package org.openslx.satellitedaemon.util;

import org.apache.log4j.Logger;

public class Util
{
	private static Logger log = Logger.getLogger( Util.class );

	/**
	 * Check if the given object is null, abort program if true. An optional
	 * message to be printed can be passed. A stack trace will be printed, too.
	 * Finally the application terminates with exit code 2.
	 * 
	 * This comes in handy if something must not be null, and you want user
	 * friendly output. A perfect example would be reading settings from a
	 * config file. You can use this on mandatory fields.
	 * 
	 * @param something
	 *           the object to compare to null
	 * @param message
	 *           the message to be printed if something is null
	 */
	public static void notNullFatal( Object something, String message )
	{
		if ( something == null ) {
			if ( message != null )
				log.fatal( "[NOTNULL] " + message );
			log.warn( Thread.currentThread().getStackTrace().toString() );
			System.exit( 2 );
		}
	}
}