/**************************************************************************************
 * Copyright (c) Jonas Bon?r, Alexandre Vasseur. All rights reserved.                 *
 * http://aspectwerkz.codehaus.org                                                    *
 * ---------------------------------------------------------------------------------- *
 * The software in this package is published under the terms of the LGPL license      *
 * a copy of which has been included with this distribution in the license.txt file.  *
 **************************************************************************************/
package org.codehaus.aspectwerkz.util;

/**
 * Detects Java JVM vendor and Java version
 * Usage: -jvm | -java
 * System.exit code is:
 *      2:BEA, 1:IBM, 0:SUN
 *      MajorMinor (f.e. 15) for Java Major.Minor version or 0
 *
 * @author <a href="mailto:alex@gnilux.com">Alexandre Vasseur</a>
 */
public class EnvironmentDetect {

    public static void main(String a[]) {
        if (a.length < 1) {
            usage();
            show();
            System.exit(-1);
        }
        if (a[0].equals("-jvm")) {
            String vendor = detectJVM();
            if (vendor.indexOf("BEA") >= 0) {
                System.exit(2);
            } else if (vendor.indexOf("IBM") >= 0) {
                System.exit(1);
            } else {
                System.exit(0);
            }
        }
        if (a[0].equals("-java")) {
            String java = detectJava();
            if (java.indexOf("1.5") >= 0) {
                System.exit(15);
            } else if (java.indexOf("1.4") >= 0) {
                System.exit(14);
            } else if (java.indexOf("1.3") >= 0) {
                System.exit(13);
            } else {
                System.exit(0);
            }
        }
        if (a.length > 1) {
            show();
        }
    }

    public static String detectJVM() {
        return System.getProperty("java.vendor").toUpperCase();
    }

    public static String detectJava() {
        return System.getProperty("java.version").toUpperCase();
    }

    public static void show() {
        System.out.println(detectJVM());
        System.out.println(detectJava());
    }

    public static void usage() {
        System.out.println("Usage: -jvm | -java");
    }
}
