Good point, thanks.
On Wed, Oct 14, 2009 at 11:15 PM, Ross Mellgren <dri...@gmail.com> wrote:
> I've been using implicit extensions for this kind of thing, most recently
> expanded error handling via Box. Like this:
> implicit def mappedStringToMappedStringExtension(ms: MappedString):
> MappedStringExtension = MappedStringExtension(ms)
> case class MappedStringExtension(mappedString: MappedString) {
> def orBlank: String = mappedString.is match {
> case null => ""
> case s => s
> }
> def isEmpty: Boolean = mappedString.is match {
> case null => true
> case s if s.length == 0 => true
> case _ => false
> }
> }
> -Ross
> On Oct 14, 2009, at 11:08 PM, David Pollak wrote:
>
>
> On Wed, Oct 14, 2009 at 7:45 PM, Naftoli Gugenheim <naftoli...@gmail.com>
> wrote:
>>
>> 1. Why does MappedString have members such as nonNull(in: String)
>> which don't depend on the MappedString's state? Shouldn't they be in a
>> singleton somewhere?
>
> Maybe they should be, but are they hurting anything where they are?
>
>>
>> 2. It would be nice if there was a method like 'is' that would return
>> null as "". Actually for my particular use case where I'm testing
>> field.is.isEmpty it would be nice if it would have a method like
>> isEmpty that would return true if value==null || value.isEmpty.
>
> You can (1) write a trait and mix it in or (2) write a subclass of
> MappedString and use that.
>
>>
>
>
>
> --
> Lift, the simply functional web framework http://liftweb.net
> Beginning Scala http://www.apress.com/book/view/1430219890
> Follow me: http://twitter.com/dpp
> Surf the harmonics
>
>
>
>
> >
>
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