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

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