On Jul 3, 2012, at 7:18 PM, Vincent Massol wrote:

> Hi Andreas,
> 
> On Jul 3, 2012, at 11:10 AM, Andreas Jonsson wrote:
> 
>> Hi,
>> 
>> This vote is about adding the following three clirr excludes:
>> 
>> * This interface is completely refactored:
>> 
>> <exclude>org/xwiki/chart/model/ChartModel</exclude>
>> 
>> * This class is removed:
>> 
>> <exclude>org/xwiki/chart/model/DefaultChartModel</exclude>
> 
> Was this class supposed to be public before or was it an error?
> 
>> 
>> * The constants 'SOURCE' and 'PARAMS' are removed from this interface:
>> 
>> <exclude>org/xwiki/rendering/macro/chart/ChartDataSource</exclude>
> 
> The question is: is there a reasonably easy way to not cause backward compat 
> breakages for those classes?
> 
> From what I see this miss creating completely new interfaces for at least:

Sorry, I meant "means", not "miss"...

-Vincent

> ChartModel
> ChartGenerator
> DataSource
> ChartDataSource
> 
> So in essence this means deprecating lots of classes in 
> xwiki-platform-chart-renderer and introducing lots of new ones (although they 
> can share common code).
> 
> So I think it's a bit too much work for the problem at hand since this API is 
> not one of the most used API and this is likely to not impact many users.
> 
> Also:
> * The chart module is not used anywhere else in the platform except in 
> oldcore by the old chart plugin
> * I'd like use to deprecate and retire the old chart plugin
> 
> Thus the chart macro and the other chart modules are good candidates to be 
> non core extensions and thus a user who really wants to stay on the 
> oldversion could do so (provided he doesn't use the old chart plugin).
> 
>> 
>> I am refactoring the chart macro and the interface 'ChartModel' is could 
>> previously only be used for producing table-like datasets, but the jfree 
>> chart library can produce plots from a wide range of dataset types.  So the 
>> new version of the interface is instead used for delivering the dataset and 
>> the axis configuration to the chart generator.
>> 
>> I have deliberately choosed to not try abstracting away the fact that the 
>> chart macro uses the jfree chart library.  Doing so would require 
>> introducing a large number of wrapper classes that would duplicate the 
>> functionality existing classes and it would still not be particularly easy 
>> to just plug in another chart library.
> 
> +1 to that
> 
>> Here is my +1.
> 
> +1 too
> 
> Thanks
> -Vincent
> 
>> 
>> Best Regards,
>> 
>> /Andreas

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