1 /*
2 * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/util/LinkedIterator.java,v 1.6 2005/09/24 19:27:31 elharo Exp $
3 * $Revision: 1.6 $
4 * $Date: 2005/09/24 19:27:31 $
5 *
6 * ====================================================================
7 *
8 * Copyright (C) 2000-2002 bob mcwhirter & James Strachan.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 *
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions, and the following disclaimer.
17 *
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions, and the disclaimer that follows
20 * these conditions in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * 3. The name "Jaxen" must not be used to endorse or promote products
24 * derived from this software without prior written permission. For
25 * written permission, please contact license@jaxen.org.
26 *
27 * 4. Products derived from this software may not be called "Jaxen", nor
28 * may "Jaxen" appear in their name, without prior written permission
29 * from the Jaxen Project Management (pm@jaxen.org).
30 *
31 * In addition, we request (but do not require) that you include in the
32 * end-user documentation provided with the redistribution and/or in the
33 * software itself an acknowledgement equivalent to the following:
34 * "This product includes software developed by the
35 * Jaxen Project <http://www.jaxen.org/>."
36 * Alternatively, the acknowledgment may be graphical using the logos
37 * available at http://www.jaxen.org/
38 *
39 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
40 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
41 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
42 * DISCLAIMED. IN NO EVENT SHALL THE Jaxen AUTHORS OR THE PROJECT
43 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
45 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
46 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
47 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
48 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
49 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50 * SUCH DAMAGE.
51 *
52 * ====================================================================
53 * This software consists of voluntary contributions made by many
54 * individuals on behalf of the Jaxen Project and was originally
55 * created by bob mcwhirter <bob@werken.com> and
56 * James Strachan <jstrachan@apache.org>. For more information on the
57 * Jaxen Project, please see <http://www.jaxen.org/>.
58 *
59 * $Id: LinkedIterator.java,v 1.6 2005/09/24 19:27:31 elharo Exp $
60 */
61
62
63 package org.jaxen.util;
64
65 import java.util.ArrayList;
66 import java.util.Iterator;
67 import java.util.List;
68 import java.util.NoSuchElementException;
69
70 /***
71 * @deprecated elharo this class is undocumented and untested.
72 * It will be removed in a future release.
73 */
74 public class LinkedIterator implements Iterator
75 {
76 private List iterators;
77 private int cur;
78
79 public LinkedIterator()
80 {
81 this.iterators = new ArrayList();
82 this.cur = 0;
83 }
84
85 public void addIterator(Iterator i)
86 {
87 this.iterators.add( i );
88 }
89
90 public boolean hasNext()
91 {
92 boolean has = false;
93
94 if ( this.cur < this.iterators.size() )
95 {
96 has = ((Iterator)this.iterators.get( this.cur )).hasNext();
97
98 if ( ! has
99 &&
100 this.cur < this.iterators.size() )
101 {
102 ++this.cur;
103 has = hasNext();
104 }
105 }
106 else
107 {
108 has = false;
109 }
110
111 return has;
112 }
113
114 public Object next()
115 {
116 if ( ! hasNext() )
117 {
118 throw new NoSuchElementException();
119 }
120
121 return ((Iterator)this.iterators.get( this.cur )).next();
122 }
123
124 public void remove()
125 {
126 throw new UnsupportedOperationException();
127 }
128 }