    001    // Copyright 2007, 2008 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.internal.services;
    016
    017    import org.apache.tapestry5.services.*;
    018
    019    import java.io.IOException;
    020
    021    /**
    022     * A filter that intercepts Ajax-oriented requests, thos that originate on the client-side using XmlHttpRequest. In
    023     * these cases, the action processing occurs normally, but the response is quite different.
    024     */
    025    public class AjaxFilter implements ComponentEventRequestFilter
    026    {
    027        private final Request request;
    028
    029        private final ComponentEventRequestHandler ajaxHandler;
    030
    031        public AjaxFilter(Request request, @Ajax ComponentEventRequestHandler ajaxHandler)
    032        {
    033            this.request = request;
    034            this.ajaxHandler = ajaxHandler;
    035        }
    036
    037        public void handle(ComponentEventRequestParameters parameters, ComponentEventRequestHandler handler)
    038                throws IOException
    039        {
    040            ComponentEventRequestHandler next = request.isXHR() ? ajaxHandler : handler;
    041
    042            next.handle(parameters);
    043        }
    044
    045    }