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1   /*
2    * $Header$
3    * $Revision: 1255 $
4    * $Date: 2006-11-09 10:20:12 -0800 (Thu, 09 Nov 2006) $
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 1255 2006-11-09 18:20:12Z elharo $
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 }