public Object getObjectInstance(Object refObj,
    Name nm,
    Context ctx,
    Hashtable env) throws Exception 
{
		Reference ref = (Reference) refObj;
		String className = ref.getClassName();
		if ((className != null)
				&& (className.equals(DATA_SOURCE_CLASS_NAME) || className
						.equals(POOL_DATA_SOURCE_CLASS_NAME) ||
						className.equals(XA_DATA_SOURCE_CLASS_NAME))) {
			MysqlDataSource dataSource = null;
			try {
				dataSource = (MysqlDataSource) Class.forName(className)
						.newInstance();
			} catch (Exception ex) {
				throw new RuntimeException("Unable to create DataSource of "
						+ "class '" + className + "', reason: " + ex.toString());
			}
			int portNumber = 3306;
			String portNumberAsString = nullSafeRefAddrStringGet("port", ref);
			if (portNumberAsString != null) {
				portNumber = Integer.parseInt(portNumberAsString);
			}
			dataSource.setPort(portNumber);
			String user = nullSafeRefAddrStringGet(NonRegisteringDriver.USER_PROPERTY_KEY, ref);
			if (user != null) {
				dataSource.setUser(user);
			}
			String password = nullSafeRefAddrStringGet(NonRegisteringDriver.PASSWORD_PROPERTY_KEY, ref);
			if (password != null) {
				dataSource.setPassword(password);
			}
			String serverName = nullSafeRefAddrStringGet("serverName", ref);
			if (serverName != null) {
				dataSource.setServerName(serverName);
			}
			String databaseName = nullSafeRefAddrStringGet("databaseName", ref);
			if (databaseName != null) {
				dataSource.setDatabaseName(databaseName);
			}
			String explicitUrlAsString = nullSafeRefAddrStringGet("explicitUrl", ref);
			if (explicitUrlAsString != null) {
				if (Boolean.valueOf(explicitUrlAsString).booleanValue()) {
					dataSource.setUrl(nullSafeRefAddrStringGet("url", ref));
				}
			}
			dataSource.setPropertiesViaRef(ref);
			return dataSource;
		}
		// We can't create an instance of the reference
		return null;
}

DOCUMENT ME!