/*
* Copyright 2004-2008 the original author or authors.
*
* 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.springframework.webflow.mvc.view;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.js.ajax.SpringJavascriptAjaxHandler;
import org.springframework.js.ajax.tiles2.AjaxTilesView;
import org.springframework.webflow.execution.RequestContext;
import org.springframework.webflow.execution.RequestContextHolder;
import org.springframework.webflow.execution.View;
/**
* Tiles view implementation that is able to handle partial rendering for Spring Javascript Ajax requests.
*
* <p>
* This implementation uses the {@link SpringJavascriptAjaxHandler} by default to determine whether the current request
* is an Ajax request. On an Ajax request for an active flow execution, the fragments set by a {@code <render>} action
* will be respected, otherwise the parent {@link AjaxTilesView}'s resolution algorithm will be applied.
* </p>
*
* @author Jeremy Grelle
*/
public class FlowAjaxTilesView extends AjaxTilesView {
protected String[] getRenderFragments(Map model, HttpServletRequest request, HttpServletResponse response) {
RequestContext context = RequestContextHolder.getRequestContext();
if (context == null) {
return super.getRenderFragments(model, request, response);
} else {
String[] fragments = (String[]) context.getFlashScope().get(View.RENDER_FRAGMENTS_ATTRIBUTE);
if (fragments == null) {
return super.getRenderFragments(model, request, response);
}
return fragments;
}
}
}
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