[rules-users] accumulate / sum and ArrayList

[Gerald Cantor]

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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