    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    }