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


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 /**
37  * matches namespace nodes of an element.
38  */
39 public class FromNamespace extends Axis {
40   public FromNamespace(AbstractPattern parent)
41   {
42     super(parent);
43
44     if (parent == null)
45       throw new RuntimeException JavaDoc();
46   }
47
48   /**
49    * matches if the node is a namespace node.
50    */
51   public boolean match(Node JavaDoc node, ExprEnvironment env)
52     throws XPathException
53   {
54     if (node == null)
55       return false;
56
57     if (! (node instanceof NamespaceNode))
58       return false;
59
60     return _parent.match(node.getParentNode(), env);
61   }
62
63
64   /**
65    * Creates a new node iterator.
66    *
67    * @param node the starting node
68    * @param env the variable environment
69    * @param match the axis match pattern
70    *
71    * @return the node iterator
72    */
73   public NodeIterator createNodeIterator(Node JavaDoc node, ExprEnvironment env,
74                                          AbstractPattern match)
75     throws XPathException
76   {
77     NodeIterator parentIter;
78     parentIter = _parent.createNodeIterator(node, env, _parent.copyPosition());
79
80     return new NamespaceIterator(node, parentIter, env, match);
81   }
82
83   public String JavaDoc toString()
84   {
85     return getPrefix() + "namespace::";
86   }
87 }
88
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