abstractactivity.java

老外的在线考试

/*
 * SchoolEJB - CyberDemia's library of EJBs for educational related services.
 * Copyright (C) 2003 CyberDemia Research and Services
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 * 
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA  02111-1307, USA.
 *
 * See the COPYING file located in the top-level-directory of
 * the archive of this library for complete text of license.
 */
package com.cyberdemia.school;
import java.rmi.RemoteException;
import javax.ejb.EJBException;

import com.cyberdemia.ejb.SimpleEntityBean;

/**
 * AbstractActivity models an activity.
 * It is intended to be subclassed by actual EJB classes that represent activities.
 *
 * @ejb.bean name="AbstractActivity"
 *           generate="false"
 *           type="CMP"
 *           view-type="local"
 *
 * @version $Revision: 1.2 $ at $Date: 2004/06/20 10:17:44 $ by $Author: alexycyap $
 * @author Alexander Yap
 */
public abstract class AbstractActivity extends SimpleEntityBean
{

	/**
	* Gets the owner hierarchy node that this Activity belongs to.
	*
	* @ejb.interface-method
	*
	* @return Owner hierarchy node of this Activity.
	*/
	public IHierarchy getOwner()
	{
		if (m_owner==null)
		{
			m_owner = SchoolUtils.getNodeFromHierarchyId(getOwnerHierarchyId());
		}
		return m_owner;
	}

	/**
	* Sets the owner hierarchy node that this Activity belongs to.
	*
	* @ejb.interface-method
	*
	* @param owner Owner hierarchy node of this Activity.
	*/
	public void setOwner(IHierarchy owner)
	{
		setOwnerHierarchyId( owner.getHierarchyId() );
		m_owner = owner;
	}
	
	/**
	* Gets a String that encodes the hierarchy node that this Activity belongs to.
	* Each hierarchy node has its own unique "hierarchy identifier" String.
	*
	* @ejb.interface-method
	* @ejb.persistence
	*
	* @return The hierarchy identifier of the owner hierarchy node of this Activity.
	*/
	public abstract String getOwnerHierarchyId();
	
	/**
	* Sets a String that encodes the hierarchy node that this Activity belongs to.
	* Each hierarchy node has its own unique "hierarchy identifier" String.
	*
	* @ejb.interface-method
	*
	* @param hierId The hierarchy identifier of the owner hierarchy node of this Activity.
	*/
	public abstract void setOwnerHierarchyId( String hierId);
	
	/**
	* Sets last modified timestamp in milliseconds.
	*
	* @ejb.interface-method
	*
	* @param lastModified Last modified timestamp.
	*/
	public abstract void setLastModifiedMillis(long lastModified);

	/**
	* Gets last modified timestamp in milliseconds.
	*
	* @ejb.interface-method
	* @ejb.persistence
	*
	* @return Last modified timestamp.
	*/
	public abstract long getLastModifiedMillis();

	
	/**
	 * Checks if this Activity is active. An active Activity
	 * may be editted and used.
	 * An inactive Activity may be considered to be logically removed
	 * from the system, but is kept in the database to maintain
	 * consistency in reporting and historical logging.
	 *
	 * @ejb.persistence
	 *
	 * @return true if this Activity is active, false if inactive.
	 */
	public abstract boolean getActive();
	
	/**
	 * Sets whether this Activity is active. An active Activity
	 * may be editted and used.
	 * An inactive Activity may be considered to be logically removed
	 * from the system, but is kept in the database to maintain 
	 * consistency in reporting and historical logging.
	 *
	 * @ejb.interface-method
	 *
	 * @param active true to make this Activity active, false to make it inactive.
	 */
	public abstract void setActive(boolean active);
	
	/**
	 * Checks if this Activity is active. An active Activity
	 * may be editted and used.
	 * An inactive Activity may be considered to be logically removed
	 * from the system, but is kept in the database to maintain
	 * consistency in reporting and historical logging.
	 *
	 * @ejb.interface-method
	 *
	 * @return true if this Activity is active, false if inactive.
	 */
	public boolean isActive()
	{
		return getActive();
	}

	public void ejbActivate() throws EJBException, RemoteException
	{ 
		super.ejbActivate();
		m_owner = null;
	}

	public void ejbLoad() throws EJBException, RemoteException 
	{ 
		super.ejbLoad();
		m_owner = null;
	}

	protected IHierarchy m_owner=null;
}