001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 * 019 */ 020 package org.apache.directory.server.xdbm; 021 022 023 import java.util.Iterator; 024 025 import org.apache.directory.shared.ldap.cursor.ClosureMonitor; 026 import org.apache.directory.shared.ldap.cursor.CursorIterator; 027 import org.apache.directory.shared.ldap.cursor.DefaultClosureMonitor; 028 029 030 /** 031 * An abstract TupleCursor. 032 * 033 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 034 * @version $$Rev$$ 035 */ 036 public abstract class AbstractTupleCursor<K, V> implements TupleCursor<K, V> 037 { 038 private ClosureMonitor monitor = new DefaultClosureMonitor(); 039 040 041 public final void setClosureMonitor( ClosureMonitor monitor ) 042 { 043 if ( monitor == null ) 044 { 045 throw new NullPointerException( "monitor" ); 046 } 047 this.monitor = monitor; 048 } 049 050 051 protected final void checkNotClosed( String operation ) throws Exception 052 { 053 monitor.checkNotClosed(); 054 } 055 056 057 public final boolean isClosed() 058 { 059 return monitor.isClosed(); 060 } 061 062 063 public void close() throws Exception 064 { 065 monitor.close(); 066 } 067 068 069 public void close( Exception cause ) throws Exception 070 { 071 monitor.close( cause ); 072 } 073 074 075 public Iterator<Tuple<K, V>> iterator() 076 { 077 return new CursorIterator<Tuple<K, V>>( this ); 078 } 079 }