design by contract

["Gregor J. Rothfuss" <gr...@apache.org>]

i think we should have more code like this:

http://svn.apache.org/viewcvs.cgi/lenya/trunk/src/java/org/apache/lenya/xml/DocumentHelper.java?rev=180303&r1=169810&r2=180303&diff_format=h

if (document == null)
       throw new IllegalArgumentException("illegal usage, parameter
                                          document may not be null");

to enforce the API and make it easier to track down problems to the 
source. as jwkaltz writes in his commit message, NPE are no fun to debug.

this style of programming is known as design by contract

http://c2.com/cgi/wiki?DesignByContract

while java is not eiffel, i still think we can achieve a lot of the 
benefits by using IllegalArgumentException as widely as possible.

WDYT?

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Re: design by contract

[Andreas Hartmann <an...@apache.org>]

Gregor J. Rothfuss wrote:

[...]

> this style of programming is known as design by contract
> 
> http://c2.com/cgi/wiki?DesignByContract
> 
> while java is not eiffel, i still think we can achieve a lot of the 
> benefits by using IllegalArgumentException as widely as possible.
> 
> WDYT?

A wholehearted +1.

-- Andreas


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