ArrayIterator


1   // Copyright 2004, 2005 The Apache Software Foundation
2   //
3   // Licensed under the Apache License, Version 2.0 (the "License");
4   // you may not use this file except in compliance with the License.
5   // You may obtain a copy of the License at
6   //
7   //     http://www.apache.org/licenses/LICENSE-2.0
8   //
9   // Unless required by applicable law or agreed to in writing, software
10  // distributed under the License is distributed on an "AS IS" BASIS,
11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  // See the License for the specific language governing permissions and
13  // limitations under the License.
14  
15  package org.apache.tapestry.contrib.table.model.common;
16  
17  import java.util.Iterator  ;
18  import java.util.NoSuchElementException  ;
19  
20  /**
21   * @author mindbridge
22   */
23  public class ArrayIterator implements Iterator  
24  {
25      private Object  [] m_arrValues;
26      private int m_nFrom;
27      private int m_nTo;
28      private int m_nCurrent;
29  
30      public ArrayIterator(Object  [] arrValues)
31      {
32          this(arrValues, 0, arrValues.length);
33      }
34  
35      public ArrayIterator(Object  [] arrValues, int nFrom, int nTo)
36      {
37          m_arrValues = arrValues;
38          m_nFrom = nFrom;
39          m_nTo = nTo;
40  
41          if (m_nFrom < 0)
42              m_nFrom = 0;
43          if (m_nTo < m_nFrom)
44              m_nTo = m_nFrom;
45          if (m_nTo > m_arrValues.length)
46              m_nTo = m_arrValues.length;
47  
48          m_nCurrent = m_nFrom;
49      }
50  
51      /**
52       * @see java.util.Iterator#hasNext()
53       */
54      public boolean hasNext()
55      {
56          return m_nCurrent < m_nTo;
57      }
58  
59      /**
60       * @see java.util.Iterator#next()
61       */
62      public Object   next()
63      {
64          //System.out.println("index: " + m_nCurrent + "   size: " + m_arrValues.length + "  to: " + m_nTo);
65          if (!hasNext())
66              throw new NoSuchElementException  ();
67          return m_arrValues[m_nCurrent++];
68      }
69  
70      /**
71       * @see java.util.Iterator#remove()
72       */
73      public void remove()
74      {
75          throw new UnsupportedOperationException  ();
76      }
77  
78  }
79
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