Mercurial > projects > dwt2
view org.eclipse.core.databinding.observable/src/org/eclipse/core/databinding/observable/map/BidirectionalMap.d @ 97:c86eb8b3098e
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author | Frank Benoit <benoit@tionex.de> |
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date | Tue, 21 Apr 2009 11:18:25 +0200 |
parents | b74ac5dfcc06 |
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/******************************************************************************* * Copyright (c) 2006, 2007 IBM Corporation 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: * IBM Corporation - initial API and implementation *******************************************************************************/ module org.eclipse.core.databinding.observable.map.BidirectionalMap; import org.eclipse.core.databinding.observable.map.MapDiff; import org.eclipse.core.databinding.observable.map.ObservableMap; import org.eclipse.core.databinding.observable.map.MapChangeEvent; import org.eclipse.core.databinding.observable.map.IMapChangeListener; import org.eclipse.core.databinding.observable.map.IObservableMap; import java.lang.all; import java.util.Collections; import java.util.HashMap; import java.util.HashSet; import java.util.Iterator; import java.util.Map; import java.util.Set; import org.eclipse.core.databinding.observable.Realm; /** * * <p> * This class is thread safe. All state accessing methods must be invoked from * the {@link Realm#isCurrent() current realm}. Methods for adding and removing * listeners may be invoked from any thread. * </p> * @since 1.0 * */ public class BidirectionalMap : ObservableMap { private Map valueToElements = new HashMap(); private IMapChangeListener mapListener = new class() IMapChangeListener { public void handleMapChange(MapChangeEvent event) { MapDiff diff = event.diff; for (Iterator it = diff.getAddedKeys().iterator(); it.hasNext();) { Object addedKey = it.next(); addMapping(addedKey, diff.getNewValue(addedKey)); } for (Iterator it = diff.getChangedKeys().iterator(); it.hasNext();) { Object changedKey = it.next(); removeMapping(changedKey, diff.getOldValue(changedKey)); addMapping(changedKey, diff.getNewValue(changedKey)); } for (Iterator it = diff.getRemovedKeys().iterator(); it.hasNext();) { Object removedKey = it.next(); removeMapping(removedKey, diff.getOldValue(removedKey)); } fireMapChange(diff); } }; /** * @param wrappedMap */ public this(IObservableMap wrappedMap) { super(wrappedMap.getRealm(), wrappedMap); wrappedMap.addMapChangeListener(mapListener); for (Iterator it = wrappedMap.entrySet().iterator(); it.hasNext();) { Map.Entry entry = cast(Entry) it.next(); addMapping(entry.getKey(), entry.getValue()); } } /** * @param key * @param value */ private void addMapping(Object key, Object value) { Object elementOrSet = valueToElements.get(value); if (elementOrSet is null) { valueToElements.put(value, key); return; } if (!( null !is cast(Set)elementOrSet )) { elementOrSet = new HashSet(Collections.singleton(elementOrSet)); valueToElements.put(value, elementOrSet); } Set set = cast(Set) elementOrSet; set.add(key); } /** * @param functionValue * @param element */ private void removeMapping(Object functionValue, Object element) { Object elementOrSet = valueToElements.get(functionValue); if ( null !is cast(Set)elementOrSet ) { Set set = cast(Set) elementOrSet; set.remove(element); if (set.size() is 0) { valueToElements.remove(functionValue); } } else { valueToElements.remove(functionValue); } } }