[rules-users] Filter incorrect abbreviations

[Pete Crenshaw]

Hello Edson,

thank you for your support.

Your suggestions work very well.

In my case the "Compound Value Restriction" is exactly what I was looking
for.

This is the way I will use it in my domain:

a : Abbreviation( pos1 == 'A' && ( pos2 not in ('-','D','H') || pos3 != '-'
|| pos4 not in ('O', 'R', 'U', 'L')) )

Thank you very much.

Cheers Pete

On Tue, Jul 29, 2008 at 5:15 PM, Edson Tirelli <tirelli at post.com> wrote:

>
>    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 at 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
>>
>> _______________________________________________
>> rules-users mailing list
>> rules-users at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>>
>
>
> --
> Edson Tirelli
> JBoss Drools Core Development
> JBoss, a division of Red Hat @ www.jboss.com
>
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>
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