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/*
 * Copyright (C) 2004-2008 Jive Software. 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.jivesoftware.openfire.event;

import java.util.List;
import java.util.Map;
import java.util.concurrent.CopyOnWriteArrayList;

import org.jivesoftware.openfire.group.Group;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Dispatches group events. Each event has a {@link EventType type}
 * and optional parameters, as follows:
 *
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * Event Type Extra Params
{@link EventType#group_created group_created} None
{@link EventType#group_deleting group_deleting} None
{@link EventType#member_added member_added} A param named member with a String username as a
 *      payload
{@link EventType#member_removed member_removed} A param named member with a String username as a
 *      payload
{@link EventType#admin_added admin_added} A param named admin with a String username
 *      as a payload
{@link EventType#admin_removed admin_removed} A param named admin with a String username
 *      as a payload
{@link EventType#group_modified group_modified} 
 * 
 *     
 * 
 *      
 *      
 *      
 *      
 *      
 *      
 *      
 *      
 *      
 *      
 *      
 * 
 *      
 *      
 *      
 *      
 *      
 * 
 *      
 *      
 *      
 *      Reason Key Value
Name modified
  type nameModified
  originalValue (Name before it was modified)
 * 
Description modified
  type descriptionModified
  originalValue (Description before it was
 * modified)
Property modified
  type propertyModified
  propertyKey (Name of the property)
  originalValue (Property value before it was
 * modified)
Property added
  type propertyAdded
  propertyKey (Name of the new property)
Property deleted
  type propertyDeleted
  propertyKey (Name of the property deleted)
 *
 * @author Matt Tucker
 */
public class GroupEventDispatcher {

    private static final Logger Log = LoggerFactory.getLogger(GroupEventDispatcher.class);

    private static List listeners =
            new CopyOnWriteArrayList<>();

    private GroupEventDispatcher() {
        // Not instantiable.
    }

    /**
     * Registers a listener to receive events.
     *
     * @param listener the listener.
     */
    public static void addListener(GroupEventListener listener) {
        if (listener == null) {
            throw new NullPointerException();
        }
        listeners.add(listener);
    }

    /**
     * Unregisters a listener to receive events.
     *
     * @param listener the listener.
     */
    public static void removeListener(GroupEventListener listener) {
        listeners.remove(listener);
    }

    /**
     * Dispatches an event to all listeners.
     *
     * @param group the group.
     * @param eventType the event type.
     * @param params event parameters.
     */
    public static void dispatchEvent(Group group, EventType eventType, Map params) {
        for (GroupEventListener listener : listeners) {
            try {
                switch (eventType) {
                    case group_created: {
                        listener.groupCreated(group, params);
                        break;
                    }
                    case group_deleting: {
                        listener.groupDeleting(group, params);
                        break;
                    }
                    case member_added: {
                        listener.memberAdded(group, params);
                        break;
                    }
                    case member_removed: {
                        listener.memberRemoved(group, params);
                        break;
                    }
                    case admin_added: {
                        listener.adminAdded(group, params);
                        break;
                    }
                    case admin_removed: {
                        listener.adminRemoved(group, params);
                        break;
                    }
                    case group_modified: {
                        listener.groupModified(group, params);
                        break;
                    }
                    default:
                        break;
                }
            }
            catch (Exception e) {
                Log.error(e.getMessage(), e);
            }
        }
    }

    /**
     * Represents valid event types.
     */
    public enum EventType {

        /**
         * A new group was created.
         */
        group_created,

        /**
         * A group is about to be deleted. Note that this event is fired before
         * a group is actually deleted. This allows for referential cleanup
         * before the group is gone.
         */
        group_deleting,

        /**
         * The name, description, or extended property of a group was changed.
         */
        group_modified,

        /**
         * A member was added to a group.
         */
        member_added,

        /**
         * A member was removed from a group.
         */
        member_removed,

        /**
         * An administrator was added to a group.
         */
        admin_added,

        /**
         * An administrator was removed from a group.
         */
        admin_removed;
    }
}