Hi,
I'm reading through DROOLS manual and can't understand the difference /
explanations regarding predicate expression (Figure 3.17) and return value
expression (Figure 3.18). The manual gives two examples of the same thing
done two different ways:
Predicate expression:
Person( girlAge : age, sex = "F" )
Person( boyAge : age -> ( girlAge.intValue() == boyAge.intValue() + 2 ), sex
= 'M' )
Return value expression:
Person( girlAge : age, sex == "F" )
Person( age == ( new Integer(girlAge.intValue() + 2) ), sex == 'M' )
While the 'return value' expression is more or less clear, I can't
understand the semantics of 'predicate' ('->') operator. Can anyone decode
this? What's the difference between the two? When each of the ways should be
used and why?
Thanks!
Vlad
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