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 }