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 }