/*
 * Copyright (C) 2005 Erik Swenson - erik@oreports.com
 * 
 * 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 reserved a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place - Suite 330, Boston, MA 02111-1307, USA.
 *  
 */

package org.efs.openreports.util;

import java.io.Serializable;
import java.sql.*;

import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.EncoderException;
import org.apache.commons.codec.net.BCodec;
import org.apache.log4j.Logger;

import org.hibernate.Hibernate;
import org.hibernate.HibernateException;
import org.hibernate.usertype.*;

public class EncryptedStringUserType implements UserType
{
	protected static Logger log = Logger.getLogger(EncryptedStringUserType.class);
	
	private static final int[] TYPES = new int[]{Types.VARCHAR};
	
	private BCodec bCodec = new BCodec();

	public int[] sqlTypes()
	{
		return TYPES;
	}

	public Class returnedClass()
	{
		return String.class;
	}

	public boolean equals(Object x, Object y) throws HibernateException
	{
		if (x == y)
		{
			return true;
		}

		if (x == null)
		{
			return false;
		}

		return x.equals(y);
	}

	public Object nullSafeGet(ResultSet rs, String[] names, Object owner)
			throws HibernateException, SQLException
	{
		String encryptedValue = (String) Hibernate.STRING.nullSafeGet(rs, names[0]);

		if (encryptedValue != null)
		{	
			return decrypt(encryptedValue);		
		}
		else
		{
			return null;
		}
	}

	public void nullSafeSet(PreparedStatement pStmt, Object value, int index)
			throws HibernateException, SQLException
	{
		if (value != null)
		{			
			String encryptedValue = encrypt((String) value);
			Hibernate.STRING.nullSafeSet(pStmt, encryptedValue, index);
		}
		else
		{
			Hibernate.STRING.nullSafeSet(pStmt, String.valueOf(value), index);
		}
	}

	public Object deepCopy(Object value) throws HibernateException
	{
		if (value == null)
		{
			return null;
		}
		else
		{
			return new String((String) value);
		}
	}

	public boolean isMutable()
	{
		return false;
	}
	
	protected String encrypt(String value) 
	{			
		try
		{
			return bCodec.encode(value);
		}
		catch(EncoderException ee)
		{
			log.warn("ENCRYPT - " + value + " : " + ee.getMessage());
			return value;
		}
	}
	
	protected String decrypt(String value) 
	{		
		try
		{
			return bCodec.decode(value);
		}
		catch(DecoderException de)
		{
			log.warn("DECRYPT - " + value + " : " + de.getMessage());
			return value;
		}	
	}	
	
    public int hashCode(Object arg0) throws HibernateException 
    {
        return arg0.hashCode();
    }
    
   
    public Object replace(Object arg0, Object arg1, Object arg2)
			throws HibernateException
	{
		return deepCopy(arg0);
	}

	public Object assemble(Serializable arg0, Object arg1) throws HibernateException
	{
		return deepCopy(arg0);
	}

	public Serializable disassemble(Object value)
	{
		return (Serializable) deepCopy(value);
	}
			
}