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Message-ID: <4C04E9EA.3020903@gmail.com>
Date: Tue, 01 Jun 2010 07:07:22 -0400
From: Phil Steitz <phil.steitz@gmail.com>
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To: Commons Developers List <dev@commons.apache.org>
Subject: Re: [math] incompatible change in r936295
References: <4C04561D.9000407@gmail.com>
 <AANLkTik00-igg2Xr74LReO5hGlhLdUUJcKimI1ila1EW@mail.gmail.com>
 <20100601093842.GG12545@dusk.harfang.homelinux.org>
In-Reply-To: <20100601093842.GG12545@dusk.harfang.homelinux.org>
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Gilles Sadowski wrote:
>>> Sorry I did not notice this before.  I see it now flagged by the
>>> Clirr report.  The problem is here:
>>>
>>> -    public BivariateRealFunction interpolate(final double[] xval,
>>> -                                             final double[] yval,
>>> -                                             final double[][] zval)
>>> +    public BicubicSplineInterpolatingFunction interpolate(final
>>>
>>> Changing the return type of a function is an incompatible change.
>>> We should revert this change.
>>>
>> Even though BicubicSplineInterpolatingFunction implements
>> BivariateRealFunction ?
> 
> Hence, this is not an incompatible change.

Unfortunately, no.  See
http://commons.apache.org/releases/versioning.html
http://java.sun.com/docs/books/jls/third_edition/html/binaryComp.html
(13.4.15)
http://wiki.eclipse.org/Evolving_Java-based_APIs_2

Clients that recompile and just use the method will not break.
Clients that do not recompile and/or extend the class may break.

Phil
> 
> Gilles
> 
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