[rules-dev] DRL comilation: Parsing null does not work where parsing an enum literal does works.

[Geoffrey De Smet]

PatternEntryPropertyWildcard is not defined inside Assignement (not as a 
property, not as a subclass).
PatternEntryPropertyWildcard is a class (an enum actually), which is 
imported.

With kind regards,
Geoffrey De Smet


Esteban Aliverti schreef:
> Just guessing, but is PatternEntryPropertyWildcard defined inside 
> Assignment?
> When you write
>    Assignment(null == $shiftType)
>  
> You are writing a Field Constraint over Assignment. So, the first 
> element of the constraint should be a field from Assignment, but you are 
> putting "null". I think that's your error there.
> 
> Best, 
> 
> On Sun, May 30, 2010 at 8:50 AM, Geoffrey De Smet 
> <ge0ffrey.spam at gmail.com <mailto:ge0ffrey.spam at gmail.com>> wrote:
> 
>     This works in DRL:
>       Assignment(
>           (PatternEntryPropertyWildcard.ANY == $shiftTypeWildcard)
>               || (shiftType == $shiftType)
>           ...
>       )
>     But this doesn't work in DRL:
>       Assignment(
>           (null == $shiftType)
>               || (shiftType == $shiftType)
>           ...
>       )
>     It says "no viable alternative at input 'null' in rule"
> 
>     Is there a specific reason why enum literals work on that spot and the
>     null literal doesn't?
> 
> 
>     Here's the full stacktrace:
> 
>     Exception in thread "main" java.lang.IllegalStateException: There are
>     errors in the scoreDrl's:[536,8]: [ERR 101] Line 536:8 no viable
>     alternative at input ')' in rule "unwantedPatternShiftType2DaysPattern"
>     in pattern ShiftType2DaysPattern[542,13]: [ERR 101] Line 542:13 no
>     viable alternative at input 'null' in rule
>     "unwantedPatternShiftType2DaysPattern" in pattern Assignment[544,12]:
>     [ERR 102] Line 544:12 mismatched input '$employee' expecting ')' in rule
>     "unwantedPatternShiftType2DaysPattern" in pattern Assignment[544,32]:
>     [ERR 102] Line 544:32 mismatched input ',' expecting '(' in rule
>     "unwantedPatternShiftType2DaysPattern" in pattern employee[545,8]: [ERR
>     102] Line 545:8 mismatched input ')' expecting '(' in rule
>     "unwantedPatternShiftType2DaysPattern" in pattern employee in pattern
>     shiftDateDayIndex[547,13]: [ERR 101] Line 547:13 no viable alternative
>     at input 'null' in rule "unwantedPatternShiftType2DaysPattern" in
>     pattern employee in pattern Assignment
> 
> 
>     --
>     With kind regards,
>     Geoffrey De Smet
> 
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> 
> 
> 
> 
> -- 
> XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
> 
> Esteban Aliverti
> 
> 
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