| /******************************************************************************* |
| * Copyright (c) 2003, 2005 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 |
| *******************************************************************************/ |
| package org.eclipse.wst.common.componentcore.internal; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.eclipse.emf.common.notify.Notification; |
| import org.eclipse.emf.common.notify.impl.AdapterImpl; |
| import org.eclipse.wst.common.internal.emfworkbench.integration.EditModelEvent; |
| |
| public class GlobalComponentChangeNotifier extends AdapterImpl implements GlobalComponentChangeListener { |
| |
| private static GlobalComponentChangeNotifier instance; |
| |
| private List listeners; |
| private List removedListeners = new ArrayList(); |
| private boolean isNotifing = false; |
| private static final int EMF_EVENT = 0; |
| private static final int EDIT_EVENT = 1; |
| |
| public static GlobalComponentChangeNotifier getInstance() { |
| if (instance == null) { |
| instance = new GlobalComponentChangeNotifier(); |
| } |
| return instance; |
| } |
| |
| public void notifyChanged(Notification notification) { |
| notifyListeners(EMF_EVENT, notification); |
| } |
| |
| |
| public void editModelChanged(EditModelEvent anEvent) { |
| notifyListeners(EDIT_EVENT, anEvent); |
| } |
| |
| public void addListener(GlobalComponentChangeListener aListener) { |
| if (aListener != null && !getListeners().contains(aListener)) |
| getListeners().add(aListener); |
| } |
| |
| public synchronized boolean removeListener(GlobalComponentChangeListener aListener) { |
| if (aListener != null) { |
| if (isNotifing) |
| return removedListeners.add(aListener); |
| return getListeners().remove(aListener); |
| } |
| return false; |
| } |
| |
| private java.util.List getListeners() { |
| if (listeners == null) |
| listeners = new ArrayList(); |
| return listeners; |
| } |
| |
| private void notifyListeners(int eventKind, Object anEvent) { |
| if (listeners == null) |
| return; |
| boolean oldIsNotifying = isNotifing; |
| synchronized (this) { |
| isNotifing = true; |
| } |
| try { |
| List list = getListeners(); |
| for (int i = 0; i < list.size(); i++) { |
| GlobalComponentChangeListener listener = (GlobalComponentChangeListener) list.get(i); |
| if (!removedListeners.contains(listener)){ |
| switch(eventKind){ |
| case EMF_EVENT: |
| listener.notifyChanged((Notification)anEvent); |
| break; |
| case EDIT_EVENT: |
| listener.editModelChanged((EditModelEvent)anEvent); |
| break; |
| } |
| } |
| } |
| } finally { |
| synchronized (this) { |
| isNotifing = oldIsNotifying; |
| if (!isNotifing && removedListeners != null && !removedListeners.isEmpty()) { |
| listeners.removeAll(removedListeners); |
| removedListeners.clear(); |
| } |
| } |
| } |
| } |
| |
| } |