/*
* 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.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import org.strecks.context.ActionContext;
import org.strecks.exceptions.StaleSessionException;
import org.strecks.util.Assert;
import org.strecks.util.ReflectHelper;
/**
* Injection handler to find named attribute from <code>HttpSession</code>, i.e. <i>session</i>
* scope
* @author Phil Zoio
*/
public class SessionAttributeInjectionHandler implements InjectionHandler
{
private String attributeName;
private Class autoCreateClass;
private boolean required;
public SessionAttributeInjectionHandler(String attributeName, Class autoCreateClass, boolean required)
{
super();
Assert.notNull(attributeName);
this.attributeName = attributeName;
this.autoCreateClass = autoCreateClass;
this.required = required;
}
public String getAttributeName()
{
return attributeName;
}
public Object getValue(ActionContext injectionContext)
{
HttpServletRequest request = injectionContext.getRequest();
HttpSession session = request.getSession(false);
Object attribute = null;
if (session != null)
attribute = session.getAttribute(attributeName);
if (attribute == null)
{
if (required)
{
throw new StaleSessionException("Attribute missing from session: " + attributeName);
}
if (autoCreateClass != null)
{
attribute = ReflectHelper.createInstance(autoCreateClass, Object.class);
if (session == null)
{
session = request.getSession();
}
session.setAttribute(attributeName, attribute);
}
}
return attribute;
}
}