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/*
* Copyright (c) OSGi Alliance (2000, 2013). All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.osgi.framework;
import java.util.EventObject;
/**
* An event from the Framework describing a bundle lifecycle change.
* <p>
* {@code BundleEvent} objects are delivered to
* {@code SynchronousBundleListener}s and {@code BundleListener}s when a change
* occurs in a bundle's lifecycle. A type code is used to identify the event
* type for future extendability.
*
* <p>
* OSGi Alliance reserves the right to extend the set of types.
*
* @Immutable
* @see BundleListener
* @see SynchronousBundleListener
* @author $Id$
*/
public class BundleEvent extends EventObject {
static final long serialVersionUID = 4080640865971756012L;
/**
* Bundle that had a change occur in its lifecycle.
*/
private final Bundle bundle;
/**
* Type of bundle lifecycle change.
*/
private final int type;
/**
* The bundle has been installed.
*
* @see BundleContext#installBundle(String)
*/
public final static int INSTALLED = 0x00000001;
/**
* The bundle has been started.
* <p>
* The bundle's {@link BundleActivator#start(BundleContext) BundleActivator
* start} method has been executed if the bundle has a bundle activator
* class.
*
* @see Bundle#start()
*/
public final static int STARTED = 0x00000002;
/**
* The bundle has been stopped.
* <p>
* The bundle's {@link BundleActivator#stop(BundleContext) BundleActivator
* stop} method has been executed if the bundle has a bundle activator
* class.
*
* @see Bundle#stop()
*/
public final static int STOPPED = 0x00000004;
/**
* The bundle has been updated.
*
* @see Bundle#update()
*/
public final static int UPDATED = 0x00000008;
/**
* The bundle has been uninstalled.
*
* @see Bundle#uninstall()
*/
public final static int UNINSTALLED = 0x00000010;
/**
* The bundle has been resolved.
*
* @see Bundle#RESOLVED
* @since 1.3
*/
public final static int RESOLVED = 0x00000020;
/**
* The bundle has been unresolved.
*
* @see Bundle#INSTALLED
* @since 1.3
*/
public final static int UNRESOLVED = 0x00000040;
/**
* The bundle is about to be activated.
* <p>
* The bundle's {@link BundleActivator#start(BundleContext) BundleActivator
* start} method is about to be called if the bundle has a bundle activator
* class. This event is only delivered to {@link SynchronousBundleListener}
* s. It is not delivered to {@code BundleListener}s.
*
* @see Bundle#start()
* @since 1.3
*/
public final static int STARTING = 0x00000080;
/**
* The bundle is about to deactivated.
* <p>
* The bundle's {@link BundleActivator#stop(BundleContext) BundleActivator
* stop} method is about to be called if the bundle has a bundle activator
* class. This event is only delivered to {@link SynchronousBundleListener}
* s. It is not delivered to {@code BundleListener}s.
*
* @see Bundle#stop()
* @since 1.3
*/
public final static int STOPPING = 0x00000100;
/**
* The bundle will be lazily activated.
* <p>
* The bundle has a {@link Constants#ACTIVATION_LAZY lazy activation policy}
* and is waiting to be activated. It is now in the {@link Bundle#STARTING
* STARTING} state and has a valid {@code BundleContext}. This event is only
* delivered to {@link SynchronousBundleListener}s. It is not delivered to
* {@code BundleListener}s.
*
* @since 1.4
*/
public final static int LAZY_ACTIVATION = 0x00000200;
/**
* Bundle that was the origin of the event. For install event type, this is
* the bundle whose context was used to install the bundle. Otherwise it is
* the bundle itself.
*
* @since 1.6
*/
private final Bundle origin;
/**
* Creates a bundle event of the specified type.
*
* @param type The event type.
* @param bundle The bundle which had a lifecycle change.
* @param origin The bundle which is the origin of the event. For the event
* type {@link #INSTALLED}, this is the bundle whose context was used
* to install the bundle. Otherwise it is the bundle itself.
* @since 1.6
*/
public BundleEvent(int type, Bundle bundle, Bundle origin) {
super(bundle);
if (origin == null) {
throw new IllegalArgumentException("null origin");
}
this.bundle = bundle;
this.type = type;
this.origin = origin;
}
/**
* Creates a bundle event of the specified type.
*
* @param type The event type.
* @param bundle The bundle which had a lifecycle change. This bundle is
* used as the origin of the event.
*/
public BundleEvent(int type, Bundle bundle) {
super(bundle);
this.bundle = bundle;
this.type = type;
this.origin = bundle;
}
/**
* Returns the bundle which had a lifecycle change. This bundle is the
* source of the event.
*
* @return The bundle that had a change occur in its lifecycle.
*/
public Bundle getBundle() {
return bundle;
}
/**
* Returns the type of lifecyle event. The type values are:
* <ul>
* <li>{@link #INSTALLED}</li>
* <li>{@link #RESOLVED}</li>
* <li>{@link #LAZY_ACTIVATION}</li>
* <li>{@link #STARTING}</li>
* <li>{@link #STARTED}</li>
* <li>{@link #STOPPING}</li>
* <li>{@link #STOPPED}</li>
* <li>{@link #UPDATED}</li>
* <li>{@link #UNRESOLVED}</li>
* <li>{@link #UNINSTALLED}</li>
* </ul>
*
* @return The type of lifecycle event.
*/
public int getType() {
return type;
}
/**
* Returns the bundle that was the origin of the event.
*
* <p>
* For the event type {@link #INSTALLED}, this is the bundle whose context
* was used to install the bundle. Otherwise it is the bundle itself.
*
* @return The bundle that was the origin of the event.
* @since 1.6
*/
public Bundle getOrigin() {
return origin;
}
}
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