1 /*
2 * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/util/LinkedIterator.java,v 1.8 2006/11/09 18:20:12 elharo Exp $
3 * $Revision: 1.8 $
4 * $Date: 2006/11/09 18:20:12 $
5 *
6 * ====================================================================
7 *
8 * Copyright 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 are
13 * met:
14 *
15 * * Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 *
18 * * Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 *
22 * * Neither the name of the Jaxen Project nor the names of its
23 * contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
27 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
29 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
30 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
31 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
32 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
33 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
34 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
35 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
36 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
37 *
38 * ====================================================================
39 * This software consists of voluntary contributions made by many
40 * individuals on behalf of the Jaxen Project and was originally
41 * created by bob mcwhirter <bob@werken.com> and
42 * James Strachan <jstrachan@apache.org>. For more information on the
43 * Jaxen Project, please see <http://www.jaxen.org/>.
44 *
45 * $Id: LinkedIterator.java,v 1.8 2006/11/09 18:20:12 elharo Exp $
46 */
47
48
49 package org.jaxen.util;
50
51 import java.util.ArrayList;
52 import java.util.Iterator;
53 import java.util.List;
54 import java.util.NoSuchElementException;
55
56 /***
57 * @deprecated This class is undocumented and untested.
58 * It will be removed in a future release.
59 */
60 public class LinkedIterator implements Iterator
61 {
62 private List iterators;
63 private int cur;
64
65 public LinkedIterator()
66 {
67 this.iterators = new ArrayList();
68 this.cur = 0;
69 }
70
71 public void addIterator(Iterator i)
72 {
73 this.iterators.add( i );
74 }
75
76 public boolean hasNext()
77 {
78 boolean has = false;
79
80 if ( this.cur < this.iterators.size() )
81 {
82 has = ((Iterator)this.iterators.get( this.cur )).hasNext();
83
84 if ( ! has
85 &&
86 this.cur < this.iterators.size() )
87 {
88 ++this.cur;
89 has = hasNext();
90 }
91 }
92 else
93 {
94 has = false;
95 }
96
97 return has;
98 }
99
100 public Object next()
101 {
102 if ( ! hasNext() )
103 {
104 throw new NoSuchElementException();
105 }
106
107 return ((Iterator)this.iterators.get( this.cur )).next();
108 }
109
110 /***
111 * This operation is not supported.
112 *
113 * @throws UnsupportedOperationException
114 */
115 public void remove()
116 {
117 throw new UnsupportedOperationException();
118 }
119 }