/*
 * Enhydra Java Application Server Project
 * 
 * The contents of this file are subject to the Enhydra Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License on
 * the Enhydra web site ( http://www.enhydra.org/ ).
 * 
 * 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 terms governing rights and limitations
 * under the License.
 * 
 * The Initial Developer of the Enhydra Application Server is Lutris
 * Technologies, Inc. The Enhydra Application Server and portions created
 * by Lutris Technologies, Inc. are Copyright Lutris Technologies, Inc.
 * All Rights Reserved.
 * 
 * Contributor(s):
 * 
 * $Id: JavaVersion.java,v 1.15 2005/06/13 09:26:06 draganr Exp $
 */

package com.lutris.util;

/*
 * JavaVersion can be used as a standalone main class
 * to print the major version number of the executing JVM
 * or it can return the version using the getVersion() method.
 *
 * @version $Revision: 1.15 $
 * @author Shawn McMurdo
 * @author Jason Hunter (jhunter@hyperreal.org)
 */
public class JavaVersion {

    static {
	setVersion();
    }
    public static String javaVersion;

    public static void main(String argv[]) {
        System.out.println(javaVersion);
    }

    public static String getVersion() {
	return javaVersion;
    }

    private static void setVersion() {
	// From Jason Hunter via Jakarta Tomcat
	// This method includes software developed by the
	// Apache Software Foundation <http://www.apache.org/>.

        // Determine the Java version by looking at available classes
        // java.lang.StrictMath was introduced in JDK 1.3
        // java.lang.ThreadLocal was introduced in JDK 1.2
        // java.lang.Void was introduced in JDK 1.1
        // Count up version until a NoClassDefFoundError ends the try
        try {
            javaVersion = "1.0";
            Class.forName("java.lang.Void");
            javaVersion = "1.1";
            Class.forName("java.lang.ThreadLocal");
            javaVersion = "1.2";
            Class.forName("java.lang.StrictMath");
            javaVersion = "1.3";
        }
        catch (Throwable t) {
        }
    }
}