// Copyright 2006, 2008 The Apache Software Foundation

 //

 // 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.apache.tapestry5.internal.util;

 import org.apache.tapestry5.ComponentEventCallback;

 /**

  * A {@link org.apache.tapestry5.ComponentEventCallback} used for notification events. Event handler methods may return

  * true (to abort the event) or false (to allow the event to continue bubbling up), but all other values are forbidden.

  */

 public class NotificationEventCallback implements ComponentEventCallback

 {

     private final String eventType;

     private final String completeId;

     public NotificationEventCallback(String eventType, String completeId)

     {

         this.eventType = eventType;

         this.completeId = completeId;

     }

     public boolean handleResult(Object result)

     {

         if (result instanceof Boolean) return ((Boolean) result);

         throw new IllegalArgumentException(

                 UtilMessages.noReturnValueAccepted(eventType, completeId, result));

     }

 }