[rules-users] Re: DSL field constraint question

[Andy Mei]

Any idea?

I really appreciate any help or pointers!

Andy

On 8/31/07, Andy Mei <andy.d.mei at gmail.com> wrote:
>
> Hi,
>
>   I am new to Drools and working with 4.0.1 version.
>   I am playing with DSL and having trouble with conditional field
> constraints.
>   I really appreciate any help, i like drools a lot and would love to use
> it.
>
>   Here is the simple rule i have:
>
> rule "Credit Approved"
>     salience 5
>     when
>         //notice here we are using our own domain specific language that's
> defined within
>         #credit.dsl file
>         There is a person with
>             #-must has a name
>             -age is at least 18 years old
>     then
> >        System.out.println( "[ALLOW] Credit approved for " +
> person.getName());
> end
>
>   Here is my dsl definition:
> [when]There is a person with=person:Person()
> [when]-age is at least {age} years old=(age >= {age})
> [when]-age is less than {age} years old=(age < {age})
> [when]-must has a name=(name != "" && name != null)
> [when]-id must be positive integer=id > 0
>
> Everything works fine if i use only 'age is least 18 years old' or 'must
> has a name'.
> However, if i try to do a connective and between these two constraints, i
> am getting
>  package build errors:
> Package build error found:
> [13,43]: unknown:13:43 mismatched token: [@59,331:331=',',<11>,13:43];
> expecting type RIGHT_PAREN[13,59]: unknown:13:59 mismatched token:
> [@71,347:347=')',<12>,13:59]; expecting type THEN
> Exception in thread "main" org.drools.rule.InvalidRulePackage: [13,43]:
> unknown:13:43 mismatched token: [@59,331:331=',',<11>,13:43]; expecting type
> RIGHT_PAREN[13,59]: unknown:13:59 mismatched token:
> [@71,347:347=')',<12>,13:59]; expecting type THEN
>     at org.drools.rule.Package.checkValidity(Package.java:419)
>     at org.drools.common.AbstractRuleBase.addPackage (
> AbstractRuleBase.java:292)
>     at com.trg.play.rules.PersonTest.readRule(PersonTest.java:103)
>     at com.trg.play.rules.PersonTest.main(PersonTest.java:51)
>
> I have attached my test program for your review.
>
>
>
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