daofactory.java

一个数据挖掘软件ALPHAMINERR的整个过程的JAVA版源代码

/*
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program 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 General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

package eti.bi.alphaminer.core.dao;


import java.util.Hashtable;

import eti.bi.exception.AppException;

/**
 * @since 		1.0
 * @version 	$Revision$ $Date$
 * @author		$Author$

 */
public class DAOFactory {
	
	private static Hashtable<String, String> aDAOPackageMap = new Hashtable<String, String>();

	static
	{
	//	aDAOPackageMap.put("KB", "hk.hku.eti.bi.bkb");
		aDAOPackageMap.put("BIML", "eti.bi.alphaminer.core.dao");		
	//	aDAOPackageMap.put("User", "hk.hku.eti.bi.securitymanager");		
	//	aDAOPackageMap.put("BIACL", "hk.hku.eti.bi.securitymanager");				
	}	

	/**
	 * 
	 * Gets the DAO instance for the specified DAO type and the repository type.
	 * 
	 * @param aDAOType The type of DAO. e.g. BIML, KB
	 * @param aRepositoryType The type or DB type of the repository. e.g. File, Mysql
	 * @return DAO The instance of the corresponding DAO
	 */
	public static DAO getDAO(String aDAOType, String aRepositoryType) throws AppException
	{
		String aDAOClassName = aDAOPackageMap.get(aDAOType) + "." + aDAOType + "DAO" + aRepositoryType;
		try
		{
			return (DAO)Class.forName(aDAOClassName).newInstance();
		}
		catch(Exception e)
		{
			e.printStackTrace();
			throw new AppException("Error instantiate DAO with class: " + aDAOClassName, e);
		}
	}
}