[rules-users] Checking for a lack of an object
How do I fire a rule if an object with certain characterstics does not
exists.
For example my class Foo, if I have a rule:
rule "Identify Foos with values"
when
Foo(stringProp=="blah", intProp==5)
then
System.err.println("A Foo was found!");
end
So how do I check for lack of existence of an object with certain
characteristics
I tried:
rule "Flag missing Foos with values"
when
not(Foo(stringProp=="blah", intProp==5))
then
System.err.println("A proper foo does not exist");
end
I also tried:
rule "Flag missing Foos with values"
when
not(exists(Foo(stringProp=="blah", intProp==5)))
then
System.err.println("A proper foo does not exist");
end