/*
* Copyright 2005-2006 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.strecks.injection.handler;
import javax.servlet.ServletContext;
import org.strecks.context.ActionContext;
import org.strecks.injection.factory.AnnotationFactoryUtils;
import org.strecks.util.Assert;
/**
* Injection handler to find named attribute from <code>ServletContext</code>
* @author Phil Zoio
*/
public class ContextAttributeInjectionHandler implements InjectionHandler
{
private String attributeName;
private Class autoCreateClass;
public ContextAttributeInjectionHandler(String attributeName, Class autoCreateClass)
{
super();
Assert.notNull(attributeName);
this.attributeName = attributeName;
this.autoCreateClass = autoCreateClass;
}
public String getAttributeName()
{
return attributeName;
}
public Object getValue(ActionContext injectionContext)
{
ServletContext context = injectionContext.getContext();
Object attribute = context.getAttribute(attributeName);
if (attribute == null && autoCreateClass != null)
{
attribute = AnnotationFactoryUtils.maybeAutoCreate(autoCreateClass);
context.setAttribute(attributeName, attribute);
}
return attribute;
}
}