2:51 p.m.
It appears as if accumulate does support only a single pattern CE as
source pattern, e.g.:
Number() from accumulate(
Cheese(
price : price
),
sum( price )
)
Is it possible to have more than one pattern in the source pattern, e.g.:
Number() from accumulate(
Cheese(
price : price,
type : type
)
Person(
favouriteCheese == type,
age > 30
),
sum( price )
)
The same could be said for collect, but there the problem to specify
which item of a matching tuple is to be collected, but this could be
handled recreating collect via accumulate, e.g.:
Collection() from accumulate(
cheese : Cheese(
type : type
)
Person(
favouriteCheese == type,
age > 30
),
collect( cheese )
)
3:17 p.m.
Single pattern in accumulate is all we support at the moment. Multiple
patterns will be added for the next major release.
Multiple patterns for accumulate would be interestingly. It would
effectively be a list of array of objects. Add a jira for it :)
Mark
Mark
Juergen wrote:
It appears as if accumulate does support only a single pattern CE as
source pattern, e.g.:
Number() from accumulate(
Cheese(
price : price
),
sum( price )
)
Is it possible to have more than one pattern in the source pattern, e.g.:
Number() from accumulate(
Cheese(
price : price,
type : type
)
Person(
favouriteCheese == type,
age > 30
),
sum( price )
)
The same could be said for collect, but there the problem to specify
which item of a matching tuple is to be collected, but this could be
handled recreating collect via accumulate, e.g.:
Collection() from accumulate(
cheese : Cheese(
type : type
)
Person(
favouriteCheese == type,
age > 30
),
collect( cheese )
)
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3:21 p.m.
Juergen,
Yes, accumulate only supports a single source pattern. I will implement
support to multi-pattern as soon as we close the nastiest open bugs in the
next few days.
[]s
Edson
2007/8/21, Juergen <work_registries(a)web.de>:
It appears as if accumulate does support only a single pattern CE as
source pattern, e.g.:
Number() from accumulate(
Cheese(
price : price
),
sum( price )
)
Is it possible to have more than one pattern in the source pattern, e.g.:
Number() from accumulate(
Cheese(
price : price,
type : type
)
Person(
favouriteCheese == type,
age > 30
),
sum( price )
)
The same could be said for collect, but there the problem to specify
which item of a matching tuple is to be collected, but this could be
handled recreating collect via accumulate, e.g.:
Collection() from accumulate(
cheese : Cheese(
type : type
)
Person(
favouriteCheese == type,
age > 30
),
collect( cheese )
)
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rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
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Edson Tirelli
Software Engineer - JBoss Rules Core Developer
Office: +55 11 3529-6000
Mobile: +55 11 9287-5646
JBoss, a division of Red Hat @ www.jboss.com
9:58 a.m.
Hi,
I found that accumulate only supports Single pattern as source. I found this
thread and I can see here that it was planned to implement, but at least my
attempt to apply more then one pattern is not working. I got an error:
mismatched input ',' expecting ')'
So I wonder, is it not implemented yet (version 5.1.0.M1) or I simply use it
incorrectly (it is possible, because I am new to drools).
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10:37 a.m.
On 20/12/2010 08:58, AleBu wrote:
Hi,
I found that accumulate only supports Single pattern as source. I found this
thread and I can see here that it was planned to implement, but at least my
attempt to apply more then one pattern is not working. I got an error:
mismatched input ',' expecting ')'
So I wonder, is it not implemented yet (version 5.1.0.M1) or I simply use it
incorrectly (it is possible, because I am new to drools).
Yes it exists in 5.x
Mark
11:35 a.m.
Hi Mark,
Can you tell me what is wrong then with a rule below (WHEN part provided):
when
$order: Order( $orderId: id, $userId: userId, $orderParts: orderPart /*
this is a collection */ )
$user: User( id == $userId, $userOrderMoneyLimit: orderMoneyLimit )
Double( $orderTotal: doubleValue ) from accumulate (
OrderPart( $orderPartItemId: itemId, $orderPartItemAmount: amount ) from
$orderParts
Item( $itemPrice: price, id == $orderPartItemId ), // Line NNN
init( double total=0; ),
action( total += $itemPrice * $orderPartItemAmount; ),
reverse( rval -= $itemPrice * $orderPartItemAmount; ),
result( total )
)
I got an error:
mismatched input 'Item' expecting ')' in rule "XXX"[NNN,53]:
[ERR 102] Line
NNN:53 mismatched input ',' expecting 'then' in rule "XXX"
I tried to group both patterns with () but with the same result.
