org.eclipse.osbp.utils/src/org/eclipse/osbp/utils/constants/Base26Crypt.java

/**
 *                                                                            
 *  Copyright (c) 2011, 2016 - Loetz GmbH&Co.KG (69115 Heidelberg, Germany) 
 *                                                                            
 *  All rights reserved. This program and the accompanying materials           
 *  are made available under the terms of the Eclipse Public License v1.0       
 *  which accompanies this distribution, and is available at                  
 *  http://www.eclipse.org/legal/epl-v10.html                                 
 *                                                                            
 *  Contributors:                                                      
 * 	   Christophe Loetz (Loetz GmbH&Co.KG) - initial implementation
 * 
 */
 package org.eclipse.osbp.utils.constants;

import java.math.BigInteger;

public class Base26Crypt {

	public static long convertToKey(String sName) {
		// Convert string into Base-26 number A-Z becomes 0-9A-P...
		StringBuffer sbuff = new StringBuffer(sName.replaceAll("(\\W)", "").toUpperCase());
		for (int i = 0; i < sbuff.length(); ++i) {
			char cVal = sbuff.charAt(i);
			if (cVal > 'J')
				cVal = (char) (cVal - 'K' + 'A'); // K-Z becomes A-P
			else
				cVal = (char) (cVal - 'A' + '0'); // A-J becomes 0-9
			sbuff.setCharAt(i, cVal);
		}

		// Convert base-26 string into BigInteger...
		BigInteger bigInt = new BigInteger(sbuff.toString(), 26);

		// Convert BigInteger into long license key...
		long lKey = bigInt.longValue();

		return (lKey);
	}
}