org.springframework.faces.webflow.FlowELResolver 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;
import javax.el.CompositeELResolver;
import javax.el.ELContext;
import javax.el.ELResolver;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.access.el.SpringBeanELResolver;
import org.springframework.beans.factory.support.StaticListableBeanFactory;
import org.springframework.binding.expression.el.MapAdaptableELResolver;
import org.springframework.webflow.execution.RequestContext;
import org.springframework.webflow.execution.RequestContextHolder;
import org.springframework.webflow.expression.el.FlowResourceELResolver;
import org.springframework.webflow.expression.el.ImplicitFlowVariableELResolver;
import org.springframework.webflow.expression.el.RequestContextELResolver;
import org.springframework.webflow.expression.el.ScopeSearchingELResolver;
/**
* Custom {@link ELResolver} for resolving web flow specific expressions.
*
* @author Jeremy Grelle
* @author Phillip Webb
*
* @since 2.4
*/
public class FlowELResolver extends CompositeELResolver {
public FlowELResolver() {
add(new RequestContextELResolver());
add(new ImplicitFlowVariableELResolver());
add(new FlowResourceELResolver());
add(new ScopeSearchingELResolver());
add(new MapAdaptableELResolver());
add(new BeanELResolver());
}
private static class BeanELResolver extends SpringBeanELResolver {
private static final BeanFactory EMPTY_BEAN_FACTORY = new StaticListableBeanFactory();
protected BeanFactory getBeanFactory(ELContext elContext) {
RequestContext requestContext = RequestContextHolder.getRequestContext();
if (requestContext == null) {
return EMPTY_BEAN_FACTORY;
}
BeanFactory beanFactory = requestContext.getActiveFlow().getApplicationContext();
return beanFactory != null ? beanFactory : EMPTY_BEAN_FACTORY;
}
}
}