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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 }