Hey Mike ... I am sorry to bother you but you seemed to be pretty good with rules and i just could not think of anyone else to ask abt it ... I am sorry if i am taking much of your time .. Here is my problem if you can have a quick look ..

Look at this code once .. its very easy but it involves tons of if else blocks conditions ..

                if( newItem.getItemStatusCode() == null){
                        //do something
                }
                else{
                        if( !valDao.isValidItemStatus(newItem.getItemStatusCode(),user) ){
                        //do something
                        }
                        if( newItem.getItemStatusCode().equals(ItemVo.DELETED)||getItemStatusCode().equals(ItemVo.INACTIVE) ){

                                if( valDao.isCrossReferencePrime(newItem.getItemNbr(),user)){
                                        //do something
                                }
                                else if( valDao.isFutrCrossReferencePrimeOrSecond(newItem.getItemNbr(),user) ){
                                        //do something
                                }
                                else if( valDao.isComponentLink(newItem.getItemNbr(),user)){
                                        //do something
                                }
                                else if( valDao.hasWhseOnHandsOrOnOrders(newItem.getItemNbr(),user)&&CountryCode().equals("CA") ){

                                //do something
                                }
                        }
                        else{
                                if( valDao.isUnlikeAsstParentWithNonActiveChildren(newItemNbr,user) ){
                                //do something;
                                }else if (isLikeAssortmentBaby(newItemNbr,user)&&!alDao.isLikeAsstParentActive(newItemNbr, user)){

                                                //do something                                 
                                }else{
                                                //do something
                                        }
                                }
                        }
                }

What i am trying to understand is the right way of putting it in drl files ..
1.What are the options for putting if else conditions ? Will i have to write all the rules anyway and they will be called as well all the time depending on the criteria ... or is there a way where when my first if check which was if item number is null failed i should not go for any other rules .. Is there a way where we could have like "when" inside "when" .. kinda looping of conditions so if one does not meet you dont go to the next .. jsut like in above blocks ? Whats the good way of doing it ?

2.Is it possible to make database calls like from my dao instance in LHS (condition) .. i know we can do it in RHS and i have tested that as well but can we do it in LHS as sometimes we need to do that ..like with null checks for the item status code we also want to check something from the database like a boolean value and if that meets the criteria we will run the rules ..as u can see above we have basic state check with nulls etc plus we have some dao calls as well in the condition part and then we //do something

3.Can i call rules within other rules .. so something like in rule1 i want to call rule2 .. is that possible ?

Can you suggest a decent way of doing these if else blocks .. this is the core stuff which we do for our rules here .. if i can handle this kind of conditions i guess i can handle anything out here ...

Thanks for all the help ..

Sanjay

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