/*
* 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 javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import org.strecks.context.ActionContext;
import org.strecks.util.Assert;
/**
* Injection handler which searches for named attribute in the following scopes (listed in order)
* <i>request</i>, <i>session</i> then <i>application</i>. Use this instead of
* <code>RequestAttributeInjectionHandler</code>, <code>SessionAttributeInjectionHandler</code>
* or <code>ContextAttributeInjectionHandler</code> if your application does not know what scope
* to find the attribute in
* @author Phil Zoio
*/
public class ScopedAttributeInjectionHandler implements InjectionHandler
{
private String attributeName;
public ScopedAttributeInjectionHandler(String attributeName)
{
super();
Assert.notNull(attributeName);
this.attributeName = attributeName;
}
public String getAttributeName()
{
return attributeName;
}
public Object getValue(ActionContext injectionContext)
{
HttpServletRequest request = injectionContext.getRequest();
Object attribute = request.getAttribute(attributeName);
if (attribute == null)
{
HttpSession session = request.getSession();
attribute = session.getAttribute(attributeName);
}
if (attribute == null)
{
ServletContext context = injectionContext.getContext();
attribute = context.getAttribute(attributeName);
}
return attribute;
}
}