AbstractRangeIterator


1   /*
2    * Copyright (C) 2005 Alfresco, Inc.
3    *
4    * Licensed under the Mozilla Public License version 1.1 
5    * with a permitted attribution clause. You may obtain a
6    * copy of the License at
7    *
8    *   http://www.alfresco.org/legal/license.txt
9    *
10   * Unless required by applicable law or agreed to in writing,
11   * software distributed under the License is distributed on an
12   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
13   * either express or implied. See the License for the specific
14   * language governing permissions and limitations under the
15   * License.
16   */
17  package org.alfresco.jcr.util;
18  
19  import java.util.NoSuchElementException  ;
20  
21  import javax.jcr.RangeIterator;
22  
23  
24  /**
25   * Alfresco implementation of a Node Iterator
26   * 
27   * @author David Caruana
28   */
29  public abstract class AbstractRangeIterator implements RangeIterator
30  {
31      private int position = -1;
32      
33      /**
34       * Construct
35       * 
36       * @param context  session context
37       * @param nodes  node list
38       */
39      public AbstractRangeIterator()
40      {
41      }
42  
43      /**
44       * Skip 1 position
45       * 
46       * @return  current position
47       */
48      protected long skip()
49      {
50          skip(1);
51          return position;
52      }
53          
54      /* (non-Javadoc)
55       * @see javax.jcr.RangeIterator#skip(long)
56       */
57      public void skip(long skipNum)
58      {
59          if (skipNum < 0)
60          {
61              throw new IllegalArgumentException  ("skipNum must be positive.");
62          }
63          if (position + skipNum >= getSize())
64          {
65              throw new NoSuchElementException  ("Cannot skip " + skipNum + " elements from position " + getPosition() + " as only " + getSize() + " elements are available.");
66          }
67          position += skipNum;
68      }
69  
70      /* (non-Javadoc)
71       * @see javax.jcr.RangeIterator#getPosition()
72       */
73      public long getPosition()
74      {
75          return position + 1;
76      }
77  
78      /* (non-Javadoc)
79       * @see java.util.Iterator#hasNext()
80       */
81      public boolean hasNext()
82      {
83          return getPosition() < getSize();
84      }
85  
86      /* (non-Javadoc)
87       * @see java.util.Iterator#remove()
88       */
89      public void remove()
90      {
91          throw new UnsupportedOperationException  ();
92      }
93  
94  }
95
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