// Copyright 2007, 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.services;

 import org.apache.tapestry5.services.*;

 import java.io.IOException;

 /**

  * A filter that intercepts Ajax-oriented requests, thos that originate on the client-side using XmlHttpRequest. In

  * these cases, the action processing occurs normally, but the response is quite different.

  */

 public class AjaxFilter implements ComponentEventRequestFilter

 {

     private final Request request;

     private final ComponentEventRequestHandler ajaxHandler;

     public AjaxFilter(Request request, @Ajax ComponentEventRequestHandler ajaxHandler)

     {

         this.request = request;

         this.ajaxHandler = ajaxHandler;

     }

     public void handle(ComponentEventRequestParameters parameters, ComponentEventRequestHandler handler)

             throws IOException

     {

         ComponentEventRequestHandler next = request.isXHR() ? ajaxHandler : handler;

         next.handle(parameters);

     }

 }