Re: [rules-users] Accessing items in a list
On 10/12/2013, mkhan <mushtaq.khan(a)alstom.com> wrote:
Hi,
I am new to doorls so please can you help me.
I am trying to access an ietm from a list in a rule like ...
$data: List(this != null, size > 9) from accumulate(
$obj1 : FwVehicle(
notchCodingWire1 != null,
lineVoltage != null
)
over window:time(10s)
from entry-point "DataStream",
collectList($obj1)
)
$first : $data.get(0)
but i get an error ...
[ERR 102] Line 164:19 mismatched input '0' expecting ')' in rule
"test1" in
pattern $data.get
Does anyone have any ideas what I am doing wrong please?
It's a case of incorrect syntax. "xxx.yyy(zzz)" looks like a pattern
for a fact of type xxx.yyy to the engine, and zzz can't be an integer
literal. You can use $data.get(0) in a (Java) expression, though, but
there's Not enough context shown for more constructive and conclusive
advice.
-W
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