The simple i: Item ( f memberOf (makeA()) ) should do. -W On 23/01/2013, Marco Malziotti <marco.malziotti(a)trs.it&gt; wrote: > Hello > I am a beginner in Drools 5.1.1 and try to use 'memberOf' operator. > Simply I want check whether a short field 'f' (belonging to Item > class) > is a member of an array 'a': retrieved by a function 'makeA'. > In my .drl file I try with : > > function Short[] makeA() { > return (new Short[] {1, 2, 3} ); > } > > rule "chek" > when > a: Short[]() from makeA() > i: Item ( f memberOf a ) > then > ... 'f' is member of array 'a' ! > end > > I have following stack trace: > java.lang.ClassCastException: Can't check if an attribute is member > of > an object of class class java.lang.Short > at > > org.drools.base.evaluators.SetEvaluatorsDefinition$BaseMemberOfEvaluator.evaluateCachedRight(SetEvaluatorsDefinition.java:532) > at > > org.drools.rule.VariableRestriction.isAllowedCachedRight(VariableRestriction.java:117) > at > > org.drools.rule.VariableConstraint.isAllowedCachedRight(VariableConstraint.java:121) > at > > org.drools.common.SingleBetaConstraints.isAllowedCachedRight(SingleBetaConstraints.java:151) > at org.drools.reteoo.JoinNode.assertObject(JoinNode.java:125) > at > > org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:59) > at > > org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:190) > at > > org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:145) > at > > org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1174) > at > > org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1123) > at > > org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:917) > at > > org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:251) > > In : > > http://lists.jboss.org/pipermail/rules-users/2008-October/006746.html > and > > http://lists.jboss.org/pipermail/rules-users/2007-September/003010.html > I haven't found the solution to my problem. > > I don't know if it is already open a related issue. > > Thanks for your attention. > Regards. > > Marco Malziotti > Tecnologie nelle Reti e nei Sistemi T.R.S. S.p.A. > Integration Test Engineer > Tel. + 39 06.87281.407 > Fax. + 39 06.87281.550 > E-mail: marco.malziotti(a)trs.it > > > Tecnologie nelle Reti e nei Sistemi T.R.S. SpA > Via della Bufalotta, 378 - 00139 Roma > Tel +39.06.87.28.1.1 - Fax +39.06.87.28.1.550 > > ------------------------------------------------------- > > Ai sensi del D.Lgs. 196/2003 si precisa che le informazioni > contenute in > questo messaggio > sono riservate ed a uso esclusivo del destinatario. Qualora il > messaggio in > parola Le > fosse pervenuto per errore, la preghiamo di eliminarlo senza > copiarlo e di > non inoltrarlo > a terzi, dandocene gentilmente comunicazione. Grazie. > This message, for the law 196/2003, may contain confidential and/or > privileged information. > If you are not the addressee or authorized to receive this for the > addressee, you must not > use, copy, disclose or take any action based on this message or any > information herein. > If you have received this message in error, please advise the sender > immediately by reply > e-mail and delete this message. Thank you for your cooperation. > > ------------------------------------------------------- > > This message has been scanned for viruses and dangerous content by > MailScanner, and is believed to be clean. > > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

A better approach for your use case would be to use additional facts: declare Cont name: String objects: Collection end rule "define Cont(s)" salience 999999999 when then insert( new Cont( "A", setOf(1, 2, 3) ) ); end Cont( name == "A", $coll ) i: Item ( f memberOf $coll ) -W On 24/01/2013, Marco Malziotti <marco.malziotti(a)trs.it&gt; wrote: > Thanks Wolfgang > In addition to using 'memberOf' operator, there is a way to retain in > RHS result from makeA(), without calling one more time makeA() function > ? > In consequence (then) of my example I want print 'a' that already holds > (?) the function result. > Once again thanks. > > Marco > > On Wed, 23 Jan 2013 17:49:04 +0100, Wolfgang Laun wrote: >> The simple >> i: Item ( f memberOf (makeA()) ) >> should do. >> -W >> >> On 23/01/2013, Marco Malziotti <marco.malziotti(a)trs.it&gt; wrote: >>> Hello >>> I am a beginner in Drools 5.1.1 and try to use 'memberOf' operator. >>> Simply I want check whether a short field 'f' (belonging to Item >>> class) >>> is a member of an array 'a': retrieved by a function 'makeA'. >>> In my .drl file I try with : >>> >>> function Short[] makeA() { >>> return (new Short[] {1, 2, 3} ); >>> } >>> >>> rule "chek" >>> when >>> a: Short[]() from makeA() >>> i: Item ( f memberOf a ) >>> then >>> ... 