/* Copyright (C) 2002-2004 MySQL AB This program is free software; you can redistribute it and/or modify it under the terms of version 2 of the GNU General Public License as  published by the Free Software Foundation. There are special exceptions to the terms and conditions of the GPL  as it is applied to this software. View the full text of the  exception in file EXCEPTIONS-CONNECTOR-J in the directory of this  software distribution. 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */package com.mysql.jdbc;import java.rmi.server.UID;import java.sql.SQLException;import java.sql.Savepoint;/** * Represents SQL SAVEPOINTS in MySQL. *  * @author Mark Matthews *  * @version $Id: MysqlSavepoint.java 4489 2005-11-01 00:43:01Z mmatthews $ */public class MysqlSavepoint implements Savepoint {	private static String getUniqueId() {		// no need to re-invent the wheel here...		String uidStr = new UID().toString();		int uidLength = uidStr.length();		StringBuffer safeString = new StringBuffer(uidLength);		for (int i = 0; i < uidLength; i++) {			char c = uidStr.charAt(i);			if (Character.isLetter(c) || Character.isDigit(c)) {				safeString.append(c);			} else {				safeString.append('_');			}		}		return safeString.toString();	}	private String savepointName;	/**	 * Creates an unnamed savepoint.	 * 	 * @param conn	 * 	 * @throws SQLException	 *             if an error occurs	 */	MysqlSavepoint() throws SQLException {		this(getUniqueId());	}	/**	 * Creates a named savepoint	 * 	 * @param name	 *            the name of the savepoint.	 * 	 * @throws SQLException	 *             if name == null or is empty.	 */	MysqlSavepoint(String name) throws SQLException {		if (name == null || name.length() == 0) {			throw SQLError.createSQLException("Savepoint name can not be NULL or empty",					SQLError.SQL_STATE_ILLEGAL_ARGUMENT);		}		this.savepointName = name;	}	/**	 * @see java.sql.Savepoint#getSavepointId()	 */	public int getSavepointId() throws SQLException {		throw SQLError.createSQLException("Only named savepoints are supported.",				SQLError.SQL_STATE_DRIVER_NOT_CAPABLE);	}	/**	 * @see java.sql.Savepoint#getSavepointName()	 */	public String getSavepointName() throws SQLException {		return this.savepointName;	}}