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/*
 *  Copyright 2004-2006 Stefan Reuter
 *
 *  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.asteriskjava.manager.internal;

import org.asteriskjava.manager.event.ManagerEvent;

import java.util.Map;

/**
 * Transforms maps of attributes to instances of ManagerEvent.
 *
 * @author srt
 * @version $Id$
 * @see org.asteriskjava.manager.event.ManagerEvent
 */
interface EventBuilder {
    /**
     * Registers a new event class. The event this class is registered for is
     * simply derived from the name of the class by stripping any package name
     * (if present) and stripping the sufffix "Event". For example
     * org.asteriskjava.manager.event.JoinEvent is registered for
     * the event "Join".
     * 
     * The event class must be a concrete class with a default constructor (one
     * that takes no arguments).
     *
     * @param clazz the event class to register, must extend
     *              {@link ManagerEvent}.
     * @throws IllegalArgumentException if clazz is not a valid event class
     */
    void registerEventClass(Class clazz) throws IllegalArgumentException;

    /**
     * Builds the event based on the given map of attributes and the registered
     * event classes.
     *
     * @param source     source attribute for the event
     * @param attributes map containing event attributes
     * @return a concrete instance of ManagerEvent or null if no
     * event class was registered for the event type.
     */
    ManagerEvent buildEvent(Object source, Map attributes);

    void deregisterEventClass(Class eventClass);
}