SystemInfo.java

package net.sf.openrocket.arch;

import java.io.File;
import java.util.Locale;

import net.sf.openrocket.util.BugException;

public class SystemInfo {
	
	
	/**
	 * Enumeration of supported operating systems.
	 * 
	 * @see <a href="http://lopica.sourceforge.net/os.html">JNLP os and arch Value Collection</a>
	 * @author Sampo Niskanen <sampo.niskanen@iki.fi>
	 */
	public enum Platform {
		WINDOWS,
		MAC_OS,
		UNIX;
	}
	
	
	/**
	 * Return the current operating system.
	 * 
	 * @return	the operating system of the current system.
	 */
	public static Platform getPlatform() {
		String os = System.getProperty("os.name").toLowerCase(Locale.ENGLISH);
		
		if (os.indexOf("win") >= 0) {
			return Platform.WINDOWS;
		} else if (os.indexOf("mac") >= 0) {
			return Platform.MAC_OS;
		} else {
			/*
			 * Assume UNIX otherwise, e.g. "Linux", "Solaris", "AIX" etc.
			 */
			return Platform.UNIX;
		}
	}
	
	
	
	
	/**
	 * Return the application data directory of this user.  The location depends
	 * on the current platform.
	 * <p>
	 * The directory will not be created by this method.
	 * 
	 * @return	the application directory for OpenRocket
	 */
	public static File getUserApplicationDirectory() {
		final String homeDir = System.getProperty("user.home");
		final File dir;
		
		switch (getPlatform()) {
		case WINDOWS:
			String appdata = System.getenv("APPDATA");
			if (appdata != null) {
				dir = new File(appdata, "OpenRocket/");
			} else {
				dir = new File(homeDir, "OpenRocket/");
			}
			break;
		
		case MAC_OS:
			dir = new File(homeDir, "Library/Application Support/OpenRocket/");
			break;
		
		case UNIX:
			dir = new File(homeDir, ".openrocket/");
			break;
		
		default:
			throw new BugException("Not implemented for platform " + getPlatform());
		}
		
		return dir;
	}
	
}