| /******************************************************************************* |
| * Copyright (c) 2007, 2010 BMW Car IT, Technische Universitaet Muenchen, and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * BMW Car IT - Initial API and implementation |
| * Technische Universitaet Muenchen - Major refactoring and extension |
| *******************************************************************************/ |
| package org.eclipse.emf.edapt.internal.common; |
| |
| import java.util.IdentityHashMap; |
| import java.util.Map; |
| |
| /** |
| * A map that works in both directions |
| * |
| * @author herrmama |
| * @author $Author$ |
| * @version $Rev$ |
| * @levd.rating RED Rev: |
| */ |
| public class TwoWayIdentityHashMap<K, V> extends IdentityHashMap<K, V> implements ReversableMap<K, V> { |
| |
| /** |
| * Serial version UID |
| */ |
| private static final long serialVersionUID = -3631090890347846277L; |
| |
| /** |
| * Map in the reverse direction |
| */ |
| private final Map<V, K> reverseMap = new IdentityHashMap<V, K>(); |
| |
| /** |
| * Constructor |
| */ |
| public TwoWayIdentityHashMap() { |
| super(); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public K reverseGet(V value) { |
| return reverseMap.get(value); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public V put(K key, V value) { |
| final V result = super.put(key, value); |
| reverseMap.put(value, key); |
| return result; |
| } |
| |
| /** |
| * Override for efficiency |
| */ |
| @Override |
| public boolean containsValue(Object value) { |
| return reverseMap.containsKey(value); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public V remove(Object key) { |
| final V value = super.remove(key); |
| reverseMap.remove(value); |
| return value; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public void clear() { |
| super.clear(); |
| reverseMap.clear(); |
| } |
| } |