'f' is member of array 'a' ! >>> end >>> >>> I have following stack trace: >>> java.lang.ClassCastException: Can't check if an attribute is member >>> of >>> an object of class class java.lang.Short >>> at >>> >>> org.drools.base.evaluators.SetEvaluatorsDefinition$BaseMemberOfEvaluator.evaluateCachedRight(SetEvaluatorsDefinition.java:532) >>> at >>> >>> org.drools.rule.VariableRestriction.isAllowedCachedRight(VariableRestriction.java:117) >>> at >>> >>> org.drools.rule.VariableConstraint.isAllowedCachedRight(VariableConstraint.java:121) >>> at >>> >>> org.drools.common.SingleBetaConstraints.isAllowedCachedRight(SingleBetaConstraints.java:151) >>> at org.drools.reteoo.JoinNode.assertObject(JoinNode.java:125) >>> at >>> >>> org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:59) >>> at >>> >>> org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:190) >>> at >>> >>> org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:145) >>> at >>> >>> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1174) >>> at >>> >>> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1123) >>> at >>> >>> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:917) >>> at >>> >>> org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:251) >>> >>> In : >>> >>> http://lists.jboss.org/pipermail/rules-users/2008-October/006746.html >>> and >>> >>> http://lists.jboss.org/pipermail/rules-users/2007-September/003010.html >>> I haven't found the solution to my problem. >>> >>> I don't know if it is already open a related issue. >>> >>> Thanks for your attention. >>> Regards. >>> >>> Marco Malziotti >>> Tecnologie nelle Reti e nei Sistemi T.R.S. S.p.A. >>> Integration Test Engineer >>> Tel. + 39 06.87281.407 >>> Fax. + 39 06.87281.550 >>> E-mail: marco.malziotti(a)trs.it >>> >>> >>> Tecnologie nelle Reti e nei Sistemi T.R.S. SpA >>> Via della Bufalotta, 378 - 00139 Roma >>> Tel +39.06.87.28.1.1 - Fax +39.06.87.28.1.550 >>> >>> ------------------------------------------------------- >>> >>> Ai sensi del D.Lgs. 196/2003 si precisa che le informazioni >>> contenute in >>> questo messaggio >>> sono riservate ed a uso esclusivo del destinatario. Qualora il >>> messaggio in >>> parola Le >>> fosse pervenuto per errore, la preghiamo di eliminarlo senza >>> copiarlo e di >>> non inoltrarlo >>> a terzi, dandocene gentilmente comunicazione. Grazie. >>> This message, for the law 196/2003, may contain confidential and/or >>> privileged information. >>> If you are not the addressee or authorized to receive this for the >>> addressee, you must not >>> use, copy, disclose or take any action based on this message or any >>> information herein. >>> If you have received this message in error, please advise the sender >>> immediately by reply >>> e-mail and delete this message. Thank you for your cooperation. >>> >>> ------------------------------------------------------- >>> >>> This message has been scanned for viruses and dangerous content by >>> MailScanner, and is believed to be clean. >>> >>> >>> _______________________________________________ >>> rules-users mailing list >>> rules-users(a)lists.jboss.org >>> https://lists.jboss.org/mailman/listinfo/rules-users >>> >> _______________________________________________ >> rules-users mailing list >> rules-users(a)lists.jboss.org >> https://lists.jboss.org/mailman/listinfo/rules-users > > > Tecnologie nelle Reti e nei Sistemi T.R.S. SpA > Via della Bufalotta, 378 - 00139 Roma > Tel +39.06.87.28.1.1 - Fax +39.06.87.28.1.550 > > ------------------------------------------------------- > > Ai sensi del D.Lgs. 196/2003 si precisa che le informazioni contenute in > questo messaggio > sono riservate ed a uso esclusivo del destinatario. Qualora il messaggio > in > parola Le > fosse pervenuto per errore, la preghiamo di eliminarlo senza copiarlo e > di > non inoltrarlo > a terzi, dandocene gentilmente comunicazione. Grazie. > This message, for the law 196/2003, may contain confidential and/or > privileged information. > If you are not the addressee or authorized to receive this for the > addressee, you must not > use, copy, disclose or take any action based on this message or any > information herein. > If you have received this message in error, please advise the sender > immediately by reply > e-mail and delete this message. Thank you for your cooperation. > > ------------------------------------------------------- > > This message has been scanned for viruses and dangerous content by > MailScanner, and is believed to be clean. > > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users >