# 94 - Creating SOLID Code: Interface Segregation Principle

Great screencast and explanation!

Just two questions.

Inheriting interfaces would that not be a problem for classes that just needs to implement the query and save data methods? The queryreportdata method would be 'not implemented'.

A class implementing an interface such as IDataAccess not violate the SRP? It is both responsible for querying data and saving data?

Stephen:

That's a great point -- my idea for inheriting IDataAccess from IReportDataAcccess was really to demonstrate that its possible to inherit Interfaces in the same way that people typically look at inheriting classes and that this represents a feasible way to both decompose FAT interfaces into smaller, more focused interfaces and at the same time ensure reverse-compatibility with any existing code rather than to ensure that the existing 'legacy' interface of IDataAccess adhered to to SRP in all apects of it.

But, yes, absolutely a class that implemented the newly-refactored IDataAccess would nearly-certainly be in violation of SRP both in spirit and in practice :)

-Steve B.

Hi. I love this format. Quick and easy. Appreciate the effort.

But I thought that ISP was from a consumer POV, not the implementer.

That, if a set of components are only consuming a subset of the functions in an interface, then this subset should be its own interface.

http://www.objectmentor.com/resources/articles/isp.pdf

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