Mark Proctor wrote:
Femke De Backere wrote:
Another question ;),
Can I perform a cast in MVEL? eg. Patient((ShortSedation)
sedation.sedation24 == *false*)
the LHS "when" is not MVEL, it's DRL Pattern language, it's just that
some things we translate to MVEL for execution. Our pattner language
does not support casting, no. However MVEL itself does support
casting, and you can do that on a RHS "then" which is full MVEL.
Sorry that's not quite true, if you use an EVAL thats pure MVEL a cast
should work inside of that, as evals are like black boxes to the rule
engine and they are executed directly by java or mvel depending on the
dialect you chose.
Mark
Mark
Thx
Op 17-mrt-09, om 19:27 heeft Edson Tirelli het volgende geschreven:
Although Drools makes extensive usage of MVEL, it is always
embedded in the DRL language. So, it is Drools that defines that a
field constraint is always a field accessor in the left with one or
more restrictions in the right.
We need to find a way to make the Drools x MVEL relationship more
clear because it is not the first time this slight confusion is made.
Anyway, docs are being updated, but take a look at the Pattern
documentation (item 7.8.2.1):
https://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/trunk/target/docs/drools-expert/html/ch07.html#RuleLanguage-ConditionalElements
[]s
Edson
2009/3/17 Femke De Backere <[email protected]
<mailto:[email protected]>>
Thx!
Do you know where I could find a tutorial of MVEL in Drools,
because I looked at some MVEL tutorials yesterday and I didn't
find the solution...
2009/3/17 Edson Tirelli <[email protected]
<mailto:[email protected]>>
Left side of a constraint should always be a field
name... no expression allowed. Either move the expression to
the right side or use eval.
Patient( sedation.ultiva > ( 0.1 - 0.02 ) )
Or even better:
Patient(sedation.ultiva > 0.08)
[]s
Edson
2009/3/16 Femke De Backere <[email protected]
<mailto:[email protected]>>
Hi,
The following expression keeps returning the
error [112,32]: [ERR 103] Line 112:32 no viable
alternative at input '+' in rule
"RuleFlow-Split-masterproef.ruleflows.shortsedation-18-22"
in pattern Patient:
Patient(sedation.ultiva+0.02 > 0.1)
with sedation.ultiva returning a double
What am I doing wrong?
Thx,
Femke
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Edson Tirelli
JBoss Drools Core Development
JBoss, a division of Red Hat @ www.jboss.com
<http://www.jboss.com>
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--
Edson Tirelli
JBoss Drools Core Development
JBoss, a division of Red Hat @ www.jboss.com <http://www.jboss.com>
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