| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| */ |
| package org.apache.directory.server.core.avltree; |
| |
| |
| import org.apache.directory.server.i18n.I18n; |
| |
| |
| /** |
| * Stores either a single object or many of them in an AvlTree. |
| * |
| * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> |
| */ |
| public class SingletonOrOrderedSet<V> |
| { |
| private V singleton; |
| private AvlTree<V> orderedSet; |
| |
| |
| /** |
| * Creates a new instance of SingletonOrOrderedSet with a singleton value. |
| * |
| * @param singleton the singleton value |
| */ |
| public SingletonOrOrderedSet( V singleton ) |
| { |
| if ( singleton == null ) |
| { |
| throw new IllegalArgumentException( I18n.err( I18n.ERR_447 ) ); |
| } |
| |
| this.singleton = singleton; |
| } |
| |
| |
| /** |
| * Creates a new instance of SingletonOrOrderedSet with a set of ordered |
| * values. |
| * |
| * @param orderedSet the set of ordered values |
| */ |
| public SingletonOrOrderedSet( AvlTree<V> orderedSet ) |
| { |
| if ( orderedSet == null ) |
| { |
| throw new IllegalArgumentException( I18n.err( I18n.ERR_448 ) ); |
| } |
| |
| this.orderedSet = orderedSet; |
| } |
| |
| |
| /** |
| * Gets whether or not the stored value is a singleton. |
| * |
| * @return true if in singleton mode, false otherwise |
| */ |
| public boolean isSingleton() |
| { |
| return singleton != null; |
| } |
| |
| |
| /** |
| * Gets whether or not the stored value is an ordered set. |
| * |
| * @return true if in ordered set mode, false otherwise |
| */ |
| public boolean isOrderedSet() |
| { |
| return orderedSet != null; |
| } |
| |
| |
| /** |
| * Gets the singleton value. |
| * |
| * @return the singleton value |
| * @exception RuntimeException if not in singleton mode |
| */ |
| public V getSingleton() |
| { |
| if ( singleton != null ) |
| { |
| return singleton; |
| } |
| |
| throw new RuntimeException( I18n.err( I18n.ERR_449 ) ); |
| } |
| |
| |
| /** |
| * Sets the singleton if in singleton mode. |
| * |
| * @param singleton the singleton value to set |
| * @return old single value |
| */ |
| public V setSingleton( V singleton ) |
| { |
| if ( singleton == null ) |
| { |
| throw new IllegalArgumentException( I18n.err( I18n.ERR_447 ) ); |
| } |
| |
| if ( this.orderedSet != null ) |
| { |
| throw new RuntimeException( I18n.err( I18n.ERR_450 ) ); |
| } |
| |
| V retval = this.singleton; |
| this.singleton = singleton; |
| return retval; |
| } |
| |
| |
| /** |
| * Switches from orderedSet mode to singleton mode, while returning the |
| * ordered set of values before removing them forever. |
| * |
| * @param singleton the singleton value |
| * @return the set of ordered values before nulling it out |
| * @exception RuntimeException if already in singleton mode |
| */ |
| public AvlTree<V> switchToSingleton( V singleton ) |
| { |
| if ( singleton == null ) |
| { |
| throw new IllegalArgumentException( I18n.err( I18n.ERR_447 ) ); |
| } |
| |
| if ( this.singleton != null ) |
| { |
| throw new RuntimeException( I18n.err( I18n.ERR_451 ) ); |
| } |
| |
| AvlTree<V> retval = this.orderedSet; |
| this.orderedSet = null; |
| this.singleton = singleton; |
| return retval; |
| } |
| |
| |
| /** |
| * Gets the ordered set. |
| * |
| * @return the ordered set |
| * @exception RuntimeException if in singleton mode |
| */ |
| public AvlTree<V> getOrderedSet() |
| { |
| if ( orderedSet != null ) |
| { |
| return orderedSet; |
| } |
| |
| throw new RuntimeException( I18n.err( I18n.ERR_452 ) ); |
| } |
| |
| |
| /** |
| * Sets the set of ordered values. |
| * |
| * @param orderedSet the set of ordered values to use |
| * @return the old set of ordered values |
| * @exception RuntimeException if in singleton mode |
| */ |
| public AvlTree<V> setOrderedSet( AvlTree<V> orderedSet ) |
| { |
| if ( orderedSet == null ) |
| { |
| throw new IllegalArgumentException( I18n.err( I18n.ERR_448 ) ); |
| } |
| |
| if ( this.singleton != null ) |
| { |
| throw new RuntimeException( I18n.err( I18n.ERR_453 ) ); |
| } |
| |
| AvlTree<V> retval = this.orderedSet; |
| this.orderedSet = orderedSet; |
| return retval; |
| } |
| |
| |
| /** |
| * Switches from orderedSet mode to singleton mode, while returning the |
| * singleton value before removing it forever. |
| * |
| * @param orderedSet the AvlTree to use for orderedSet of values |
| * @return the singleton to return before nulling it out |
| * @throws RuntimeException if the mode is already in orderedSet mode. |
| */ |
| public V switchToOrderedSet( AvlTree<V> orderedSet ) |
| { |
| if ( orderedSet == null ) |
| { |
| throw new IllegalArgumentException( I18n.err( I18n.ERR_448 ) ); |
| } |
| |
| if ( this.orderedSet != null ) |
| { |
| throw new RuntimeException( I18n.err( I18n.ERR_454 ) ); |
| } |
| |
| V retval = this.singleton; |
| this.orderedSet = orderedSet; |
| this.singleton = null; |
| return retval; |
| } |
| } |