/*
 * $Header: /cvshome/build/org.osgi.framework/src/org/osgi/framework/FrameworkEvent.java,v 1.9 2005/05/13 20:32:56 hargrave Exp $
 * 
 * Copyright (c) OSGi Alliance (2004, 2005). 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.
 */

package org.osgi.framework;

import java.util.EventObject;

/**
 * A general Framework event.
 * 
 * <p>
 * <code>FrameworkEvent</code> is the event class used when notifying listeners of
 * general events occuring within the OSGI environment. A type code is used to
 * identify the event type for future extendability.
 * 
 * <p>
 * OSGi Alliance reserves the right to extend the set of event types.
 * 
 * @version $Revision: 1.9 $
 */

public class FrameworkEvent extends EventObject {
	static final long		serialVersionUID	= 207051004521261705L;
	/**
	 * Bundle related to the event.
	 */
	private Bundle			bundle;

	/**
	 * Exception related to the event.
	 */
	private Throwable		throwable;

	/**
	 * Type of event.
	 */
	private int				type;

	/**
	 * The Framework has started.
	 * 
	 * <p>
	 * This event is broadcast when the Framework has started after all
	 * installed bundles that are marked to be started have been started and the
	 * Framework has reached the intitial start level.
	 * 
	 * <p>
	 * The value of <code>STARTED</code> is 0x00000001.
	 * 
	 * @see "<code>StartLevel</code>"
	 */
	public final static int	STARTED				= 0x00000001;

	/**
	 * An error has occurred.
	 * 
	 * <p>
	 * There was an error associated with a bundle.
	 * 
	 * <p>
	 * The value of <code>ERROR</code> is 0x00000002.
	 */
	public final static int	ERROR				= 0x00000002;

	/**
	 * A PackageAdmin.refreshPackage operation has completed.
	 * 
	 * <p>
	 * This event is broadcast when the Framework has completed the refresh
	 * packages operation initiated by a call to the
	 * PackageAdmin.refreshPackages method.
	 * 
	 * <p>
	 * The value of <code>PACKAGES_REFRESHED</code> is 0x00000004.
	 * 
	 * @since 1.2
	 * @see "<code>PackageAdmin.refreshPackages</code>"
	 */
	public final static int	PACKAGES_REFRESHED	= 0x00000004;

	/**
	 * A StartLevel.setStartLevel operation has completed.
	 * 
	 * <p>
	 * This event is broadcast when the Framework has completed changing the
	 * active start level initiated by a call to the StartLevel.setStartLevel
	 * method.
	 * 
	 * <p>
	 * The value of <code>STARTLEVEL_CHANGED</code> is 0x00000008.
	 * 
	 * @since 1.2
	 * @see "<code>StartLevel</code>"
	 */
	public final static int	STARTLEVEL_CHANGED	= 0x00000008;

	/**
	 * A warning has occurred.
	 * 
	 * <p>
	 * There was a warning associated with a bundle.
	 * 
	 * <p>
	 * The value of <code>WARNING</code> is 0x00000010.
	 * 
	 * @since 1.3
	 */
	public final static int	WARNING				= 0x00000010;

	/**
	 * An informational event has occurred.
	 * 
	 * <p>
	 * There was an informational event associated with a bundle.
	 * 
	 * <p>
	 * The value of <code>INFO</code> is 0x00000020.
	 * 
	 * @since 1.3
	 */
	public final static int	INFO				= 0x00000020;

	/**
	 * Creates a Framework event.
	 * 
	 * @param type The event type.
	 * @param source The event source object. This may not be <code>null</code>.
	 * @deprecated Since 1.2. This constructor is deprecated in favor of using
	 *             the other constructor with the System Bundle as the event
	 *             source.
	 */
	public FrameworkEvent(int type, Object source) {
		super(source);
		this.type = type;
		this.bundle = null;
		this.throwable = null;
	}

	/**
	 * Creates a Framework event regarding the specified bundle.
	 * 
	 * @param type The event type.
	 * @param bundle The event source.
	 * @param throwable The related exception. This argument may be
	 *        <code>null</code> if there is no related exception.
	 */
	public FrameworkEvent(int type, Bundle bundle, Throwable throwable) {
		super(bundle);
		this.type = type;
		this.bundle = bundle;
		this.throwable = throwable;
	}

	/**
	 * Returns the exception related to this event.
	 * 
	 * @return The related exception or <code>null</code> if none.
	 */
	public Throwable getThrowable() {
		return throwable;
	}

	/**
	 * Returns the bundle associated with the event. This bundle is also the
	 * source of the event.
	 * 
	 * @return The bundle associated with the event.
	 */
	public Bundle getBundle() {
		return bundle;
	}

	/**
	 * Returns the type of framework event.
	 * <p>
	 * The type values are:
	 * <ul>
	 * <li>{@link #STARTED}
	 * <li>{@link #ERROR}
	 * <li>{@link #WARNING}
	 * <li>{@link #INFO}
	 * <li>{@link #PACKAGES_REFRESHED}
	 * <li>{@link #STARTLEVEL_CHANGED}
	 * </ul>
	 * 
	 * @return The type of state change.
	 */

	public int getType() {
		return type;
	}
}
