Re: [rules-dev] [rules-users] Trying to compare variables of two objects, not working. (compiles, but not desired result)
5.3.0 and 5.4.0.Beta2: Comparing int and Integer fails unless the
traditional (up to 5.1.1) "return value" construct - parentheses
around the expression - is used:
lineItemId == ($lineItem.getID()) // OK
lineItemId == ($id) // OK with $id bound as LineItem( $id: ID > 0 )
This would work if ID were public:
lineItemId == ($lineItem.ID)
It's best to stay as close as possible to the Java Beans conventions.
Using an upper case initial in field names wasn't accepted by the
Drools compiler prior to 5.3.0.
On 12/04/2012, Vincent LEGENDRE <vincent.legendre(a)eurodecision.com> wrote:
Or may be something more basic : drools does not 'interpret'
Integer types
as int, so == is testing object references ...
This explanation explain why it compiles but not working, whereas if my
previous ideas are right, it should raise a compilation error ...
Try using 'int', or use Integer.valueOf(1) (that will return a shared
instance of Integer).
But this is still very strange as doing the same test in java works (Integer
is treated as a int, and == is testing values ...)
----- Mail original -----
De: "Vincent LEGENDRE" <vincent.legendre(a)eurodecision.com>
À: "Rules Users List" <rules-users(a)lists.jboss.org>
Envoyé: Jeudi 12 Avril 2012 20:44:41
Objet: Re: [rules-users] Trying to compare variables of two objects, not
working. (compiles, but not desired result)
I think (not sure) that the problem comes from the right part of your test :
$lineItem.ID
Try with $lineItem.getID(), or use 'dialect "mvel"' as rule property
You can also bind the id in LineItem and test it in the next pattern :
rule "Test"
when
$lineItem : LineItem( $lineID : ID > 0 )
$trans : TransactionItem( ID > 0, AccountName != null, LineItemID ==
$lineID)
$amount : AccountingItem( TransactionID > 0, CalculatedCommission >
0.0 )
then
System.out.println( $amount.getCalculatedCommission() + " " +
$lineItem.getID() );
end
But this is very strange. To me it should work ...
What is not usual too is your use of "_" before member attributes (let me
guess, you did a lot of C++ ?), which is not the java POJO standards. And
may be that drools relies on fields names too ...
And inside your tests, instead of "LineItemID" you should use
"lineItemID"
(with a lower case letter first, like the name your internal attribute
should have, following the common java conventions).
But if all of this is a problem, the symptom should be a compilation error
.... so it is still strange ...
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