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/*******************************************************************************
* Copyright (c) 2004, 2015 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* 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();
@Override
public final void addListener(IPropertyMapListener listener) {
if (listeners == null) {
listeners = new PropertyListenerList();
attachListener();
}
listeners.add(listener);
}
@Override
public final void removeListener(IPropertyMapListener listener) {
if (listeners != null) {
listeners.remove(listener);
if (listeners.isEmpty()) {
detachListener();
listeners = null;
}
}
}
@Override
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);
}
}
@Override
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 (String prefId : prefIds) {
queuedEvents.add(prefId);
}
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();
}
}
@Override
public boolean equals(Object toCompare) {
return toCompare instanceof IPropertyMap && PropertyUtil.isEqual(this, (IPropertyMap)toCompare);
}
protected abstract void attachListener();
protected abstract void detachListener();
}
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