versionchecker.java

java语言开发的P2P流媒体系统

/* Stream-2-Stream - Peer to peer television and radio
 * October 13, 2005 - This file has been modified from the original P2P-Radio source
 * Project homepage: http://s2s.sourceforge.net/
 * Copyright (C) 2005-2006 Jason Hooks
 */

/* 
 * P2P-Radio - Peer to peer streaming system
 * Project homepage: http://p2p-radio.sourceforge.net/
 * Copyright (C) 2003-2004 Michael Kaufmann <[e-mail]>
 * 
 * ---------------------------------------------------------------------------
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * ---------------------------------------------------------------------------
 */

package p2pradio.tools;

import p2pradio.Radio;
import p2pradio.Messages;
import p2pradio.logging.Logger;


/**
 * Checks if the Java version is at least 1.4. If not, it
 * displays an error message (in the console and in a GUI window) and exits.
 * If yes, it executes {@link Radio#main(java.lang.String[])}.
 *
 * @author Michael Kaufmann
 */
public class VersionChecker
{
	private VersionChecker()
	{
		// Keine Instanzen
	}
	
	public static void startRadio(String args[], boolean isServer)
	{
		if (tooOldJavaVersion())
		{
			String msg = Messages.getString("VersionChecker.TOO_OLD_JAVA_VERSION", "1.4"); //$NON-NLS-1$ //$NON-NLS-2$
			System.out.println(msg);
			
			try
			{
				javax.swing.JOptionPane.showMessageDialog(null, msg, Messages.getString("VersionChecker.TOO_OLD_JAVA_VERSION_TITLE"), javax.swing.JOptionPane.ERROR_MESSAGE); //$NON-NLS-1$
			}
			catch (Throwable t)
			{	
				// Nichts tun, vielleicht steht gar kein Desktop
				// zur Verf黦ung (gibt einen InternalError!)
			}
						
			System.exit(1);
		}
		try
		{
			new Radio(args, isServer); //We are the server
		}
		catch (Exception e)
		{
			Logger.severe("Radio", "INTERNAL_ERROR", e); 	 //$NON-NLS-1$ //$NON-NLS-2$
		}
		// Radio starten
	}
	
	private static boolean tooOldJavaVersion()
	{
		String version;
		
		try
		{
			version = System.getProperty("java.version").toLowerCase().substring(0, 3); //$NON-NLS-1$
		}
		catch (Exception e)
		{
			// Dann wird die Version eben nicht 黚erpr黤t
			return false;
		}
		
		// Es kann sein, dass diese alten Versionen die Klassendateien gar nicht
		// mehr lesen k鰊nen. Aber Sicherheit geht vor...
		return (version.equals("1.0") || version.equals("1.1") || version.equals("1.2") || version.equals("1.3")); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
	}
}