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Java > Open Source Codes > org > objectweb > dream > util > MultipleIterator


1 /**
2  * Dream
3  * Copyright (C) 2003-2004 INRIA Rhone-Alpes
4  *
5  * This library is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU Lesser General Public
7  * License as published by the Free Software Foundation; either
8  * version 2 of the License, or (at your option) any later version.
9  *
10  * This library is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  * Lesser General Public License for more details.
14  *
15  * You should have received a copy of the GNU Lesser General Public
16  * License along with this library; if not, write to the Free Software
17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18  *
19  * Contact: dream@objectweb.org
20  *
21  * Initial developer(s): Matthieu Leclercq
22  * Contributor(s):
23  */
24
25 package org.objectweb.dream.util;
26
27 import java.util.Iterator JavaDoc;
28 import java.util.NoSuchElementException JavaDoc;
29
30 /**
31  * Iterator class that iterates over an array of iterator.
32  */
33 public class MultipleIterator implements Iterator JavaDoc
34 {
35
36   Iterator JavaDoc[] iters;
37   int i;
38
39   /**
40    * Creates a new <code>MultipleIterator</code>.
41    *
42    * @param iters the array of iterator over which this iterator will iterate.
43    */
44   public MultipleIterator(Iterator JavaDoc[] iters)
45   {
46     this.iters = iters;
47     i = 0;
48   }
49
50   /**
51    * @see java.util.Iterator#remove()
52    */
53   public void remove()
54   {
55     iters[i].remove();
56   }
57
58   /**
59    * @see java.util.Iterator#hasNext()
60    */
61   public boolean hasNext()
62   {
63     while (i < iters.length)
64     {
65       boolean hasNext = iters[i].hasNext();
66       if (hasNext)
67       {
68         return true;
69       }
70       i++;
71     }
72     return false;
73   }
74
75   /**
76    * @see java.util.Iterator#next()
77    */
78   public Object JavaDoc next()
79   {
80     if (!iters[i].hasNext())
81     {
82       i++;
83       while (i < iters.length)
84       {
85         if (iters[i].hasNext())
86         {
87           return iters[i].next();
88         }
89         i++;
90       }
91       throw new NoSuchElementException JavaDoc();
92     }
93
94     return iters[i].next();
95   }
96 }
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