| /******************************************************************************* |
| * Copyright (c) 2004, 2006 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.ui.internal.preferences; |
| |
| import java.util.ArrayList; |
| |
| /** |
| * @since 3.1 |
| */ |
| public abstract class PropertyMapAdapter implements IDynamicPropertyMap { |
| |
| private PropertyListenerList listeners; |
| private int ignoreCount = 0; |
| private ArrayList queuedEvents = new ArrayList(); |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.ui.internal.preferences.IDynamicPropertyMap#addListener(org.eclipse.ui.internal.preferences.IPropertyMapListener) |
| */ |
| public final void addListener(IPropertyMapListener listener) { |
| if (listeners == null) { |
| listeners = new PropertyListenerList(); |
| attachListener(); |
| } |
| listeners.add(listener); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.ui.internal.preferences.IDynamicPropertyMap#removeListener(org.eclipse.ui.internal.preferences.IPropertyMapListener) |
| */ |
| public final void removeListener(IPropertyMapListener listener) { |
| if (listeners != null) { |
| listeners.remove(listener); |
| if (listeners.isEmpty()) { |
| detachListener(); |
| listeners = null; |
| } |
| } |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.ui.internal.preferences.IPropertyMap#isCommonProperty(java.lang.String) |
| */ |
| public final boolean isCommonProperty(String propertyId) { |
| return true; |
| } |
| |
| /** |
| * Detaches all listeners which have been registered with other objects |
| * |
| * @since 3.1 |
| */ |
| public void dispose() { |
| if (listeners != null) { |
| detachListener(); |
| listeners = null; |
| } |
| } |
| |
| protected final void firePropertyChange(String prefId) { |
| if (ignoreCount > 0) { |
| queuedEvents.add(prefId); |
| return; |
| } |
| |
| if (listeners != null) { |
| listeners.firePropertyChange(prefId); |
| } |
| } |
| |
| public final void addListener(String[] eventsOfInterest, IPropertyMapListener listener) { |
| if (listeners == null) { |
| listeners = new PropertyListenerList(); |
| attachListener(); |
| } |
| listeners.add(eventsOfInterest, listener); |
| } |
| |
| protected final void firePropertyChange(String[] prefIds) { |
| if (ignoreCount > 0) { |
| for (int i = 0; i < prefIds.length; i++) { |
| queuedEvents.add(prefIds[i]); |
| } |
| return; |
| } |
| |
| if (listeners != null) { |
| listeners.firePropertyChange(prefIds); |
| } |
| } |
| |
| public final void startTransaction() { |
| ignoreCount++; |
| } |
| |
| public final void endTransaction() { |
| ignoreCount--; |
| if (ignoreCount == 0 && !queuedEvents.isEmpty()) { |
| if (listeners != null) { |
| listeners.firePropertyChange((String[]) queuedEvents.toArray(new String[queuedEvents.size()])); |
| } |
| queuedEvents.clear(); |
| } |
| } |
| |
| public boolean equals(Object toCompare) { |
| return toCompare instanceof IPropertyMap && PropertyUtil.isEqual(this, (IPropertyMap)toCompare); |
| } |
| |
| protected abstract void attachListener(); |
| protected abstract void detachListener(); |
| } |