3:03 p.m.
A recent post was asking for options to do a sort in a DRL query.
(More generally, you could ask for any transformation of a
collection.) Below is what I finally managed to get to work, with
Collection sortByKey(List x)
doing the actual sort, no matter how.
query "sortedItems"
$facts: List() from collect ( Fact() )
$values: Collection() from collect ( Fact() from sortByKey( $facts ) )
end
What looks clumsy to me is the 2nd pattern where you must unravel the
sorted collection so that you can collect it into the same thing,
which can then be bound to $values.
This is what one would like to have - but I think this is too rarely
required to warrant an additional operator.
query "sortedItems"
$facts: List() from collect ( Fact() )
$values: Collection() <missing operator> sortByKey( $facts )
end
-W
3:17 p.m.
What about a "custom" accumulate function?
query "sortedItems"
$sortedValues: List() from accumulate (
$f : Fact()
sortByAnyMethodYouPrefer( $f )
)
end
We could provide some implementations, even better if incremental.
In the future, we'll probably provide even better native support for
this kind of operations.
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3:31 p.m.
On 29 November 2011 15:17, Davide Sottara <dsotty(a)gmail.com> wrote:
What about a "custom" accumulate function?
Then I might as well use init/action/result, as the original poster
did. Also according to him, having it all in DRL is sometimes
preferable. If you have the collection already there (not as the
result of a "from collect" as in my example) a direct transformation
from collection to collection would be preferable.
But, again, I think this is too rarely needed to warrant a new feature.
query "sortedItems"
$sortedValues: List() from accumulate (
$f : Fact()
sortByAnyMethodYouPrefer( $f )
)
end
We could provide some implementations, even better if incremental.
In the future, we'll probably provide even better native support for
this kind of operations.
--
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http://drools.46999.n3.nabble.com/DRL-sorting-Bind-to-eval-result-tp35452...
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Nabble.com.
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4:36 p.m.
I would like to add sorting via the "filter" proposal we have, see
"filters"
http://community.jboss.org/wiki/RelationalDataFlows
Mark
On Tue, Nov 29, 2011 at 2:31 PM, Wolfgang Laun <wolfgang.laun(a)gmail.com>wrote:
On 29 November 2011 15:17, Davide Sottara <dsotty(a)gmail.com>
wrote:
> What about a "custom" accumulate function?
>
Then I might as well use init/action/result, as the original poster
did. Also according to him, having it all in DRL is sometimes
preferable. If you have the collection already there (not as the
result of a "from collect" as in my example) a direct transformation
from collection to collection would be preferable.
But, again, I think this is too rarely needed to warrant a new feature.
> query "sortedItems"
> $sortedValues: List() from accumulate (
> $f : Fact()
> sortByAnyMethodYouPrefer( $f )
> )
> end
>
> We could provide some implementations, even better if incremental.
> In the future, we'll probably provide even better native support for
> this kind of operations.
>
> --
> View this message in context:
http://drools.46999.n3.nabble.com/DRL-sorting-Bind-to-eval-result-tp35452...
> Sent from the Drools: Developer (committer) mailing list mailing list
archive at Nabble.com.
> _______________________________________________
> rules-dev mailing list
> rules-dev(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-dev
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3 comments
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participants (3)
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Davide Sottara -
Mark Proctor -
Wolfgang Laun