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


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
33 import org.w3c.dom.Node JavaDoc;
34 import org.w3c.dom.NodeList JavaDoc;
35
36 /**
37  * Iterates through matching nodes.
38  */
39 public class SingleNodeIterator extends NodeIterator implements NodeList JavaDoc {
40   protected Node JavaDoc _node;
41
42   public SingleNodeIterator(ExprEnvironment env, Node JavaDoc node)
43   {
44     super(env);
45     
46     _node = node;
47   }
48   
49   /**
50    * Returns the current position.
51    */
52   public int getPosition()
53   {
54     return _node == null ? 1 : 0;
55   }
56   /**
57    * True if there's more data.
58    */
59   public boolean hasNext()
60   {
61     return _node != null;
62   }
63   
64   /**
65    * Returns the next node.
66    */
67   public Node JavaDoc nextNode()
68   {
69     if (_node != null) {
70       Node JavaDoc next = _node;
71       _node = null;
72       return next;
73     }
74     else
75       return null;
76   }
77
78   /**
79    * Returns the NodeList length.
80    */
81   public int getLength()
82   {
83     return _node != null ? 1 : 0;
84   }
85
86   /**
87    * Returns the NodeList item.
88    */
89   public Node JavaDoc item(int i)
90   {
91     return i == 0 ? _node : null;
92   }
93
94   /**
95    * clones the iterator
96    */
97   public Object JavaDoc clone()
98   {
99     return new SingleNodeIterator(_env, _node);
100   }
101 }
102
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