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.core.partition.impl.btree.jdbm; 021 022 023 import org.apache.directory.server.core.avltree.ArrayTree; 024 import org.apache.directory.server.i18n.I18n; 025 026 027 /** 028 * A wrapper around duplicate key values. This class wraps either an AvlTree 029 * or a BTreeRedirect. The AvlTree and BTreeRedirect forms are used for the 030 * two value persistence mechanisms used to implement duplicate keys over JDBM 031 * btrees. 032 * 033 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 034 * @version $Rev$ 035 */ 036 public class DupsContainer<V> 037 { 038 private final ArrayTree<V> arrayTree; 039 private final BTreeRedirect btreeRedirect; 040 041 042 DupsContainer( ArrayTree<V> arrayTree ) 043 { 044 this.arrayTree = arrayTree; 045 btreeRedirect = null; 046 } 047 048 049 DupsContainer( BTreeRedirect btreeRedirect ) 050 { 051 arrayTree = null; 052 this.btreeRedirect = btreeRedirect; 053 } 054 055 056 final boolean isBTreeRedirect() 057 { 058 return btreeRedirect != null; 059 } 060 061 062 final boolean isArrayTree() 063 { 064 return arrayTree != null; 065 } 066 067 068 final ArrayTree<V> getArrayTree() 069 { 070 if ( arrayTree == null ) 071 { 072 throw new IllegalStateException( I18n.err( I18n.ERR_570 ) ); 073 } 074 075 return arrayTree; 076 } 077 078 079 final BTreeRedirect getBTreeRedirect() 080 { 081 if ( btreeRedirect == null ) 082 { 083 throw new IllegalStateException( I18n.err( I18n.ERR_571 ) ); 084 } 085 086 return btreeRedirect; 087 } 088 }