[Pharo-project] [ENH]: FileReference subclasses

Igor Stasenko siguctua at gmail.com
Sun Aug 5 18:55:24 CEST 2012


Will it make more sense to have direct conversion methods i.e.:

someFileReference asSTFileReference specificBehavior.

because detecting the file type on it's extension is too unreliable , IMO.

On 4 August 2012 21:56, Sean P. DeNigris <sean at clipperadams.com> wrote:
> Thoughts? Comments? Opinions?
>
> Issue 6525: [ENH]: FileReference subclasses
> http://code.google.com/p/pharo/issues/detail?id=6525
>
> Different types of files have different behaviors. Currently, we need to add
> all those behaviors (e.g. #fileIn) to FileReference, even though they only
> make sense with a fraction of instances.
>
> I propose that we match the filename against FileReference subclasses. The
> following is a conversation starter. It works with strings...
>
> Usage:
> '/Users/sean/start.st' asFileReference. "anStFileReference"
> '/Users/sean/start.unknown' asFileReference. "aFileReference"
> 'file:///Users/me.st' asUrl asFileReference "not handled by current
> implementation, will default to aFileReference"
>
> For example, I can create a custom .st file subclass, with:
>   StFileReference>>isClassFor: aResolvable
>         (aResolvable isKindOf: String) ifFalse: [ ^ false ]. "just a hack to avoid
> DNU"
>         ^ aResolvable endsWith: '.st'.
>
> Enhancing the following method will catch aString asFileReference, but not
> e.g. aFileUrl asFileReference:
>     FileSystem>>referenceTo: aResolvable
>         "Answer a reference to the argument from the context of the receiver
> filesystem.
>                 Example: FSFilesystem disk referenceTo: 'plonk.taz'"
>
>         | referenceClass |
>         referenceClass := FileReference allSubclasses
>                 detect: [ :e | e isClassFor: aResolvable ]
>                 ifNone: [ FileReference ].
>
>         ^ referenceClass
>                 fileSystem: self
>                 path: (self pathFromObject: aResolvable).
>
>
>
> --
> View this message in context: http://forum.world.st/ENH-FileReference-subclasses-tp4643116.html
> Sent from the Pharo Smalltalk mailing list archive at Nabble.com.
>



-- 
Best regards,
Igor Stasenko.



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