001    // Copyright 2010, 2011 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    // http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.tapestry5.services;
016    
017    import org.apache.tapestry5.runtime.Component;
018    import org.apache.tapestry5.runtime.ComponentEvent;
019    
020    /**
021     * Interface used with  {@link org.apache.tapestry5.services.transform.TransformationSupport#addEventHandler(String, int, String, ComponentEventHandler)}} (and, in the old
022     * API, {@link ClassTransformation#addComponentEventHandler(String, int, String, ComponentEventHandler)}).
023     *
024     * @since 5.2.0
025     */
026    public interface ComponentEventHandler
027    {
028        /**
029         * Handles the event.
030         */
031        void handleEvent(Component instance, ComponentEvent event);
032    }