7:48 a.m.
Hello,
I am new to Drools. I have downloaded and installed Drools 4.0.7.
After having read the documentation, I saw that it is possible to create
function in the .drl file.
I succeed in creating a function, calling it in the LHS with eval()
instruction or in the RHS.
But, is it possible to call a function in the LHS out of an eval() ? For
example, I would like to use
a pattern such as :
$tmp : MyClass( name == MyFunction() )
Thanks in advance.
Regards.
JB
9:24 a.m.
only inside an eval or return value.
Mark
BINET JEAN-BAPTISTE wrote:
Hello,
I am new to Drools. I have downloaded and installed Drools 4.0.7.
After having read the documentation, I saw that it is possible to
create function in the .drl file.
I succeed in creating a function, calling it in the LHS with eval()
instruction or in the RHS.
But, is it possible to call a function in the LHS out of an eval() ?
For example, I would like to use
a pattern such as :
$tmp : MyClass( name == MyFunction() )
Thanks in advance.
Regards.
JB
------------------------------------------------------------------------
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9:36 a.m.
New subject: LHS Conditional Syntax for drl - date comparison with objects
I'm having a hard time understanding the syntax in the conditional or
left hand side of the DRL. Is it acceptable to use dot notation in the
LHS? Is there a better way to compare fields on different objects?
In the example below, I get an error "Unable to find class $d1. What
limitations are there syntactically on the left hand side? Any help
would be greatly appreciated. I have looked at all the examples and
have googled the problem and don't seem to find the answer.
package com.rules
#list any import classes here.
import com.validate.Date1
import com.validate.Date2
import java.util.Date
#declare any global variables here
rule "Your First Rule"
when
$d1 : Date1()
$d2 : Date2()
$d2 : Date2(beginDate > $d1.getEndDate)
then
#actions
System.out.println("do something");
end
Best regards,
Robert Costello
10 a.m.
New subject: LHS Conditional Syntax for drl - date comparison with objects
*Try this:
*
*rule* "Your First Rule"
*when*
$d1 : Date1( $end1: endDate )
$d2 : Date2()
$d2 : Date2( beginDate > $end1 )
*then*
#actions
System.out.println("do something");
*end*
Costello, Robert wrote:
I'm having a hard time understanding the syntax in the conditional or
left hand side of the DRL. Is it acceptable to use dot notation in
the LHS? Is there a better way to compare fields on different objects?
In the example below, I get an error "Unable to find class $d1. What
limitations are there syntactically on the left hand side? Any help
would be greatly appreciated. I have looked at all the examples and
have googled the problem and don't seem to find the answer.
*package* com.rules
#list any import classes here.
*import* com.validate.Date1
*import* com.validate.Date2
*import* java.util.Date
#declare any global variables here
*rule* "Your First Rule"
*when*
$d1 : Date1()
$d2 : Date2()
$d2 : Date2(beginDate > $d1.getEndDate)
*then*
#actions
System.out.println("do something");
*end*
Best regards,
Robert Costello
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rules-users(a)lists.jboss.org
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10:02 a.m.
New subject: LHS Conditional Syntax for drl - date comparison with objects
Oops, try this:
*rule* "Your First Rule"
*when*
Date1( $end1: endDate )
Date2( beginDate > $end1 )
*then*
#actions
System.out.println("do something");
*end*
Scott Reed wrote:
*Try this:
*
*rule* "Your First Rule"
*when*
$d1 : Date1( $end1: endDate )
$d2 : Date2()
$d2 : Date2( beginDate > $end1 )
*then*
#actions
System.out.println("do something");
*end*
Costello, Robert wrote:
>
> I'm having a hard time understanding the syntax in the conditional or
> left hand side of the DRL. Is it acceptable to use dot notation in
> the LHS? Is there a better way to compare fields on different objects?
>
>
>
> In the example below, I get an error "Unable to find class $d1. What
> limitations are there syntactically on the left hand side? Any help
> would be greatly appreciated. I have looked at all the examples and
> have googled the problem and don't seem to find the answer.
>
>
>
> *package* com.rules
>
>
>
> #list any import classes here.
>
> *import* com.validate.Date1
>
> *import* com.validate.Date2
>
> *import* java.util.Date
>
>
>
> #declare any global variables here
>
>
>
> *rule* "Your First Rule"
>
>
>
> *when*
>
> $d1 : Date1()
>
> $d2 : Date2()
>
> $d2 : Date2(beginDate > $d1.getEndDate)
>
> *then*
>
> #actions
>
> System.out.println("do something");
>
> *end*
>
>
>
> Best regards,
>
>
>
> Robert Costello
>
>
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
1:59 p.m.
New subject: LHS Conditional Syntax for drl - date comparisonwith objects
Wonderful! Thanks very much for your learned response. Java syntax,
then, is more reserved for the right hand side of the rule, which makes
sense, else we would see semi-colons in the LHS.
Thanks again!
Robert Costello
Lead Systems Engineer
IMA Performance
E3- 279A
847.286.0910
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Scott Reed
Sent: Monday, July 14, 2008 10:02 AM
To: Rules Users List
Subject: Re: [rules-users] LHS Conditional Syntax for drl - date
comparisonwith objects
Oops, try this:
rule "Your First Rule"
when
Date1( $end1: endDate )
Date2( beginDate > $end1 )
then
#actions
System.out.println("do something");
end
Scott Reed wrote:
Try this:
rule "Your First Rule"
when
$d1 : Date1( $end1: endDate )
$d2 : Date2()
$d2 : Date2( beginDate > $end1 )
then
#actions
System.out.println("do something");
end
Costello, Robert wrote:
I'm having a hard time understanding the syntax in the conditional or
left hand side of the DRL. Is it acceptable to use dot notation in the
LHS? Is there a better way to compare fields on different objects?
In the example below, I get an error "Unable to find class $d1. What
limitations are there syntactically on the left hand side? Any help
would be greatly appreciated. I have looked at all the examples and
have googled the problem and don't seem to find the answer.
package com.rules
#list any import classes here.
import com.validate.Date1
import com.validate.Date2
import java.util.Date
#declare any global variables here
rule "Your First Rule"
when
$d1 : Date1()
$d2 : Date2()
$d2 : Date2(beginDate > $d1.getEndDate)
then
#actions
System.out.println("do something");
end
Best regards,
Robert Costello
________________________________
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5791
days inactive
5794
days old
5 comments
4 participants
participants (4)
-
BINET JEAN-BAPTISTE -
Costello, Robert -
Mark Proctor -
Scott Reed