[rules-users] Nested properties and memberOf
Meeraj Kunnumpurath
mkunnumpurath at googlemail.com
Fri Jul 16 10:56:15 EDT 2010
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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