[sent previously, please ignore if already rec'd]
A basic OOP question, I guess.
I have a file from which I want to extract some data. The data of
interest may be towards the end of the file at position A, defined by
schema A; or it may be in the file at variable positions near the
beginning of the file which are defined by a combination of schema B
and the data in the file; or the data of interest may be in the file
both ways (and the data may be different).
I'd like to write a class for the data extraction. In my mind I'd
have one overall class for the data extraction with attributes for the
two possible sets of data extracted. I am thinking It'd be nice if
these two attributes were two different classes themselves. Something
like this:
class Reader:
def __init__(self, filePath=""):
try:
self.fileObj=file(filePath,"r")
except:
self.errorMsg="File opening error"
self.dataA=SchemaA()
self.dataB=SchemaB()
...
class SchemaA():
def __init__(self):
self.data={}
...
class SchemaB():
def __init__(self):
self.data={}
...
I'm struggling with a mind stuck in functional programming mode and
also lazy from simple scripting, thus my questions:
- Is there any problem with structuring my classes like this? I
assume that using SchemaA and SchemaB within Reader would be no
different than using any other classes within that class (it all gets sorted
out in compilation).
- Is it possible, and is there any advantage to, embedding the
classes (SchemaA and SchemaB) within the Reader class? The Schema
classes would not be used elsewhere.
- Are there performance considerations to the structure I use?
Thanks in advance,
Eric
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