What's the rules around declared types extending another (declared) type? I've been asked to provide for declared type extension in Guvnor (by Prakash) but the Expert user-guide doesn't say it exists at the engine level. I tried "declare MyType extends java.util.ArrayList" and received a parser\compiler error stating "java.util.ArrayList was not a declared type" (or words to that effect) so some form of extension appears possible. Thanks, Mike _______________________________________________ rules-dev mailing list rules-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-dev

There's also a quirk regarding the class resolution:- Given Person class:- package com.guvnor.domain; import java.math.BigDecimal; public class Person { private BigDecimal salary; public BigDecimal getSalary() { return salary; } public void setSalary(BigDecimal salary) { this.salary = salary; } } The following compiles OK:- package com.sample import com.guvnor.domain.Person declare Person end However the following does not (without explicitly importing java.math.BigDecimal - which is a field type in Person):- package com.sample import com.guvnor.domain.Person import com.guvnor.domain.Address declare Person end declare Person2 extends Person flange : String end Error being "Unknown DroolsError class org.drools.compiler.TypeDeclarationError: Unable to find class 'BigDecimal' ". With kind regards, Mike On 11 July 2011 08:41, Wolfgang Laun <wolfgang.laun(a)gmail.com&gt; wrote: > Subsection 5.7.7 discusses 'extends' and describes how it is done for > types declared in Java. > > One finesse is apparently not documented: Java types must be proper > JavaBeans; otherwise the construction of the accessors will fail. (Try, for > instance, a property with a getter but no matching setter.) > > HTH > -W > > > On 10 July 2011 22:29, Michael Anstis <michael.anstis(a)gmail.com&gt; wrote: > >> What's the rules around declared types extending another (declared) type? >> >> I've been asked to provide for declared type extension in Guvnor (by >> Prakash) but the Expert user-guide doesn't say it exists at the engine >> level. >> >> I tried "declare MyType extends java.util.ArrayList" and received a >> parser\compiler error stating "java.util.ArrayList was not a declared type" >> (or words to that effect) so some form of extension appears possible. >> >> Thanks, >> >> Mike >> >> _______________________________________________ >> rules-dev mailing list >> rules-dev(a)lists.jboss.org >> https://lists.jboss.org/mailman/listinfo/rules-dev >> >> > > _______________________________________________ > rules-dev mailing list > rules-dev(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-dev > >

Wolfgang, still no news as to the expected behaviour :( Sotty, I appreciate you are probably busy with other activities, however any your thoughts on the following would be most welcome:- - For POJOs is a field only added to the declared type if it has a getter and setter (something laune said he'd seen; email earlier in this thread)? - Are fact-level annotations inherited? - Are field-level annotations inherited? - Type erasure on subclasses, if type A declares "myVar : String" and type B extends A and declaring "myVar : Integer", what should happen? For others interested, here's some answers already received: - Can declarative types extend Java POJOs and other declared types? <sotty> yes - For POJO's do I need to include an "empty" declaration? So "declare java.util.ArrayList end" if I want to "declare MyList extends ArrayList" in a java.util package? <sotty> no, it should be enough to import the fqn or use it in the "extends". *<manstis> note this is different to what is documented in the Drools Expert user-guide * Thanks, Mike On 12 July 2011 13:12, Michael Anstis <michael.anstis(a)gmail.com&gt; wrote: > https://issues.jboss.org/browse/JBRULES-3133 created. > > > On 12 July 2011 13:08, Michael Anstis <michael.anstis(a)gmail.com&gt; wrote: > >> There's also a quirk regarding the class resolution:- >> >> Given Person class:- >> >> package com.guvnor.domain; >> >> import java.math.BigDecimal; >> >> public class Person { >> >> private BigDecimal salary; >> >> public BigDecimal getSalary() { >> return salary; >> } >> >> public void setSalary(BigDecimal salary) { >> this.salary = salary; >> } >> >> } >> >> >> The following compiles OK:- >> >> package com.sample >> >> import com.guvnor.domain.Person >> >> declare Person >> end >> >> However the following does not (without explicitly importing >> java.math.BigDecimal - which is a field type in Person):- >> >> package com.sample >> >> import com.guvnor.domain.Person >> import com.guvnor.domain.Address >> >> declare Person >> end >> >> declare Person2 extends Person >> flange : String >> end >> >> Error being "Unknown DroolsError class >> org.drools.compiler.TypeDeclarationError: Unable to find class 'BigDecimal' >> ". >> >> With kind regards, >> >> Mike >> >> >> On 11 July 2011 08:41, Wolfgang Laun <wolfgang.laun(a)gmail.com&gt; wrote: >> >>> Subsection 5.7.7 discusses 'extends' and describes how it is done for >>> types declared in Java. >>> >>> One finesse is apparently not documented: Java types must be proper >>> JavaBeans; otherwise the construction of the accessors will fail. (Try, for >>> instance, a property with a getter but no matching setter.) >>> >>> HTH >>> -W >>> >>> >>> On 10 July 2011 22:29, Michael Anstis <michael.anstis(a)gmail.com&gt; wrote: >>> >>>> What's the rules around declared types extending another (declared) >>>> type? >>>> >>>> I've been asked to provide for declared type extension in Guvnor (by >>>> Prakash) but the Expert user-guide doesn't say it exists at the engine >>>> level. >>>> >>>> I tried "declare MyType extends java.util.ArrayList" and received a >>>> parser\compiler error stating "java.util.ArrayList was not a declared type" >>>> (or words to that effect) so some form of extension appears possible. >>>> >>>> Thanks, >>>> >>>> Mike >>>> >>>> _______________________________________________ >>>> rules-dev mailing list >>>> rules-dev(a)lists.jboss.org >>>> https://lists.jboss.org/mailman/listinfo/rules-dev >>>> >>>> >>> >>> _______________________________________________ >>> rules-dev mailing list >>> rules-dev(a)lists.jboss.org >>> https://lists.jboss.org/mailman/listinfo/rules-dev >>> >>> >> >