[rules-users] accumulate / sum and ArrayList

[Gerald Cantor]

Edson,
Works like a champ. Thank you so much for you quick response.

Regards,
Gerald

----- Original Message ----
From: Edson Tirelli <tirelli at post.com>
To: Rules Users List <rules-users at lists.jboss.org>
Sent: Thursday, March 13, 2008 7:17:14 PM
Subject: Re: [rules-users] accumulate / sum and ArrayList


   Gerald, 

   It is not clear if you want to calculate the sum of all integers in the original list or the sum of all integers greater than 0.
   Assuming you want to sum all integers greater than 0, see example bellow. Adjust the example to your needs if you want something different. 
   
   You already know how to access the elements of a list:

Number( intValue > 0 ) from $mo.getNumbers()

   You already know how to collect them:

$i : ArrayList ( ) from collect ( Number( intValue > 0 ) from $mo.getNumbers() )

   If instead of collecting them, you want to "accumulate" them:

$total : Number() from accumulate( $n:Number( intValue > 0 ) from $mo.getNumbers(),
                                                   sum( $n ) )

  Hope it helps,
      Edson 






2008/3/13, Gerald Cantor <geraldmcantor at yahoo.com>:
 I have an Object in working memory. This object has an ArrayList of Integer
 objects. I am trying to create a rule that will count all occurrences of
 Integers in this ArrayList that are non-zero and then calculate the sum of
 all the Integers in the ArrayList and then check the total against a range.
 
 I understand how to count the non-zero occurrences but I am at a complete
 loss as to how to calculate the sum of the Integer objects in the ArrayList.
 
 Here is the rule I have thus far
 rule "Rule 1"
        dialect "java"
        when
                $mo : MyObject( )
                $i : ArrayList ( ) from collect ( Number( intValue > 0 ) from
 $mo.getNumbers() )
                $total : Number(  ) from accumulate ???
        then
                System.out.println("Rule 1: i.size() = " + $i.size());
                System.out.println("Rule 1: total = " + $total);
 end
 
 I have been unsuccessful in finding a post that deals with how to fill in
 the ??? portion of my rule. My apologies in advance if I happen to miss such
 a post.
 
 Any help is greatly appreciated.
 
 Regards,
 Gerald
 
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-- 
  Edson Tirelli
  JBoss Drools Core Development
  Office: +55 11 3529-6000
  Mobile: +55 11 9287-5646
  JBoss, a division of Red Hat @ www.jboss.com

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