[rules-users] Re: Pattern matching
I got it working by using the inline eval expression. The following is the
modified version of the rules.
rule "Remove smaller or non-overriden"
dialect "java"
when
L : Response( $r : value && status != "override" )
Response( value > $r || eval (status.equals("override")) )
then
System.out.println("Retracting " + L);
retract( L );
end
The Response class has two fields one is value and the other is status. For
convenience, I added a constructor where the first parameter is the value and
the second is the status. I have added the following objects into the working
memory for testing.
final Response response1 = new Response(5,"override");
final Response response2 = new Response(6,"not override");
final Response response3 = new Response(7,"not override");
final Response response4 = new Response(8,"not override");
session.insert( response1 );
session.insert( response2 );
session.insert( response3 );
session.insert( response4 );
session.fireAllRules();
The result shows that the object, Response(5,"override"), is the only one left
after the all activated rules have been evaluated.
I am not sure why "==" does not work in this example. Is this a known bug?