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List:       fdo-internals
Subject:    Re: [fdo-internals] Why is FdoISQLDataReader not derived
From:       Mateusz Loskot <mateusz () loskot ! net>
Date:       2008-08-23 5:55:29
Message-ID: 48AFA651.1020403 () loskot ! net
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Baumann, Konstantin wrote:
> Hi!
>  
> Is there a reason, why FdoISQLDataReader is not derived from FdoIReader,
> but directly from FdoIDisposable?

Konstantin,

Good question, but I don't know the answer.
Considering definition of FdoIReader and FdoISQLDataReader, the latter
should be a subtype of the former:
- public interface of both classes is the same
- both are abstract classes

One of potential benefits of such interitance, would be
substitutability in terms of Liskov Substitution Principle (LSP).

Best regards,
-- 
Mateusz Loskot, http://mateusz.loskot.net
Charter Member of OSGeo, http://osgeo.org
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