/*
 * 
 * Copyright 2004 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * The contents of this file are subject to the Sun Community Source
 * License v3.0/Jini Technology Specific Attachment v 1.0 (the
 * "License"). You may not use this file except in compliance with the
 * License. You may obtain a copy of the License at
 * http://wwws.sun.com/software/jini/licensing/SCSL3_JiniTSA1.html.
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and limitations
 * under the License.
 * 
 * The Reference Code is Jini Technology Core Platform code, v2.0. The
 * Developer of the Reference Code is Sun Microsystems, Inc.
 * 
 * Contributor(s): Sun Microsystems, Inc.
 * 
 * The contents of this file comply with the Jini Technology Core
 * Platform Compatibility Kit, v2.0A.
 * 
 * Tester(s): Sun Microsystems, Inc.
 * 
 * Test Platform(s):
 * Java 2 SDK, Standard Edition, Version 1.4.2_03 for Solaris(TM)SPARC/x86
 * Java 2 SDK, Standard Edition, Version 1.4.2_03 for Linux (Intel x86)
 * Java 2 SDK, Standard Edition, Version 1.4.2_03 for Windows (Intel Platform)
 * 
 */
package com.sun.jini.reggie;

import java.lang.reflect.Method;
import java.util.logging.Level;
import java.util.logging.Logger;
import net.jini.core.lookup.ServiceID;

/**
 * Miscellaneous common utility methods.
 *
 * @author Sun Microsystems, Inc.
 *
 */
class Util {

    /**
     * Returns Method object for specified method, which should always exist.
     */
    static Method getMethod(Class type, String name, Class[] paramTypes) {
	try {
	    return type.getMethod(name, paramTypes);
	} catch (NoSuchMethodException e) {
	    throw new AssertionError(e);
	}
    }

    /**
     * Checks if the value of the given service ID to register conforms to the
     * ServiceID specification, logging a message to the provided logger at the
     * specified logging level if it doesn't.
     */
    static void checkRegistrantServiceID(ServiceID serviceID,
					 Logger logger,
					 Level level)
    {
	if (logger.isLoggable(level)) {
	    int variant =
		(int) (serviceID.getLeastSignificantBits() >> 62) & 0x3;
	    if (variant != 2) {
		logger.log(level, "{0} has invalid variant {1}",
			   new Object[]{ serviceID, new Integer(variant) });
	    }
	    int version =
		(int) (serviceID.getMostSignificantBits() >> 12) & 0xF;
	    if (!(version == 1 || version == 4)) {
		logger.log(level, "{0} has invalid version {1}",
			   new Object[]{ serviceID, new Integer(version) });
	    }
	}
    }
}
