[rules-dev] Decision table - Otherwise

[Mark Proctor]

on a related note I do plan to add OTHERWISE support at a DRL level, 
just no time to do it right now. Once it's supported at a DRL level, you 
won't need to as much work on figuring out the inverse options etc.

Mark
On 31/03/2011 20:25, Michael Anstis wrote:
> Hi,
>
> I'm adding support for "otherwise" to (for the time being) the guided 
> decision table in Guvnor.
>
> The idea being if you set a cell to represent "otherwise" the 
> generated rule is the opposite of the accumulation of the other cells; 
> perhaps best explained with an example:-
>
> Person( name == )
> Mark
> Kris
> Geoffrey
> <otherwise>
>
> This would generate:-
>
> Person(name not in ("Mark", "Kris", "Geoffrey")
>
> Equals is the simple example, this is my thoughts for the other 
> operators we might like to support:-
>
>     * != becomes "in (<list of the other cells' values)"
>     * < becomes ">= the maximum value of the other cells' values
>
>
> For example:-
>
> Person ( age < )
> 10
> 20
> 30
> <otherwise>
>
> Person ( age >= 30 )
>
>     * <= becomes "> the maximum value of the other cells' values
>     * > becomes "<= the minimum value of the other cells' values
>     * >= becomes "< the minimum value of the other cells' values
>     * "in" becomes "not in (<a list of all values contained in all the
>       other cells' lists of values>)"
>
> For example:-
>
> Person ( name in )
> Jim, Jack
> Lisa, Jane, Paul
> <otherwise>
>
> Person ( name not in ("Jim", "Jack", "Lisa", "Jane", "Paul" ) )
>
>     * I'm not sure there is a simple solution for "matches" and
>       "soundslike" but welcome advice, although a possibility might be
>       to create a compound field constraint:-
>
> Person ( name soundslike )
> Fred
> Phil
>
> not Person ( name soundslike "Fred" || soundslike "Phil" )
>
>
> Would this be considered the most suitable approach?
>
> Inputs and thoughts welcome.
>
> Thanks,
>
> Mike
>
>
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