OperatingSystem.java

package net.minecraft.launcher;

import java.io.File;
import java.io.IOException;
import java.net.URI;

public enum OperatingSystem {
    LINUX("linux", new String[]{"linux", "unix"}),
    WINDOWS("windows", new String[]{"win"}),
    OSX("osx", new String[]{"mac"}),
    UNKNOWN("unknown", new String[0]);

    private final String name;
    private final String[] aliases;

    private OperatingSystem(String name, String[] aliases) {
        this.name = name;
        this.aliases = (aliases == null ? new String[0] : aliases);
    }

    public String getName() {
        return this.name;
    }

    public String[] getAliases() {
        return this.aliases;
    }

    public boolean isSupported() {
        return this != UNKNOWN;
    }

    public String getJavaDir() {
        String separator = System.getProperty("file.separator");
        String path = System.getProperty("java.home") + separator + "bin" + separator;

        if ((getCurrentPlatform() == WINDOWS) &&
                (new File(path + "javaw.exe").isFile())) {
            return path + "javaw.exe";
        }

        return path + "java";
    }

    public static OperatingSystem getCurrentPlatform() {
        String osName = System.getProperty("os.name").toLowerCase();

        for (OperatingSystem os : values()) {
            for (String alias : os.getAliases()) {
                if (osName.contains(alias)) return os;
            }
        }

        return UNKNOWN;
    }

    public static void openLink(URI link) {
        try {
            Class desktopClass = Class.forName("java.awt.Desktop");
            Object o = desktopClass.getMethod("getDesktop", new Class[0]).invoke(null, new Object[0]);
            desktopClass.getMethod("browse", new Class[]{URI.class}).invoke(o, new Object[]{link});
        } catch (Throwable e) {
            Launcher.getInstance().println("Failed to open link " + link.toString(), e);
        }
    }

    public static void openFolder(File path) {
        String absolutePath = path.getAbsolutePath();
        OperatingSystem os = getCurrentPlatform();

        if (os == OSX) {
            try {
                Runtime.getRuntime().exec(new String[]{"/usr/bin/open", absolutePath});

                return;
            } catch (IOException e) {
                Launcher.getInstance().println("Couldn't open " + path + " through /usr/bin/open", e);
            }
        } else if (os == WINDOWS) {
            String cmd = String.format("cmd.exe /C start \"Open file\" \"%s\"", new Object[]{absolutePath});
            try {
                Runtime.getRuntime().exec(cmd);
                return;
            } catch (IOException e) {
                Launcher.getInstance().println("Couldn't open " + path + " through cmd.exe", e);
            }
        }
        try {
            Class desktopClass = Class.forName("java.awt.Desktop");
            Object desktop = desktopClass.getMethod("getDesktop", new Class[0]).invoke(null, new Object[0]);
            desktopClass.getMethod("browse", new Class[]{URI.class}).invoke(desktop, new Object[]{path.toURI()});
        } catch (Throwable e) {
            Launcher.getInstance().println("Couldn't open " + path + " through Desktop.browse()", e);
        }
    }
}