import java.lang.String;

public class SystemUtil
{
    /**
     * Some operating system constants are below.
     * Just a few things to note...
     *
     * - The only ones I'm likely to be testing are Linux
     *   and (ugh) Windows.
     *
     * - I assume the Mac OS string returned by Java
     *   is referring to OS X and not any of it's earlier
     *   cousins.
     *
     * - Just some conventions that can make using
     *   these a bit easier. Unix-like OS's have odd
     *   constants. Unsupported is 0, so you can use
     *   our good friend the exclamation point in
     *   cond-statements.
     *
     * - Do not absolutely rely on these. I'm not sure
     *   why Java would lie, but IT MIGHT. Or who knows,
     *   maybe Microsoft will release "Windows Linux Edition"
     *   or something that will completely confuse this function.
     *   That would not be good.
     */

    /** Integer constant for GNU/Linux. */
    public static final int OS_LIN = 1;
    /** Integer constant for Windows. */
    public static final int OS_WIN = 2;
    /** Integer constant for BSD. */
    public static final int OS_BSD = 3;
    /** Integer constant for Mac OS X. */
    public static final int OS_MAC = 5;
    /** Integer constant for Solaris. */
    public static final int OS_SOL = 7;
    /** Integer constant for an unsupported OS. */
    public static final int OS_UNS = 0;

    /**
     * Try to determine which operating system we're in.
     *
     * @return A guess of which OS this is.
     * @author Tom Arnold
     */
    public static int getOS()
    {
        String prop = System.getProperty("os.name").toLowerCase();

        if (prop.contains("linux"))
        {
            return OS_LIN;
        }

        else if (prop.contains("windows"))
        {
            return OS_WIN;
        }

        else if (prop.contains("bsd"))
        {
            return OS_BSD;
        }

        else if (prop.contains("solaris"))
        {
            return OS_SOL;
        }

        else if (prop.contains("mac"))
        {
            return OS_MAC;
        }

        else
        {
            return OS_UNS;
        }
    }
}