| /******************************************************************************* |
| * Copyright (c) 2006-2008 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 |
| * Brad Reynolds - bug 164653 |
| * Matthew Hall - bug 184830 |
| *******************************************************************************/ |
| |
| package org.eclipse.core.databinding.observable.map; |
| |
| 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.Diffs; |
| import org.eclipse.core.databinding.observable.Realm; |
| import org.eclipse.core.internal.databinding.Util; |
| |
| /** |
| * |
| * <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 WritableMap extends ObservableMap { |
| |
| /** |
| * Constructs a new WritableMap on the default realm. |
| */ |
| public WritableMap() { |
| this(Realm.getDefault()); |
| } |
| |
| /** |
| * Constructs a new WritableMap on the given realm. |
| * |
| * @param realm |
| * the realm |
| */ |
| public WritableMap(Realm realm) { |
| super(realm, new HashMap()); |
| } |
| |
| /** |
| * Associates the provided <code>value</code> with the <code>key</code>. Must be invoked from the current realm. |
| */ |
| public Object put(Object key, Object value) { |
| checkRealm(); |
| Object result = wrappedMap.put(key, value); |
| if (!Util.equals(result, value)) { |
| if (result==null) { |
| fireMapChange(Diffs.createMapDiffSingleAdd(key, value)); |
| } else { |
| fireMapChange(Diffs.createMapDiffSingleChange(key, result, |
| value)); |
| } |
| } |
| return result; |
| } |
| |
| /** |
| * Removes the value with the provide <code>key</code>. Must be invoked from the current realm. |
| */ |
| public Object remove(Object key) { |
| checkRealm(); |
| Object result = wrappedMap.remove(key); |
| if (result!=null) { |
| fireMapChange(Diffs.createMapDiffSingleRemove(key, result)); |
| } |
| return result; |
| } |
| |
| /** |
| * Clears the map. Must be invoked from the current realm. |
| */ |
| public void clear() { |
| checkRealm(); |
| if (!isEmpty()) { |
| Map copy = new HashMap(wrappedMap); |
| wrappedMap.clear(); |
| fireMapChange(Diffs.createMapDiffRemoveAll(copy)); |
| } |
| } |
| |
| /** |
| * Adds the provided <code>map</code>'s contents to this map. Must be invoked from the current realm. |
| */ |
| public void putAll(Map map) { |
| checkRealm(); |
| Set addedKeys = new HashSet(map.size()); |
| Map changes = new HashMap(map.size()); |
| for (Iterator it = map.entrySet().iterator(); it.hasNext();) { |
| Map.Entry entry = (Entry) it.next(); |
| Object previousValue = wrappedMap.put(entry.getKey(), entry.getValue()); |
| if (previousValue==null) { |
| addedKeys.add(entry.getKey()); |
| } else { |
| changes.put(entry.getKey(), previousValue); |
| } |
| } |
| if (!addedKeys.isEmpty() || !changes.isEmpty()) { |
| fireMapChange(Diffs.createMapDiff(addedKeys, Collections.EMPTY_SET, changes.keySet(), changes, wrappedMap)); |
| } |
| } |
| |
| } |