bundles/org.eclipse.ui.workbench/Eclipse UI/org/eclipse/ui/internal/activities/AbstractActivityManager.java

/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

package org.eclipse.ui.internal.activities;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.ui.activities.ActivityManagerEvent;
import org.eclipse.ui.activities.IActivityManager;
import org.eclipse.ui.activities.IActivityManagerListener;

public abstract class AbstractActivityManager implements IActivityManager {
	private List activityManagerListeners;

	protected AbstractActivityManager() {
	}

	public void addActivityManagerListener(IActivityManagerListener activityManagerListener) {
		if (activityManagerListener == null)
			throw new NullPointerException();

		if (activityManagerListeners == null)
			activityManagerListeners = new ArrayList();

		if (!activityManagerListeners.contains(activityManagerListener))
			activityManagerListeners.add(activityManagerListener);
	}

	protected void fireActivityManagerChanged(ActivityManagerEvent activityManagerEvent) {
		if (activityManagerEvent == null)
			throw new NullPointerException();

		if (activityManagerListeners != null)
			for (int i = 0; i < activityManagerListeners.size(); i++)
				(
					(IActivityManagerListener) activityManagerListeners.get(
						i)).activityManagerChanged(
					activityManagerEvent);
	}

	public void removeActivityManagerListener(IActivityManagerListener activityManagerListener) {
		if (activityManagerListener == null)
			throw new NullPointerException();

		if (activityManagerListeners != null)
			activityManagerListeners.remove(activityManagerListener);
	}
}