/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.webbeans.el;
import java.beans.FeatureDescriptor;
import java.util.Iterator;
import java.util.Set;
import javax.el.ELContext;
import javax.el.ELException;
import javax.el.ELResolver;
import javax.enterprise.context.Dependent;
import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.inject.spi.Bean;
import org.apache.webbeans.config.WebBeansContext;
import org.apache.webbeans.container.BeanManagerImpl;
/**
* JSF or JSP expression language a.k.a EL resolver.
*
* <p>
* EL is registered with the JSF in faces-config.xml if there exist a faces-config.xml
* in the application location <code>WEB-INF/</code>. Otherwise it is registered with
* JspApplicationContext at start-up.
* </p>
*
* <p>
* All <code>@Dependent</code> scoped contextual instances created during an EL
* expression evaluation are destroyed when the evaluation completes.
* </p>
*
* @version $Rev: 1307826 $ $Date: 2012-03-31 17:24:37 +0200 (Sa, 31 Mär 2012) $
*
*/
public class WebBeansELResolver extends ELResolver
{
private WebBeansContext webBeansContext;
public WebBeansELResolver()
{
webBeansContext = WebBeansContext.getInstance();
}
/**
* {@inheritDoc}
*/
@Override
public Class<?> getCommonPropertyType(ELContext arg0, Object arg1)
{
return null;
}
/**
* {@inheritDoc}
*/
@Override
public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext arg0, Object arg1)
{
return null;
}
/**
* {@inheritDoc}
*/
@Override
public Class<?> getType(ELContext arg0, Object arg1, Object arg2) throws ELException
{
return null;
}
/**
* {@inheritDoc}
*/
@Override
@SuppressWarnings({"unchecked","deprecation"})
public Object getValue(ELContext context, Object obj, Object property) throws ELException
{
// Check if the OWB actually got used in this application
if (!webBeansContext.getBeanManagerImpl().isInUse())
{
return null;
}
//Bean instance
Object contextualInstance = null;
ELContextStore elContextStore = null;
if (obj == null)
{
//Name of the bean
String name = (String) property;
//Local store, create if not exist
elContextStore = ELContextStore.getInstance(true);
contextualInstance = elContextStore.findBeanByName(name);
if(contextualInstance != null)
{
context.setPropertyResolved(true);
return contextualInstance;
}
//Manager instance
BeanManagerImpl manager = elContextStore.getBeanManager();
//Get beans
Set<Bean<?>> beans = manager.getBeans(name);
//Found?
if(beans != null && !beans.isEmpty())
{
//Managed bean
Bean<Object> bean = (Bean<Object>)beans.iterator().next();
if(bean.getScope().equals(Dependent.class))
{
contextualInstance = getDependentContextualInstance(manager, elContextStore, context, bean);
}
else
{
// now we check for NormalScoped beans
contextualInstance = getNormalScopedContextualInstance(manager, elContextStore, context, bean, name);
}
}
}
return contextualInstance;
}
protected Object getNormalScopedContextualInstance(BeanManagerImpl manager, ELContextStore store, ELContext context, Bean<Object> bean, String beanName)
{
CreationalContext<Object> creationalContext = manager.createCreationalContext(bean);
Object contextualInstance = manager.getReference(bean, Object.class, creationalContext);
if (contextualInstance != null)
{
context.setPropertyResolved(true);
//Adding into store
store.addNormalScoped(beanName, contextualInstance);
}
return contextualInstance;
}
protected Object getDependentContextualInstance(BeanManagerImpl manager, ELContextStore store, ELContext context, Bean<Object> bean)
{
Object contextualInstance = store.getDependent(bean);
if(contextualInstance != null)
{
//Object found on the store
context.setPropertyResolved(true);
}
else
{
// If no contextualInstance found on the store
CreationalContext<Object> creationalContext = manager.createCreationalContext(bean);
contextualInstance = manager.getReference(bean, Object.class, creationalContext);
if (contextualInstance != null)
{
context.setPropertyResolved(true);
//Adding into store
store.addDependent(bean, contextualInstance, creationalContext);
}
}
return contextualInstance;
}
/**
* {@inheritDoc}
*/
@Override
public boolean isReadOnly(ELContext arg0, Object arg1, Object arg2) throws ELException
{
return false;
}
/**
* {@inheritDoc}
*/
@Override
public void setValue(ELContext arg0, Object arg1, Object arg2, Object arg3) throws ELException
{
}
}