    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
    015package org.apache.tapestry5.internal.services;
    016
    017import org.apache.tapestry5.services.*;
    018
    019import 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 */
    025public 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}