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/*
 * Copyright (c) OSGi Alliance (2008, 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.service.blueprint.container;

/**
 * Event property names used in Event Admin events published by a Blueprint
 * Container.
 * 
 * 
 * Each type of event is sent to a different topic:
 * 
 * 

 * {@code org/osgi/service/blueprint/container/}<event-type>
 * 
 * 

 * where <event-type> can have the values
 * {@link BlueprintEvent#CREATING CREATING}, {@link BlueprintEvent#CREATED
 * CREATED}, {@link BlueprintEvent#DESTROYING DESTROYING},
 * {@link BlueprintEvent#DESTROYED DESTROYED}, {@link BlueprintEvent#FAILURE
 * FAILURE}, {@link BlueprintEvent#GRACE_PERIOD GRACE_PERIOD}, or
 * {@link BlueprintEvent#WAITING WAITING}.
 * 
 * 

 * Such events have the following properties:
 * 

 * {@link #TYPE type}
 * {@link #EVENT event}
 * {@link #TIMESTAMP timestamp}
 * {@link #BUNDLE bundle}
 * {@link #BUNDLE_SYMBOLICNAME bundle.symbolicName}
 * {@link #BUNDLE_ID bundle.id}
 * {@link #BUNDLE_VERSION bundle.version}
 * {@link #EXTENDER_BUNDLE_SYMBOLICNAME extender.bundle.symbolicName}
 * {@link #EXTENDER_BUNDLE_ID extender.bundle.id}
 * {@link #EXTENDER_BUNDLE_VERSION extender.bundle.version}
 * {@link #DEPENDENCIES dependencies}
 * {@link #CAUSE cause}
 * 
 * 
 * @Immutable
 * @author $Id: 03094c35e23dcbc0d33d9f18b264765a9c8ad143 $
 */
public class EventConstants {
	private EventConstants() {
		// non-instantiable class
	}

	/**
	 * The type of the event that has been issued. This property is of type
	 * {@code Integer} and can take one of the values defined in
	 * {@link BlueprintEvent}.
	 */
	public static final String	TYPE							= "type";

	/**
	 * The {@code BlueprintEvent} object that caused this event. This property
	 * is of type {@link BlueprintEvent}.
	 */
	public static final String	EVENT							= "event";

	/**
	 * The time the event was created. This property is of type {@code Long}.
	 */
	public static final String	TIMESTAMP						= "timestamp";

	/**
	 * The Blueprint bundle associated with this event. This property is of type
	 * {@code Bundle}.
	 */
	public static final String	BUNDLE							= "bundle";

	/**
	 * The bundle id of the Blueprint bundle associated with this event. This
	 * property is of type {@code Long}.
	 */
	public static final String	BUNDLE_ID						= "bundle.id";

	/**
	 * The bundle symbolic name of the Blueprint bundle associated with this
	 * event. This property is of type {@code String}.
	 */
	public static final String	BUNDLE_SYMBOLICNAME				= "bundle.symbolicName";

	/**
	 * The bundle version of the Blueprint bundle associated with this event.
	 * This property is of type {@code Version}.
	 */
	public static final String	BUNDLE_VERSION					= "bundle.version";

	/**
	 * The Blueprint extender bundle that is generating this event. This
	 * property is of type {@code Bundle}.
	 */
	public static final String	EXTENDER_BUNDLE					= "extender.bundle";

	/**
	 * The bundle id of the Blueprint extender bundle that is generating this
	 * event. This property is of type {@code Long}.
	 */
	public static final String	EXTENDER_BUNDLE_ID				= "extender.bundle.id";

	/**
	 * The bundle symbolic of the Blueprint extender bundle that is generating
	 * this event. This property is of type {@code String}.
	 */
	public static final String	EXTENDER_BUNDLE_SYMBOLICNAME	= "extender.bundle.symbolicName";

	/**
	 * The bundle version of the Blueprint extender bundle that is generating
	 * this event. This property is of type {@code Version}.
	 */
	public static final String	EXTENDER_BUNDLE_VERSION			= "extender.bundle.version";

	/**
	 * The filters identifying the missing dependencies that caused this event
	 * for a {@link BlueprintEvent#FAILURE FAILURE},
	 * {@link BlueprintEvent#GRACE_PERIOD GRACE_PERIOD}, or
	 * {@link BlueprintEvent#WAITING WAITING} event. This property type is an
	 * array of {@code String}.
	 */
	public static final String	DEPENDENCIES					= "dependencies";

	/**
	 * The cause for a {@link BlueprintEvent#FAILURE FAILURE} event. This
	 * property is of type {@code Throwable}.
	 */
	public static final String	CAUSE							= "cause";

	/**
	 * Topic prefix for all events issued by the Blueprint Container
	 */
	public static final String	TOPIC_BLUEPRINT_EVENTS			= "org/osgi/service/blueprint/container";

	/**
	 * Topic for Blueprint Container CREATING events
	 */
	public static final String	TOPIC_CREATING					= TOPIC_BLUEPRINT_EVENTS + "/CREATING";

	/**
	 * Topic for Blueprint Container CREATED events
	 */
	public static final String	TOPIC_CREATED					= TOPIC_BLUEPRINT_EVENTS + "/CREATED";

	/**
	 * Topic for Blueprint Container DESTROYING events
	 */
	public static final String	TOPIC_DESTROYING				= TOPIC_BLUEPRINT_EVENTS + "/DESTROYING";

	/**
	 * Topic for Blueprint Container DESTROYED events
	 */
	public static final String	TOPIC_DESTROYED					= TOPIC_BLUEPRINT_EVENTS + "/DESTROYED";

	/**
	 * Topic for Blueprint Container FAILURE events
	 */
	public static final String	TOPIC_FAILURE					= TOPIC_BLUEPRINT_EVENTS + "/FAILURE";

	/**
	 * Topic for Blueprint Container GRACE_PERIOD events
	 */
	public static final String	TOPIC_GRACE_PERIOD				= TOPIC_BLUEPRINT_EVENTS + "/GRACE_PERIOD";

	/**
	 * Topic for Blueprint Container WAITING events
	 */
	public static final String	TOPIC_WAITING					= TOPIC_BLUEPRINT_EVENTS + "/WAITING";
}