[rules-users] newbie question on "when" condition syntax

[mashup]

wow, you guys are good, nice observation Raffi I had not considered that but
this is all making me comprehend how Drools works. Actually I think I need
to switch my brain on! Java is so easy it doesn't tend to require much
thought, now I'm having to think about this stuff it hurts :-)

thanks

Richard


Raffi Khatchadourian wrote:
> 
> On Fri  2.May'08 at 10:05:20 +0100, Anstis, Michael (M.) wrote:
>>The "when" section matches fact (object) patterns, so your requirement
>>could be written as:-
>> 
>>when there is a Test Fact 'A' and another Test Fact 'B' where "the 'x'
>>property of 'A'" equals "the 'y' property of fact 'B' plus 1" then.....
>> 
>>This would become:-
>> 
>>rule "Rule 1"
>>when
>>    Test( $y : y )
>>    Test( x == ($y + 1) )
> 
> Actually, please correct me if I am mistaken, but is this condition
> correct? I believe that the original question is that for a single
> instance of class Test t, fire the rule when t.x == t.y + 1 (where 't'
> refers to the *same* instance of class Test). I believe the rule above
> would match any instance of class Test whose x value is equal to the
> value of the instance field y from *any* instance of class Test plus 1.
> Does that make sense?
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> 
> 

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