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package org.openslx.imagemaster.util;
import java.util.Random;
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 friendsly 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 );
}
}
/**
* Static {@link Random} instance.
*/
private static final Random random = new Random();
/**
* Return a random integer in the range of 0 (inclusive) and
* n (exclusive). Uses the internal static instance of {@link Random},
* so you don't have to deal with instances everywhere.
*
* @param n the upper bound (exclusive)
* @return number between 0 (inclusive) and n (exclusive)
*/
public static int randomInt( int n )
{
return random.nextInt( n );
}
}
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