org.springframework.faces.webflow.FlowRenderKit Maven / Gradle / Ivy
/*
* Copyright 2004-2012 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.faces.webflow;
/**
* A render kit implementation that ensures use of Web Flow's FlowViewResponseStateManager, which takes over reading and
* writing JSF state and manages that in Web Flow's view scope.
*
* @author Rossen Stoyanchev
* @author Phillip Webb
* @since 2.2.0
*/
import java.lang.reflect.Constructor;
import javax.faces.render.RenderKit;
import javax.faces.render.RenderKitWrapper;
import javax.faces.render.ResponseStateManager;
import org.springframework.beans.BeanUtils;
import org.springframework.util.ClassUtils;
public class FlowRenderKit extends RenderKitWrapper {
private final RenderKit wrapped;
private final ResponseStateManager flowViewResponseStateManager;
public FlowRenderKit(RenderKit wrapped) {
this.wrapped = wrapped;
this.flowViewResponseStateManager = initResponseStateManager(wrapped.getResponseStateManager());
}
private ResponseStateManager initResponseStateManager(ResponseStateManager wrapped) {
if (!JsfRuntimeInformation.isMyFacesPresent()) {
return new FlowResponseStateManager(wrapped);
}
Constructor constructor;
try {
String className = "org.springframework.faces.webflow.MyFacesFlowResponseStateManager";
Class clazz = ClassUtils.forName(className, FlowRenderKit.class.getClassLoader());
constructor = ClassUtils.getConstructorIfAvailable(clazz, FlowResponseStateManager.class);
} catch (ClassNotFoundException e) {
throw new IllegalStateException("Could not initialize MyFacesFlowResponseStateManager", e);
} catch (LinkageError e) {
throw new IllegalStateException("Could not initialize MyFacesFlowResponseStateManager", e);
}
return (ResponseStateManager) BeanUtils.instantiateClass(constructor, new FlowResponseStateManager(wrapped));
}
public RenderKit getWrapped() {
return this.wrapped;
}
/**
* Returns an instance of {@link FlowResponseStateManager} in a JSF 2 environment or returns the delegates's
* ResponseStateManager instance otherwise.
*/
public ResponseStateManager getResponseStateManager() {
if (JsfUtils.isFlowRequest()) {
return this.flowViewResponseStateManager;
}
return this.wrapped.getResponseStateManager();
}
}