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 */
20 package org.apache.directory.server.xdbm;
21
22
23 import org.apache.directory.server.core.cursor.ClosureMonitor;
24 import org.apache.directory.server.core.cursor.CursorIterator;
25 import org.apache.directory.server.core.cursor.DefaultClosureMonitor;
26
27 import java.util.Iterator;
28
29
30 /**
31 * An abstract TupleCursor.
32 *
33 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
34 * @version $$Rev$$
35 */
36 public abstract class AbstractTupleCursor<K,V> implements TupleCursor<K,V>
37 {
38 private ClosureMonitor monitor = new DefaultClosureMonitor();
39
40
41 public final void setClosureMonitor( ClosureMonitor monitor )
42 {
43 if ( monitor == null )
44 {
45 throw new NullPointerException( "monitor" );
46 }
47 this.monitor = monitor;
48 }
49
50
51 protected final void checkNotClosed( String operation ) throws Exception
52 {
53 monitor.checkNotClosed();
54 }
55
56
57 public final boolean isClosed()
58 {
59 return monitor.isClosed();
60 }
61
62
63 public void close() throws Exception
64 {
65 monitor.close();
66 }
67
68
69 public void close( Exception cause ) throws Exception
70 {
71 monitor.close( cause );
72 }
73
74
75 public Iterator<Tuple<K,V>> iterator()
76 {
77 return new CursorIterator<Tuple<K,V>>( this );
78 }
79 }