If you have each character in a different attribute, you can use "in" and "not in" to list the valid/invalid characters:
a : Abbreviation( pos1 == 'A', pos2 in ('-','D','H'), pos3 == '-', pos4 in ('O', 'R', 'U', 'L') )
a : Abbreviation( pos1 == 'A', pos2 not in ('-','D','H'), pos3 != '-', pos4 not in ('O', 'R', 'U', 'L') )
Also, if you have a String storing the sequence of characters you are using, you can use "matches" and "not matches" with appropriate regexps:
a : Abbreviation( stringRepresentation matches "A[-DH]-[ORUL]" )
a : Abbreviation( stringRepresentation not matches "A[-DH]-[ORUL]" )
Cheers,
Edson
2008/7/28 Pete Crenshaw
<Pete.Crenshaw@gmx.de>
Hello Droolers,
I'm a Drools novice and I'm stuck with a basic rule problem.
In my domain I use a list of abbreviations to describe the conditions of a system.
Before I can check the state of my system I have to verify all applied abbreviations.
The List of abbreviations is not a fixed list it's more like a combination of chars, combined in different ways on fixed positions.
This is a small cutout:
A cutout of possible chars at Position 1: A B C D F H
A cutout of possible chars at Position 2: - A C s n b
A cutout of possible chars at Position 3: - A B E F M
A cutout of possible chars at Position 4: - H L O R U
Now it is allowed to combine the following abbreviations:
(another small cutout)
A--O A--R A--U A--L
BAAO BAAR BAAU BAAL
but it is not allowed to combine this:
AA** B-** (* stands for all possible chars on a position)
Now I have 2 basic Questions:
1) How can I pick abbreviations that are NOT allowed?
I think it's easy to say:
rule "Rule 1"
when
a : Abbreviation( pos1 == 'A', pos2 == '-', pos3 == '-', pos4 == 'O' )
then
# do something positiv
end
But how can I pick up all the wrong combinations without hardcoding them?
This would end up in a never-ending story.
2) Upgrading the "Rule 1" from my 1st Question I'm looking for a way to make the
Rules more generic.
I don't want to hardcode all possible abbreviation combinations.
How can I realise something like this VERY INFORMAL notation:
rule "Rule 2"
when
a : Abbreviation( pos1 == 'A', pos2 == ['-','D','H'], pos3 == '-', pos4 == ['O', 'R', 'U', 'L'] )
# If abbreviation looks like A--O, AD-O, AD-U, AH-R, etc. everything is fine.
# It's time for "Rule 2" to do something positiv
then
# do something positiv
end
"Rule 2" should find all the abbreviations that are build up according to a set of allowed char combinations.
OR
rule "Rule 3"
when
a : Abbreviation( pos1 == 'A', pos2 != ['-','D','H'], pos3 != '-', pos4 != ['O', 'R', 'U', 'L'] )
# If abbreviation looks like AA-O, AB-U, A-AO, A--K, etc. something is wrong.
# It's time for "RULE 3" to announce something negative
then
# announce something negative
end
"Rule 3" should filter all the abbreviations that are violating a set of allowed char combinations.
Thanx 2 all droolers in advance.
Pete
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Edson Tirelli
JBoss Drools Core Development
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