[rules-users] using "contains" against a List<BigInteger>

[Travis_Smith at bnz.co.nz]

Hi,

A newbie question I'm afraid. I've been unsuccessful searching the 
mailing-list archive (and google) for this.

I'm trying to simplify rule-writing for Statistical Analysts to be able to 
write rules. I'm hoping to achieve this without resort to DSLR files and a 
DSL if possible as we currently need them for nothing else

One of the situations I have is the following:
--------------------
when
$performance : Performance(
        eval(calcScore.contains(BigInteger.valueOf(6)))
)
then
[...]
--------------------

That works absolutely fine: CustAccPerf being a having several members, 
including an ArrayList<BigInteger> called calcScore

Howwever I'd like to rewrite it like:
--------------------
when

$performance : Performance( calcScore contains 6 )
then
[...]
--------------------

Given the support for BigInteger & BigDecimal type comparison, and the 
structure of the 'contains' operator, I couldn't see why this wouldn't 
work.

If someone could explain this would be excellent - for now I'm gong ahead 
with the eval, but from a non-technical usability POV the latter form 
would be far preferable: I'd prefer that the users don't have to worry 
about eval or BigInteger, and while I realize it's not possible 
(currently) to eliminate that altogether, I would like to eliminate as 
many of the (to quote) "meaningless tech stuff" questions as possible.

Alternately if some kind person wants to tell me a better way of 
structuring that rule so I can use it as a template, then that'd be 
welcome also.

Unfortunately we're dealing with a feed from a 3rd party system so 
restructuring the data is not a desirable option.

Thank you for your time,
-Trav

Travis Smith
Analyst Programmer
Development Centre
BNZ


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