From: Damjan Rems <d_rems@...>
Date: 2008-03-03T17:07:09+09:00
Subject: Understanding ruby classes


This question is all about me not understanding how ruby classes work.

I have three print classes. myPrint which is abstract class and
implements common methods for other two classes which are myPrint2PDF
and myPrint2HTML. They implement all the troubles of output to PDF or
HTML format. Without too much code, implementation looks like this:

class myPrint
def printHDR
end
....
end

class myPrint2PDF << myPrint
....
end

class myPrint2HTML << myPrint
....
end


Then I have fourth class which implements the job which has to be done.

class myPrint001 << myPrint2PDF
def printHDR
  image 'image.jpg' 20, 1
  print 'some header text' 1,5
  ...
end
def doJob
  print 'some text' 1,5
end
end

Here is my catch 22. I would REALLY like to call my implementation
class like this:
pr = myPrint001 :format => 'HTML' or
pr = myPrint001 :format => 'PDF'
pr.doJob

I have made statement 'class myPrint001 << myPrint2PDF' intentionaly
wrong and I know it does not provide the real solution, but this is how
it works for now.

What would be the best (ruby) solution to this problem.


by
TheR
-- 
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