| /******************************************************************************* |
| * 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 |
| * Brad Reynolds - bug 164653 |
| *******************************************************************************/ |
| |
| package org.eclipse.core.databinding.observable.map; |
| |
| import java.util.AbstractMap; |
| |
| import org.eclipse.core.databinding.observable.ChangeEvent; |
| import org.eclipse.core.databinding.observable.ChangeSupport; |
| import org.eclipse.core.databinding.observable.IChangeListener; |
| import org.eclipse.core.databinding.observable.IStaleListener; |
| import org.eclipse.core.databinding.observable.Realm; |
| import org.eclipse.core.databinding.observable.StaleEvent; |
| import org.eclipse.core.runtime.Assert; |
| import org.eclipse.core.runtime.AssertionFailedException; |
| |
| /** |
| * |
| * <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 abstract class AbstractObservableMap extends AbstractMap implements |
| IObservableMap { |
| |
| private ChangeSupport changeSupport; |
| |
| private boolean stale; |
| |
| /** |
| */ |
| public AbstractObservableMap() { |
| this(Realm.getDefault()); |
| } |
| |
| /** |
| * |
| */ |
| protected void lastListenerRemoved() { |
| } |
| |
| /** |
| * |
| */ |
| protected void firstListenerAdded() { |
| } |
| |
| /** |
| * @param realm |
| */ |
| public AbstractObservableMap(Realm realm) { |
| Assert.isNotNull(realm); |
| changeSupport = new ChangeSupport(realm){ |
| protected void firstListenerAdded() { |
| AbstractObservableMap.this.firstListenerAdded(); |
| } |
| protected void lastListenerRemoved() { |
| AbstractObservableMap.this.lastListenerRemoved(); |
| } |
| }; |
| } |
| |
| public synchronized void addMapChangeListener(IMapChangeListener listener) { |
| changeSupport.addListener(MapChangeEvent.TYPE, listener); |
| } |
| |
| public synchronized void removeMapChangeListener(IMapChangeListener listener) { |
| changeSupport.removeListener(MapChangeEvent.TYPE, listener); |
| } |
| |
| public synchronized void addChangeListener(IChangeListener listener) { |
| changeSupport.addChangeListener(listener); |
| } |
| |
| public synchronized void addStaleListener(IStaleListener listener) { |
| changeSupport.addStaleListener(listener); |
| } |
| |
| public synchronized void dispose() { |
| changeSupport.dispose(); |
| changeSupport = null; |
| } |
| |
| public Realm getRealm() { |
| return changeSupport.getRealm(); |
| } |
| |
| public boolean isStale() { |
| checkRealm(); |
| return stale; |
| } |
| |
| public synchronized void removeChangeListener(IChangeListener listener) { |
| changeSupport.removeChangeListener(listener); |
| } |
| |
| public synchronized void removeStaleListener(IStaleListener listener) { |
| changeSupport.removeStaleListener(listener); |
| } |
| |
| /** |
| * Sets the stale state. Must be invoked from the current realm. |
| * |
| * @param stale |
| */ |
| public void setStale(boolean stale) { |
| checkRealm(); |
| this.stale = stale; |
| if (stale) { |
| fireStale(); |
| } |
| } |
| |
| /** |
| * Fires stale events. Must be invoked from current realm. |
| */ |
| protected void fireStale() { |
| checkRealm(); |
| changeSupport.fireEvent(new StaleEvent(this)); |
| } |
| |
| /** |
| * Fires change events. Must be invoked from current realm. |
| */ |
| protected void fireChange() { |
| checkRealm(); |
| changeSupport.fireEvent(new ChangeEvent(this)); |
| } |
| |
| /** |
| * Fires map change events. Must be invoked from current realm. |
| * |
| * @param diff |
| */ |
| protected void fireMapChange(MapDiff diff) { |
| checkRealm(); |
| changeSupport.fireEvent(new MapChangeEvent(this, diff)); |
| } |
| |
| /** |
| * Asserts that the realm is the current realm. |
| * |
| * @see Realm#isCurrent() |
| * @throws AssertionFailedException |
| * if the realm is not the current realm |
| */ |
| protected void checkRealm() { |
| Assert.isTrue(getRealm().isCurrent()); |
| } |
| } |