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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *  http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  package org.apache.directory.server.core.cursor;
20  
21  
22  import java.util.Iterator;
23  
24  
25  /**
26   * Simple class that contains often used Cursor code.
27   *
28   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
29   * @version $Rev$, $Date$
30   */
31  public abstract class AbstractCursor<E> implements Cursor<E>
32  {
33      private ClosureMonitor monitor = new DefaultClosureMonitor();
34  
35      
36      public final void setClosureMonitor( ClosureMonitor monitor )
37      {
38          if ( monitor == null )
39          {
40              throw new NullPointerException( "monitor" );
41          }
42          
43          this.monitor = monitor;
44      }
45      
46  
47      protected final void checkNotClosed( String operation ) throws Exception
48      {
49          monitor.checkNotClosed();
50      }
51  
52  
53      public final boolean isClosed()
54      {
55          return monitor.isClosed();
56      }
57  
58  
59      public void close( Exception cause ) throws Exception
60      {
61          monitor.close( cause );
62      }
63  
64  
65      public void close() throws Exception
66      {
67          monitor.close();
68      }
69  
70  
71      public Iterator<E> iterator()
72      {
73          return new CursorIterator<E>( this );
74      }
75  }