Re: [rules-users] Clarification of using collections as facts

I'm going through the Drools documentation regarding the use of lists and other collections. I want to make sure my understanding is correct. So if I have a class: public class Foo { private int x; private int y; private List<String> names = ArrayList<String>(); public List<String> getNames() {return names;} // appropriate getters/setters for the int fields ... } With this I can insert a Foo object into working memory. I can even make the int fields dynamic facts with the appropriate addition of "bean-ifying" code. For the List, however, I need to insert it separately into working memory in order to make use of Drools' rule language ('contains' ,etc.)? I'm assuming that doesn't come free because I have to insert my own custom class objects if they are included via composition in a larger fact! Also, I'm guessing the Collection type classes cannot be dynamic facts? Meaning if I modify my List with add, remove, clear, etc., I must explicitly call update in my code on the List fact in order to alert Drools to a change in the List, correct? So then the question also comes up as to how I would write a rule that looks for all instances of Strings in the List that match against a given regex expression. I've not been successful at figuring this out... Rule "when a Foo List is modified, get all Strings in it that start with 'error'" when $foo : Foo($names : names) $foundThese : ArrayList() from collect(??? matches "error.*" from $names) then // act on $foo and $foundThese I know that rule is NOT correct, but I'm not sure how I'm supposed to access an immutable object inside a collection. The examples in the documentation show how to get at mutable class objects. Thanks! -Allen _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users