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/**
 *  Copyright (C) 2006  Robin Bygrave
 *  
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 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
 *  Lesser General Public License for more details.
 *  
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */
package com.avaje.ebeaninternal.server.lib.sql;

import java.sql.Connection;

/**
 * Helper object that can convert between transaction isolation descriptions and values.
 *
 */
public class TransactionIsolation {


    /**
     * return the isolation level for a given string description.
     */
	public static int getLevel(String level) {
	    level = level.toUpperCase();
	    if ("NONE".equalsIgnoreCase(level)){
	        return Connection.TRANSACTION_NONE;
	    }
	    if ("READ_COMMITTED".equalsIgnoreCase(level)){
	        return Connection.TRANSACTION_READ_COMMITTED;
	    }
	    if ("READCOMMITTED".equalsIgnoreCase(level)){
	        return Connection.TRANSACTION_READ_COMMITTED;
	    }
	    if ("READ_UNCOMMITTED".equalsIgnoreCase(level)){
	        return Connection.TRANSACTION_READ_UNCOMMITTED;
	    }
	    if ("READUNCOMMITTED".equalsIgnoreCase(level)){
	        return Connection.TRANSACTION_READ_UNCOMMITTED;
	    }
	    if ("REPEATABLE_READ".equalsIgnoreCase(level)){
	        return Connection.TRANSACTION_REPEATABLE_READ;
	    }
	    if ("REPEATABLEREAD".equalsIgnoreCase(level)){
	        return Connection.TRANSACTION_REPEATABLE_READ;
	    }
	    if ("SERIALIZABLE".equalsIgnoreCase(level)){
	        return Connection.TRANSACTION_SERIALIZABLE;
	    }
        if ("SERIALISABLE".equalsIgnoreCase(level)){
            return Connection.TRANSACTION_SERIALIZABLE;
        }
		throw new RuntimeException("Transaction Isolaction level [" + level + "] is not known.");
	}
    
	/**
	 * Return the string description of the transaction isolation level specified.
	 * Returned value is one of NONE, READ_COMMITTED,READ_UNCOMMITTED, 
	 * REPEATABLE_READ or SERIALIZABLE.
	 * 
	 * @param level the transaction isolation level as per java.sql.Connection
	 * @return the level description as a string.
	 */
	public static String getLevelDescription(int level) {
		switch (level) {
			case Connection.TRANSACTION_NONE :
				return "NONE";
			case Connection.TRANSACTION_READ_COMMITTED :
				return "READ_COMMITTED";
			case Connection.TRANSACTION_READ_UNCOMMITTED :
				return "READ_UNCOMMITTED";
			case Connection.TRANSACTION_REPEATABLE_READ :
				return "REPEATABLE_READ";
			case Connection.TRANSACTION_SERIALIZABLE :
				return "SERIALIZABLE";
            case -1 :
                return "NotSet";
			default :
				throw new RuntimeException("Transaction Isolaction level [" + level + "] is not defined.");
		}
	}



}