Thank you Wolfgang, that works brilliantly.
I appreciate your thoughts on Parameters
and will be doing something along that line as that looks cleaner again
- I hadn't gotten up to eliminating magic numbers yet.
Regards,
-Trav
Travis Smith
Analyst Programmer
Development Centre
BNZ
DDI: +644 4746356 (Or Ext 76356)
Wolfgang Laun <wolfgang.laun@gmail.com>
Sent by: rules-users-bounces@lists.jboss.org
17/02/2011 05:44 a.m.
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Subject
| Re: [rules-users] using "contains"
against a List<BigInteger> |
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It's Java, after all...
The "contains" operator requires a Collection (or array) and
an
Object. A plain numeric literal won't result in a BigInteger without
you providing a hint.
You can write
$performance : Performance( calcScore contains
(BigInteger.valueOf(6)) )
or
dialect "mvel"
when
$performance : Performance( calcScore contains
(6I) ) # capital "i"
All of these (and your eval) use magic numbers, so my preferred way of
dealing with this would be s.th. like this, using a singleton
Parameter fact for this and other values:
when
Parameter( $bis: bigIntSix )
$performance : Performance( calcScore contains $bis
)
-W
2011/2/16 <Travis_Smith@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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