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/*
 * 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.commons.collections4.bidimap;

import java.util.Map;
import java.util.Set;

import org.apache.commons.collections4.BidiMap;
import org.apache.commons.collections4.MapIterator;
import org.apache.commons.collections4.Unmodifiable;
import org.apache.commons.collections4.iterators.UnmodifiableMapIterator;
import org.apache.commons.collections4.map.UnmodifiableEntrySet;
import org.apache.commons.collections4.set.UnmodifiableSet;

/**
 * Decorates another {@link BidiMap} to ensure it can't be altered.
 * 

* Attempts to modify it will result in an UnsupportedOperationException. * * @since 3.0 * @version $Id: UnmodifiableBidiMap.java 1686855 2015-06-22 13:00:27Z tn $ */ public final class UnmodifiableBidiMap extends AbstractBidiMapDecorator implements Unmodifiable { /** The inverse unmodifiable map */ private UnmodifiableBidiMap inverse; /** * Factory method to create an unmodifiable map. *

* If the map passed in is already unmodifiable, it is returned. * * @param the key type * @param the value type * @param map the map to decorate, must not be null * @return an unmodifiable BidiMap * @throws NullPointerException if map is null * @since 4.0 */ public static BidiMap unmodifiableBidiMap(final BidiMap map) { if (map instanceof Unmodifiable) { @SuppressWarnings("unchecked") // safe to upcast final BidiMap tmpMap = (BidiMap) map; return tmpMap; } return new UnmodifiableBidiMap(map); } //----------------------------------------------------------------------- /** * Constructor that wraps (not copies). * * @param map the map to decorate, must not be null * @throws NullPointerException if map is null */ @SuppressWarnings("unchecked") // safe to upcast private UnmodifiableBidiMap(final BidiMap map) { super((BidiMap) map); } //----------------------------------------------------------------------- @Override public void clear() { throw new UnsupportedOperationException(); } @Override public V put(final K key, final V value) { throw new UnsupportedOperationException(); } @Override public void putAll(final Map mapToCopy) { throw new UnsupportedOperationException(); } @Override public V remove(final Object key) { throw new UnsupportedOperationException(); } @Override public Set> entrySet() { final Set> set = super.entrySet(); return UnmodifiableEntrySet.unmodifiableEntrySet(set); } @Override public Set keySet() { final Set set = super.keySet(); return UnmodifiableSet.unmodifiableSet(set); } @Override public Set values() { final Set set = super.values(); return UnmodifiableSet.unmodifiableSet(set); } //----------------------------------------------------------------------- @Override public K removeValue(final Object value) { throw new UnsupportedOperationException(); } @Override public MapIterator mapIterator() { final MapIterator it = decorated().mapIterator(); return UnmodifiableMapIterator.unmodifiableMapIterator(it); } @Override public synchronized BidiMap inverseBidiMap() { if (inverse == null) { inverse = new UnmodifiableBidiMap(decorated().inverseBidiMap()); inverse.inverse = this; } return inverse; } }





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