public SortProcess(String args[]) throws Exception
	{
		super(args);
		if (args.length < 2) {
			System.out.println("usage: SortProcess <inputFile> <outputFile>");
			return;
		}
        inputStream = new TransactionalFileInputStream(new File(arguments.get(0)));
        outputStream = new TransactionalFileOutputStream(new File(arguments.get(1)));
        
        step = 0;
        line = "";
	}