| /* |
| * Copyright 2003-2004 The Apache Software Foundation |
| * |
| * Licensed 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.commons.collections.bidimap; |
| |
| import java.util.Collection; |
| import java.util.Map; |
| import java.util.Set; |
| |
| import org.apache.commons.collections.BidiMap; |
| import org.apache.commons.collections.MapIterator; |
| import org.apache.commons.collections.Unmodifiable; |
| import org.apache.commons.collections.collection.UnmodifiableCollection; |
| import org.apache.commons.collections.iterators.UnmodifiableMapIterator; |
| import org.apache.commons.collections.map.UnmodifiableEntrySet; |
| import org.apache.commons.collections.set.UnmodifiableSet; |
| |
| /** |
| * Decorates another <code>BidiMap</code> to ensure it can't be altered. |
| * |
| * @since Commons Collections 3.0 |
| * @version $Revision: 1.1 $ $Date: 2009/05/27 22:16:32 $ |
| * |
| * @author Stephen Colebourne |
| */ |
| public final class UnmodifiableBidiMap |
| extends AbstractBidiMapDecorator implements Unmodifiable { |
| |
| /** The inverse unmodifiable map */ |
| private UnmodifiableBidiMap inverse; |
| |
| /** |
| * Factory method to create an unmodifiable map. |
| * <p> |
| * If the map passed in is already unmodifiable, it is returned. |
| * |
| * @param map the map to decorate, must not be null |
| * @return an unmodifiable BidiMap |
| * @throws IllegalArgumentException if map is null |
| */ |
| public static BidiMap decorate(BidiMap map) { |
| if (map instanceof Unmodifiable) { |
| return map; |
| } |
| return new UnmodifiableBidiMap(map); |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Constructor that wraps (not copies). |
| * |
| * @param map the map to decorate, must not be null |
| * @throws IllegalArgumentException if map is null |
| */ |
| private UnmodifiableBidiMap(BidiMap map) { |
| super(map); |
| } |
| |
| //----------------------------------------------------------------------- |
| public void clear() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public Object put(Object key, Object value) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public void putAll(Map mapToCopy) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public Object remove(Object key) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public Set entrySet() { |
| Set set = super.entrySet(); |
| return UnmodifiableEntrySet.decorate(set); |
| } |
| |
| public Set keySet() { |
| Set set = super.keySet(); |
| return UnmodifiableSet.decorate(set); |
| } |
| |
| public Collection values() { |
| Collection coll = super.values(); |
| return UnmodifiableCollection.decorate(coll); |
| } |
| |
| //----------------------------------------------------------------------- |
| public Object removeValue(Object value) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public MapIterator mapIterator() { |
| MapIterator it = getBidiMap().mapIterator(); |
| return UnmodifiableMapIterator.decorate(it); |
| } |
| |
| public BidiMap inverseBidiMap() { |
| if (inverse == null) { |
| inverse = new UnmodifiableBidiMap(getBidiMap().inverseBidiMap()); |
| inverse.inverse = this; |
| } |
| return inverse; |
| } |
| |
| } |