- /*
- * 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: 1.5 $ $Date: 2004/05/15 12:13:03 $
- *
- * @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;
- }
-
- }