/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

	Copyright (c) Non, Inc. 1998 -- All Rights Reserved

PACKAGE:	net.non.applets
FILE:		PropertyLister.java

AUTHOR:		John D. Mitchell, Apr 28, 1998

REVISION HISTORY:
	Name	Date		Description
	----	----		-----------
	JDM	98.04.28   	Initial version.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/


package net.non.applets;


// Standard Java Core packages:

import java.io.* ;
import java.lang.* ;
import java.net.* ;
import java.util.* ;

import java.applet.* ;
import java.awt.* ;


/**
 ** This example applet just prints out all of the system properties
 ** available to the applet.<br><br>
 **
 ** @author	John D. Mitchell, Non, Inc., Apr 28, 1998
 **
 ** @version 0.5
 **
 **/
public class PropertyLister extends Applet
    {
    private TextArea textArea = new TextArea (20, 70);
    private String key = null;
    private String value = null;


    public void init()
	{
	add ("Center", textArea);

	try
	    {
 	    // Alas, rather than doing something intelligent when trying
	    // to foil crackers and other nefarious folks, the following
 	    // will likely trigger a security exception if your applet
	    // is running in a restricted environment (like a browser).
 	    try 
 		{
 		Properties props = System.getProperties();
 		Enumeration e = props.propertyNames();
 		while (e.hasMoreElements())
 		    {
 		    key = (String) e.nextElement();
 		    value = props.getProperty (key);
 
 		    textArea.appendText ("Key :" + key +
 					 ": = :" + value + ":\n");
 		    }
 		}
 	    catch (SecurityException se)
 		{
		// Oh well, no access to everything.
		// The following list of properties are generally
		// available in any context.
		String keys [] =
		    {
		    "java.vendor", "java.vendor.url",
		    "java.version", "java.class.version",
		    "os.name", "os.arch", "os.version",
		    "file.separator", "path.separator",
		    "line.separator", "browser",
		    "browser.vendor", "browser.version"
		    };

		for (int i = 0; i < keys.length; i++)
		    {
		    try 
			{
			key = keys[i];
			value = System.getProperty (key);
			textArea.appendText ("Key :" + key +
					     ": = :" + value + ":\n");
			}
		    catch (SecurityException see) { ; }
		    }
		}
	    }
	catch (Exception exception)
	    {
	    exception.printStackTrace();
	    }
	}
    }