/*
 * Copyright (c) 2007, 2012, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package com.sun.max.platform;

import com.sun.max.annotate.*;
import com.sun.max.program.*;

/**
 * Enumerated type for operating systems.
 */
public enum OS {

    DARWIN("Darwin"),
    LINUX("Linux"),
    SOLARIS("Solaris"),
    WINDOWS("Windows"),
    MAXVE("MaxVE");

    /**
     * The identifier of this OS as part of a class name.
     */
    public final String className;

    public int serial() {
        return ordinal();
    }
    /**
     * Returns a string that can be used in a package name.
     */
    public String asPackageName() {
        return name().toLowerCase();
    }

    private OS(String className) {
        this.className = className;
    }

    public static OS fromName(String name) {
        return OS.valueOf(name.toUpperCase());
    }

    private static OS getCurrent() {
        final String name = System.getProperty("os.name");
        if (name.equals("Linux")) {
            return LINUX;
        }
        if (name.equals("SunOS")) {
            return SOLARIS;
        }
        if (name.equals("Mac OS X") || name.equals("Darwin")) {
            return DARWIN;
        }
        if (name.equals("MaxVE")) {
            return MAXVE;
        }
        if (name.contains("Windows")) {
            return WINDOWS;
        }
        throw ProgramError.unexpected("unknown OS: " + name);
    }

    @RESET
    private static OS current;

    public static OS current() {
        if (current == null) {
            current = getCurrent();
        }
        return current;
    }
}