaDoc toString()
85   {
86     switch (_nodeType) {
87     case Node.ATTRIBUTE_NODE:
88       return _parent.toString() + "@" + _prefix + ":*";
89     case Node.ELEMENT_NODE:
90       return _parent.toString() + _prefix + ":*";
91
92     default:
93       return super.toString();
94     }
95   }
96 }
97
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