Preconditioner is inspired by Google's Guava Precondions class. It allows to use a Preconditions like API with any kind of Exception:
Preconditioner precondition = new ExceptionReflectionPreconditioner(MyException.class);
precondition.check("TEST".equals(arg), "%s is not equals %s", arg, "TEST");instead of
if(! "TEST".equals(arg))
{
throw new MyException(String.format("%s is not equals %s", arg, "TEST"));
}