Also, by changing rule to the one below (by removing second pattern and
simulating $itemPrice):
when
$order: Order( $orderId: id, $userId: userId, $orderParts: orderPart /*
this is a collection */ )
$user: User( id == $userId, $userOrderMoneyLimit: orderMoneyLimit )
Double( $orderTotal: doubleValue ) from accumulate (
OrderPart( $orderPartItemId: itemId, $orderPartItemAmount: amount ) from
$orderParts,
init( double total=0; double $itemPrice=3.33; ),
action( total += $itemPrice * $orderPartItemAmount; ),
reverse( rval -= $itemPrice * $orderPartItemAmount; ),
result( total )
)
Everything works fine.
So, it looks like that problem is related to Second pattern. Is there some
special syntax for it?
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12:15 p.m.
Didn't you say you were on Drools 4? if so you can't use multiple patterns.
Mark
On 20/12/2010 10:35, AleBu wrote:
Hi Mark,
Can you tell me what is wrong then with a rule below (WHEN part provided):
when
$order: Order( $orderId: id, $userId: userId, $orderParts: orderPart /*
this is a collection */ )
$user: User( id == $userId, $userOrderMoneyLimit: orderMoneyLimit )
Double( $orderTotal: doubleValue ) from accumulate (
OrderPart( $orderPartItemId: itemId, $orderPartItemAmount: amount ) from
$orderParts
Item( $itemPrice: price, id == $orderPartItemId ), // Line NNN
init( double total=0; ),
action( total += $itemPrice * $orderPartItemAmount; ),
reverse( rval -= $itemPrice * $orderPartItemAmount; ),
result( total )
)
I got an error:
mismatched input 'Item' expecting ')' in rule "XXX"[NNN,53]:
[ERR 102] Line
NNN:53 mismatched input ',' expecting 'then' in rule "XXX"
I tried to group both patterns with () but with the same result.
Also, by changing rule to the one below (by removing second pattern and
simulating $itemPrice):
when
$order: Order( $orderId: id, $userId: userId, $orderParts: orderPart /*
this is a collection */ )
$user: User( id == $userId, $userOrderMoneyLimit: orderMoneyLimit )
Double( $orderTotal: doubleValue ) from accumulate (
OrderPart( $orderPartItemId: itemId, $orderPartItemAmount: amount ) from
$orderParts,
init( double total=0; double $itemPrice=3.33; ),
action( total += $itemPrice * $orderPartItemAmount; ),
reverse( rval -= $itemPrice * $orderPartItemAmount; ),
result( total )
)
Everything works fine.
So, it looks like that problem is related to Second pattern. Is there some
special syntax for it?
12:20 p.m.
No. I am on the latest and have no restrictions on version. I posted to this
thread because I found it the most revelant thread for this question.
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12:28 p.m.
Within accumulate(...) and in similar constructs, the logical operators must
be
written; the "and" is not implied.
OrderPart( $orderPartItemId: itemId, $orderPartItemAmount: amount ) from
$orderParts
and
Item( $itemPrice: price, id == $orderPartItemId )
-W
On 20 December 2010 11:35, AleBu <aleboo(a)gmail.com> wrote:
Hi Mark,
Can you tell me what is wrong then with a rule below (WHEN part provided):
when
$order: Order( $orderId: id, $userId: userId, $orderParts:
orderPart /*
this is a collection */ )
$user: User( id == $userId, $userOrderMoneyLimit:
orderMoneyLimit )
Double( $orderTotal: doubleValue ) from accumulate (
OrderPart( $orderPartItemId: itemId,
$orderPartItemAmount: amount ) from
$orderParts
Item( $itemPrice: price, id == $orderPartItemId ),
// Line NNN
init( double total=0; ),
action( total += $itemPrice * $orderPartItemAmount;
),
reverse( rval -= $itemPrice * $orderPartItemAmount;
),
result( total )
)
I got an error:
mismatched input 'Item' expecting ')' in rule "XXX"[NNN,53]:
[ERR 102] Line
NNN:53 mismatched input ',' expecting 'then' in rule "XXX"
I tried to group both patterns with () but with the same result.
Also, by changing rule to the one below (by removing second pattern and
simulating $itemPrice):
when
$order: Order( $orderId: id, $userId: userId, $orderParts:
orderPart /*
this is a collection */ )
$user: User( id == $userId, $userOrderMoneyLimit:
orderMoneyLimit )
Double( $orderTotal: doubleValue ) from accumulate (
OrderPart( $orderPartItemId: itemId,
$orderPartItemAmount: amount ) from
$orderParts,
init( double total=0; double $itemPrice=3.33; ),
action( total += $itemPrice * $orderPartItemAmount;
),
reverse( rval -= $itemPrice * $orderPartItemAmount;
),
result( total )
)
Everything works fine.
So, it looks like that problem is related to Second pattern. Is there some
special syntax for it?
--
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http://drools-java-rules-engine.46999.n3.nabble.com/Drools-4-0-Support-fo...
Sent from the Drools - User mailing list archive at Nabble.com.
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8 comments
5 participants
participants (5)
-
AleBu -
Edson Tirelli -
Juergen -
Mark Proctor -
Wolfgang Laun