[rules-users] Nested properties and memberOf

[Meeraj Kunnumpurath]

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
>>
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>>
>>
>
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