LifecycleEvent.java

/*******************************************************************************
 * Copyright (c) 2000, 2009 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
 *     Serge Beauchamp (Freescale Semiconductor) - [229633] Group Support
 *******************************************************************************/
package org.eclipse.core.internal.events;

import org.eclipse.core.resources.IResource;

/**
 * Class used for broadcasting internal workspace lifecycle events. There is a singleton instance,
 * so no listener is allowed to keep references to the event after the notification is finished.
 */
public class LifecycleEvent {
	//constants for kinds of internal workspace lifecycle events
	public static final int PRE_PROJECT_CLOSE= 0x01;

	public static final int PRE_PROJECT_CHANGE= 0x02;

	public static final int PRE_PROJECT_COPY= 0x04;

	public static final int PRE_PROJECT_CREATE= 0x08;

	public static final int PRE_PROJECT_DELETE= 0x10;

	public static final int PRE_PROJECT_OPEN= 0x20;

	public static final int PRE_PROJECT_MOVE= 0x40;

	public static final int PRE_LINK_COPY= 0x100;

	public static final int PRE_LINK_CREATE= 0x200;

	public static final int PRE_LINK_DELETE= 0x400;

	public static final int PRE_LINK_MOVE= 0x800;

	public static final int PRE_REFRESH= 0x1000;

	public static final int PRE_GROUP_COPY= 0x2000;

	public static final int PRE_GROUP_CREATE= 0x4000;

	public static final int PRE_GROUP_DELETE= 0x8000;

	public static final int PRE_GROUP_MOVE= 0x10000;

	public static final int PRE_FILTER_ADD= 0x20000;

	public static final int PRE_FILTER_REMOVE= 0x40000;

	public static final int PRE_LINK_CHANGE= 0x80000;

	/**
	 * The kind of event
	 */
	public int kind;

	/**
	 * For events that only involve one resource, this is it. More specifically, this is used for
	 * all events that don't involve a more or copy. For copy/move events, this resource represents
	 * the source of the copy/move.
	 */
	public IResource resource;

	/**
	 * For copy/move events, this resource represents the destination of the copy/move.
	 */
	public IResource newResource;

	/**
	 * The update flags for the event.
	 */
	public int updateFlags;

	private static final LifecycleEvent instance= new LifecycleEvent();

	private LifecycleEvent() {
		super();
	}

	public static LifecycleEvent newEvent(int kind, IResource resource) {
		instance.kind= kind;
		instance.resource= resource;
		instance.newResource= null;
		instance.updateFlags= 0;
		return instance;
	}

	public static LifecycleEvent newEvent(int kind, IResource oldResource, IResource newResource, int updateFlags) {
		instance.kind= kind;
		instance.resource= oldResource;
		instance.newResource= newResource;
		instance.updateFlags= updateFlags;
		return instance;
	}
}