Re: [rules-users] Re: About for and inheritance

Yes, drools is deferring the type verification until it is needed (in your example, to check the constraint). May I ask you please to open a JIRA... I will fix that. []s Edson 2007/9/27, Chris Woodrow <woodrow.chris(a)gmail.com&gt;: > I am sorry I didn't mean 'for' but 'from'. > :D > > 2007/9/27, Chris Woodrow < woodrow.chris(a)gmail.com&gt;: > > > > Hi, > > I recently find out a few issues using for, and I wanted to share it > > with you. I made a simple exemple to illustrate my purpose. > > > > My classes are (I did not represent accessors & constructors): > > > > public class Cheese { > > protected String name; > > } > > > > public class FrenchCheese extends Cheese{ > > private String smell; > > } > > > > public class Person { > > private Cheese likes; > > } > > > > Here is my rule set : > > > > package rules > > > > rule "likes cheese" > > when > > $person : Person () > > Cheese( ) from $person.getLikes() > > then > > System.out.println ("likes cheese"); > > end > > > > > > rule "likes french cheese" > > when > > $person : Person () > > FrenchCheese( ) from $person.getLikes() > > then > > System.out.println ("likes french cheese"); > > end > > > > First test : > > Cheese cheese = new FrenchCheese("good", "camembert"); > > Person person = new Person(); > > person.setLikes(cheese); > > > > Output : > > likes french cheese > > likes cheese > > > > Wich is expected... > > > > Second test : > > Cheese cheese = new Cheese(); > > Person person = new Person(); > > person.setLikes(cheese); > > > > Output : > > likes french cheese > > likes cheese > > > > That's the first strange thing. As far as I am concerned, rule "likes > > french cheese" should not match (since a Cheese is not a FrenchCheese). > > > > I made a change to the second rule : > > rule "likes french cheese" > > when > > $person : Person () > > FrenchCheese( smell == "good" ) from $person.getLikes() > > then > > System.out.println("likes french cheese"); > > end > > > > Third test : > > Cheese cheese = new Cheese(); > > Person person = new Person(); > > person.setLikes(cheese); > > > > output : > > It throwed an exception : Exception in thread "main" > > java.lang.ClassCastException: rules.Cheese > > I am not saying the ClassCastException is not to expect in such a case > > but I think I would simply expect it not to match (as far as a Cheese is not > > a FrenchCheese). > > > > Chris > > > > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > -- Edson Tirelli Software Engineer - JBoss Rules Core Developer Office: +55 11 3529-6000 Mobile: +55 11 9287-5646 JBoss, a division of Red Hat @ www.jboss.com _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users