Interface extension

Posted by user877329 on Programmers See other posts from Programmers or by user877329
Published on 2012-12-13T18:25:39Z Indexed on 2012/12/13 23:19 UTC
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design

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interfaces

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polymorphism

Suppose that I have an input stream interface, which defines a method for reading data. I also have a seekable interface which defines a method for seeking. A natural way of defining a input file is then to implement both input stream and seekable.

I want to construct a data decoder from the input stream interface so I can read data from a file or from another stream. The problem is that I also want to implement seek functionality to the data decoder, since I want to be able to step individual records not raw bytes. This is not possible if I only provide an input stream, which does not have the bytewise seek method.

Should I skip the seekable interface and add the seek method to input stream instead and force all streams to at least leave it as a nop.

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