01: /*
02: * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
03: *
04: * This file is part of Resin(R) Open Source
05: *
06: * Each copy or derived work must preserve the copyright notice and this
07: * notice unmodified.
08: *
09: * 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;
35:
36: /**
37: * matches namespace nodes of an element.
38: */
39: public class FromNamespace extends Axis {
40: public FromNamespace(AbstractPattern parent) {
41: super (parent);
42:
43: if (parent == null)
44: throw new RuntimeException();
45: }
46:
47: /**
48: * matches if the node is a namespace node.
49: */
50: public boolean match(Node node, ExprEnvironment env)
51: throws XPathException {
52: if (node == null)
53: return false;
54:
55: if (!(node instanceof NamespaceNode))
56: return false;
57:
58: return _parent.match(node.getParentNode(), env);
59: }
60:
61: /**
62: * Creates a new node iterator.
63: *
64: * @param node the starting node
65: * @param env the variable environment
66: * @param match the axis match pattern
67: *
68: * @return the node iterator
69: */
70: public NodeIterator createNodeIterator(Node node,
71: ExprEnvironment env, AbstractPattern match)
72: throws XPathException {
73: NodeIterator parentIter;
74: parentIter = _parent.createNodeIterator(node, env, _parent
75: .copyPosition());
76:
77: return new NamespaceIterator(node, parentIter, env, match);
78: }
79:
80: public String toString() {
81: return getPrefix() + "namespace::";
82: }
83: }
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