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}