// Copyright 2007, 2008 The Apache Software Foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package org.apache.tapestry.internal.services;
import org.apache.tapestry.ContentType;
import org.apache.tapestry.TapestryConstants;
import org.apache.tapestry.internal.InternalConstants;
import org.apache.tapestry.internal.structure.ComponentPageElement;
import org.apache.tapestry.internal.structure.Page;
import org.apache.tapestry.json.JSONObject;
import org.apache.tapestry.services.*;
import java.io.IOException;
/**
* Similar to {@link ComponentEventRequestHandlerImpl}, but built around the Ajax request cycle, where the action
* request sends back an immediate JSON response containing the new content.
*/
public class AjaxComponentEventRequestHandler implements ComponentEventRequestHandler
{
private final RequestPageCache _cache;
private final Request _request;
private final PageRenderQueue _queue;
private final ComponentEventResultProcessor _resultProcessor;
private final PageContentTypeAnalyzer _pageContentTypeAnalyzer;
public AjaxComponentEventRequestHandler(RequestPageCache cache, Request request, PageRenderQueue queue,
@Ajax ComponentEventResultProcessor resultProcessor,
PageContentTypeAnalyzer pageContentTypeAnalyzer)
{
_cache = cache;
_queue = queue;
_resultProcessor = resultProcessor;
_pageContentTypeAnalyzer = pageContentTypeAnalyzer;
_request = request;
}
public void handle(ComponentEventRequestParameters parameters) throws IOException
{
Page activePage = _cache.get(parameters.getActivePageName());
ComponentResultProcessorWrapper callback = new ComponentResultProcessorWrapper(_resultProcessor);
activePage.getRootElement().triggerContextEvent(TapestryConstants.ACTIVATE_EVENT,
parameters.getPageActivationContext(), callback);
if (callback.isAborted()) return;
// If we end up doing a partial render, the page render queue service needs to know the
// page that will be rendered (for logging purposes, if nothing else).
_queue.initializeForCompletePage(activePage);
ContentType contentType = _pageContentTypeAnalyzer.findContentType(activePage);
_request.setAttribute(InternalConstants.CONTENT_TYPE_ATTRIBUTE_NAME, contentType);
Page containerPage = _cache.get(parameters.getContainingPageName());
ComponentPageElement element = containerPage.getComponentElementByNestedId(parameters.getNestedComponentId());
element.triggerContextEvent(parameters.getEventType(), parameters.getEventContext(), callback);
if (callback.isAborted()) return;
JSONObject reply = new JSONObject();
_resultProcessor.processResultValue(reply);
}
}