[rules-users] Nested properties and memberOf

[David Sinclair]

Ah, sorry, didn't realize that syntax wasn't supported in Drools. That being
said, your rules may not fire in the order they are defined. (I forget what
the default behavior as far as which rule would be activated first if all
conditions were satisfied).

What exactly are you trying to accomplish? It may be easier to write rules
if you assert more of your object model into WM as opposed to the deep
nesting. You'll also get performance improvements by doing so.

dave

2010/7/16 Meeraj Kunnumpurath <mkunnumpurath at googlemail.com>

> Hi Dave,
>
> I tried the null-safe navigation as below,
>
> rule "Check debtor account number exists"
>     salience 1
> when
>     $c : CreditTransferTransactionInformation10(dbtrAcct.?id.?othr.?id not
> memberOf accountNumbers)
>     eval(!accountNumbers.contains($accountNumber))
> then
>     System.err.println($c.getInternalInfo().getStatus());
>     System.err.println("Rule 2 executed");
> end
>
> I get the error
>
> [29,57]: [ERR 102] Line 29:57 mismatched input '?' expecting 'identifier'
> in rule "Check debtor account number exists" in pattern
> CreditTransferTransactionInformation10
> [29,61]: [ERR 102] Line 29:61 mismatched input '?' expecting 'identifier'
> in rule "Check debtor account number exists" in pattern
> CreditTransferTransactionInformation10
> [29,67]: [ERR 102] Line 29:67 mismatched input '?' expecting 'identifier'
> in rule "Check debtor account number exists" in pattern
> CreditTransferTransactionInformation10
>
> Thanks
> Meeraj
>
> On Fri, Jul 16, 2010 at 5:04 PM, Meeraj Kunnumpurath <
> mkunnumpurath at googlemail.com> wrote:
>
>> Thanks Dave.
>>
>> I think the '||' on rule 1 is getting short-circuited. However, it is the
>> '&&' on rule 2 that is not getting short circuited.
>>
>> Kind regards
>> Meeraj
>>
>> 2010/7/16 David Sinclair <dsinclair at chariotsolutions.com>
>>
>> Drools doesn't use short circuit evaluation, so all of those ORs are going
>>> to be evaluated. You may want to consider re-writing your rules or you can
>>> use MVEL's null safe navigation for this. dbtrAcct.?id == null,
>>> dbtrAcct.?id.?othr == nulll, etc.
>>>
>>> dave
>>>
>>>
>>>
>>> 2010/7/16 Meeraj Kunnumpurath <mkunnumpurath at googlemail.com>
>>>
>>>>  Hi,
>>>>
>>>> I have the following rules,
>>>>
>>>> global java.util.Set accountNumbers;
>>>>
>>>> rule "rule 1"
>>>> when
>>>>     $d : Document()
>>>>     $c : CreditTransferTransactionInformation (dbtrAcct == null ||
>>>> dbtrAcct.id == null || dbtrAcct.id.othr == null || dbtrAcct.id.othr.id== null) from $d.cstmrCdtTrfInitn.cdtTrfTxInf
>>>>     $i : InternalInfo() from $c.internalInfo
>>>> then
>>>>     $i.setStatus(PaymentStatus.INVALID);
>>>>     $i.setErrorCode("PR002");
>>>>     $i.setAdditionalInfo("Account number is null");
>>>> end
>>>>
>>>> rule "rule 2"
>>>> when
>>>>     $d : Document()
>>>>     $c : CreditTransferTransactionInformation(internalInfo.status !=
>>>> PaymentStatus.INVALID && dbtrAcct.id.othr.id not memberOf
>>>> accountNumbers) from $d.cstmrCdtTrfInitn.cdtTrfTxInf
>>>>     $i : InternalInfo() from $c.internalInfo
>>>> then
>>>>     $i.setStatus(PaymentStatus.INVALID);
>>>>     $i.setErrorCode("PR002");
>>>>     $i.setAdditionalInfo("Account number not available in the routing
>>>> table");
>>>> end
>>>>
>>>> My assumption is rule 1 and rule 2 will be executed in the order they
>>>> appear. Rule 1 checks all the nested attributes are not null and set the
>>>> status as invalid if any of them is null. Rule 2 uses the and operator and
>>>> checks the nested attribute is in the collection defined by the global, only
>>>> if the object is valid. I assume the LHS of rule 2 will be short circuited
>>>> if the object is invalid. However, if any of the nested property is null I
>>>> get the following exception from MVEL.
>>>>
>>>> Caused by: [Error: unable to access property (null parent): id]
>>>> [Near : {... Unknown ....}]
>>>>              ^
>>>> [Line: 1, Column: 0]
>>>>     at
>>>> org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:861)
>>>>
>>>> Regards
>>>> Meeraj
>>>>
>>>> _______________________________________________
>>>> rules-users mailing list
>>>> rules-users at lists.jboss.org
>>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>>
>>>>
>>>
>>> _______________________________________________
>>> rules-users mailing list
>>> rules-users at lists.jboss.org
>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>
>>>
>>
>
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.jboss.org/pipermail/rules-users/attachments/20100716/dcb4f63d/attachment.html