[Bioc-devel] S4 overwrite inspector of virtual class

[Gabe Becker]

Zach,

Is an inspector a method you define on your classes? I'm not quite
following what you mean by your question. AFAIK inspectors are not
generally a thing in R (at least that go by that name).

~G

On Mon, Aug 15, 2016 at 9:42 AM, Zach Skidmore <zskidmor at wustl.edu> wrote:

> Hi All,
>
> I'm currently transforming the GenVisR package into an Object Oriented
> system. Currently I have a virtual class and several child-classes. I am
> wondering if there is a way to tell R to use the inspector of the virtual
> class only if the inspector of a child class in not defined.
>
> For example say I had a class to store versions of a file-type and I have
> a slot in the class to store the position. Between different versions of
> the file-type there may be small differences (for example Chromosome may be
> capitalized in version 2,3,4 but not version 1). Ideally the child classes
> for 2,3,4 would be able to inherit the inspector from the virtual class to
> check the chromosome name and I would define a separate inspector for
> version 1 which is different.
>
> Any thoughts? Currently both inspectors are called (virtual and the
> appropriate sub-class), meaning if i added more versions in the future I
> would have to re-write the virtual and child class. Whereas if I could say
> ignore the virtual (i.e. default) inspector if another is defined I would
> only have to write the child class inspector in the future.
>
> Hopefully this makes sense, let me know if it doesn't or if i'm violating
> a core OO principle, i'm relatively new to object oriented programming.
>
> Thanks, Zach!
>
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-- 
Gabriel Becker, Ph.D
Associate Scientist
Bioinformatics and Computational Biology
Genentech Research

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