On Jul 10, 11:11 pm, Jeppe Nejsum Madsen <[email protected]> wrote:
> Hi,
>
> I understand (I think :-) the use of Option/Box to avoid the common
> NPE. Also that map/for gives a nice way to conditionally do stuff with
> something that can be Empty.
>
> But sometimes the Box just have to be full and if it isn't, this is a
> logic error that is better handled than silently ignored.
val myBox: Box[SomeType] = ...
myBox or (alternative-logic)
The or function returns the Box content if the Box is full or the
result of the alternative-logic expression if the Box is Empty or
Failure for that matter.
You can also pattern match such as
myBox match {
case Full(x) =>
case Failure(msg,ex,chain) => handle the Failure if you need to
case _ => handle Empty here
}
>
> So what is a good pattern for doing this?
>
> On a related note: Is there a way to (globally) catch exceptions/errors that
> shows up in a Lift app?
>
> I foundhttp://wiki.liftweb.net/index.php/HowTo_use_error_pagesbut this
> doesn't seem up to date....
Please see LiftRules.exceptionHandler ... yeah I need to update that
wiki.
>
> /Jeppe
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