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


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 import java.util.logging.Level JavaDoc;
37
38 /**
39  * Uses the axis to select new nodes.
40  */
41 public class AttributeIterator extends AxisIterator {
42   private AttributeIterator(ExprEnvironment env)
43   {
44     super(env);
45   }
46   /**
47    * Creates the new AxisIterator.
48    *
49    * @param parentIter the parent iterator
50    * @param axis the owning axis
51    * @param node the first node
52    * @param env the xpath environment
53    * @param context the context node
54    * @param match the node matching pattern
55    */
56   public AttributeIterator(NodeIterator parentIter, AbstractPattern axis,
57                            Node JavaDoc node, ExprEnvironment env,
58                            AbstractPattern match)
59     throws XPathException
60   {
61     super(parentIter, axis, node, env, match);
62   }
63   
64   /**
65    * Returns the next selected node.
66    */
67   public SelectedNode nextSelectedNode()
68     throws XPathException
69   {
70     Node JavaDoc node = nextNode();
71
72     return node == null ? null : new SelectedAttribute(node);
73   }
74
75   public Object JavaDoc clone()
76   {
77     try {
78       AttributeIterator iter = new AttributeIterator(_env);
79
80       iter._position = _position;
81       if (_parentIter != null)
82         iter._parentIter = (NodeIterator) _parentIter.clone();
83       iter._axis = _axis;
84       iter._node = _node;
85       iter._env = _env; // clone?
86 iter._match = _match;
87
88       return iter;
89     } catch (Exception JavaDoc e) {
90       log.log(Level.FINE, e.toString(), e);
91
92       return null;
93     }
94   }
95
96   public String JavaDoc toString()
97   {
98     return "AttributeIterator[axis:" + _axis + ",match:" + _match + "]";
99   }
100 }
101
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