/*
* 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.webflow.mvc.builder;
import java.util.Collections;
import java.util.List;
import org.springframework.web.servlet.View;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.webflow.execution.RequestContext;
import org.springframework.webflow.mvc.view.FlowViewResolver;
/**
* Delegates to a configured view resolver chain to resolve the Spring MVC view implementation to render.
*
* @see ViewResolver
*
* @author Keith Donald
*/
public class DelegatingFlowViewResolver implements FlowViewResolver {
private List<ViewResolver> viewResolvers;
/**
* Creates a new flow view resolver.
* @param viewResolvers the Spring MVC view resolver chain to delegate to
*/
public DelegatingFlowViewResolver(List<ViewResolver> viewResolvers) {
this.viewResolvers = viewResolvers != null ? viewResolvers : Collections.<ViewResolver> emptyList();
}
public View resolveView(String viewId, RequestContext context) {
for (ViewResolver viewResolver : viewResolvers) {
try {
View view = viewResolver.resolveViewName(viewId, context.getExternalContext().getLocale());
if (view != null) {
return view;
}
} catch (Exception e) {
IllegalStateException ise = new IllegalStateException("Exception resolving view with name '" + viewId
+ "'");
ise.initCause(e);
throw ise;
}
}
return null;
}
public String getViewIdByConvention(String viewStateId) {
return viewStateId;
}
}