001 // Copyright 2010 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.ajax; 016 017 import java.io.IOException; 018 019 import org.apache.tapestry5.internal.services.RequestConstants; 020 import org.apache.tapestry5.ioc.internal.util.InternalUtils; 021 import org.apache.tapestry5.services.Ajax; 022 import org.apache.tapestry5.services.ComponentEventRequestFilter; 023 import org.apache.tapestry5.services.ComponentEventRequestHandler; 024 import org.apache.tapestry5.services.ComponentEventRequestParameters; 025 import org.apache.tapestry5.services.Request; 026 027 /** 028 * Filter for the {@link Ajax} {@link ComponentEventRequestHandler} that informs the {@link AjaxFormUpdateController} 029 * about the form's client id and component id. Partial renders work with the 030 * AjaxFormUpdateController to ensure that the Form data, if any, is collected and rendered 031 * as part of the response. 032 * 033 * @since 5.2.0 034 */ 035 public class AjaxFormUpdateFilter implements ComponentEventRequestFilter 036 { 037 private final Request request; 038 039 private final AjaxFormUpdateController ajaxFormUpdateController; 040 041 public AjaxFormUpdateFilter(Request request, AjaxFormUpdateController ajaxFormUpdateController) 042 { 043 this.request = request; 044 this.ajaxFormUpdateController = ajaxFormUpdateController; 045 } 046 047 public void handle(ComponentEventRequestParameters parameters, ComponentEventRequestHandler handler) 048 throws IOException 049 { 050 String formClientId = request.getParameter(RequestConstants.FORM_CLIENTID_PARAMETER); 051 String formComponentId = request.getParameter(RequestConstants.FORM_COMPONENTID_PARAMETER); 052 053 if (InternalUtils.isNonBlank(formClientId) && InternalUtils.isNonBlank(formComponentId)) 054 ajaxFormUpdateController.initializeForForm(formComponentId, formClientId); 055 056 handler.handle(parameters); 057 } 058 }