[rules-dev] Why are fundamental API functions not part of "stable"?

[Wolfgang Laun]

Please don't keep telling me to do something that can't be done.

import org.drools.runtime.StatefulKnowledgeSession;
import org.drools.KnowledgeBase;
import org.drools.definition.KnowledgePackage;

	public List<String> getRuleNamesFromPackage( String kPackageName ){
	    List<String> nameList = new ArrayList<String>();
		for( KnowledgePackage knowledgePackage:
session.getKnowledgeBase().getKnowledgePackages() ){
			if( kPackageName == null || kPackageName.equals(
knowledgePackage.getName() ) ){
				for( org.drools.definition.rule.Rule rule: knowledgePackage.getRules() ){
					org.drools.rule.Rule odrRule = (org.drools.rule.Rule)rule;
//<<<<< line 155: try a cast to get rule's agenda
					nameList.add( rule.getName() );
				}
			}
		}
		return nameList;
	}

Exception in thread "main" java.lang.ClassCastException:
org.drools.definitions.rule.impl.RuleImpl cannot be cast to
org.drools.rule.Rule
	at rss.checker.engine.impl.DroolsEngine.getRuleNamesFromPackage(DroolsEngine.java:155)
	at rss.checker.engine.impl.DroolsEngine.getRuleNames(DroolsEngine.java:165)
	at rss.checker.init.Main.exec(Main.java:51)
	at rss.checker.init.Main.main(Main.java:68)


There's lots of rules around that have agenda-group "whatever".  ARE
YOU PLANNING TO ABOLISH THIS????
I ONLY WANT TO GET BACK WHAT I WROTE ACCORDING TO THE CURRENTLY VALID
DOCUMENTATION!!!

-W


On 20 August 2010 20:30, Mark Proctor <mproctor at codehaus.org> wrote:
>  On 20/08/2010 17:21, Wolfgang Laun wrote:
>> Please note that I am and was well aware of org.drools.rule.Rule. But this isn't
>> available from what you get via StatefulKnowledgeSession, KnowledgeBasae,
>> KnowledgePackage. See below.
> I want to compltely change agenda-groups, ruleflow-groups,
> activation-groups etc.
>
> In the same way you'll be reluctant to want to use internal methods as
> they will change over time. I'm reluctant to expose internal things that
> I know I want to change in the near term. We have to support those apis
> for 5 years.
>
> Can you caste for now to try and solve your problem? The information is
> there if you caste to org.drools.rule.Rule. We are working on pushing
> more things out of core and compiler over time as we feel confident in
> exposing those things. But it takes time and we are conservative in
> this, as we want to avoid doing anything that makes future changes hard.
>
> Mark
>> On 20 August 2010 17:46, Mark Proctor<mproctor at codehaus.org>  wrote:
>>>   On 20/08/2010 11:13, Wolfgang Laun wrote:
>>>> StatefulKnowledgeSession session = ...;
>>>> for( KnowledgePackage knowledgePackage:
>>>> session.getKnowledgeBase().getKnowledgePackages() ){
>>>>        for( Rule rule: knowledgePackage.getRules() ){
>>>>             ???
>>>>
>>>> but it turns out that this "rule" object is of the interface type
>>>>      org.drools.definition.rule.Rule
>>>> implemented by
>>>>      org.drools.definitions.rule.impl.Rule
>>>> which is just as meagre as the interface. Dead end, apparently.
>>> You looked at the wrong implementation. Notice that Rule is also
>>> implemented by org.drools.rule.Rule. That one has the meat you need.
>>>
>> This is what I wrote:
>>
>>>> Using other classes like Package or RuleBase from the "unstable" part
>>>> of the API to get at
>>>> the "real meat" in org.drools.rule.Rule isn't really a way I want to go.
>>>>
>> _______________________________________________
>> rules-dev mailing list
>> rules-dev at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-dev
>>
>>
>
>
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