10:41 a.m.
Hello everyone,
I got a problem with my rule. To keep it
simple here's the code:
global java.util.ArrayList odmList
rule "Combine ODMAnswers"
when
$a1:ODMAnswer( )
$a2:ODMAnswer( )
eval(odmList contains $a1 && odmList contains $a2)
then
ODMAnswer answer = new ODMAnswer( );
odmList.add(answer);
odmList.remove($a1);
odmList.remove($a2);
end
So why do I get an error message looking like this:
Rule Compilation error Syntax error on token "contains", invalid
AssignmentOperator
odmList.$a2 cannot be resolved or is not a field
Syntax error on token "contains", . expected
Thanks to everyone who reads this.
Bojan
10:47 a.m.
Try this;
rule "Combine ODMAnswers"
when
$a1:ODMAnswer( some check )
$a2:ODMAnswer( assuming something making this one different than
$a1 )
eval(odmList contains $a1 && odmList contains $a2)
then
ODMAnswer answer = new ODMAnswer( );
odmList.add(answer);
odmList.remove($a1);
odmList.remove($a2);
end
On Wed, Jan 16, 2013 at 10:41 AM, Bojan Janisch <
bojan.janisch(a)scai.fraunhofer.de> wrote:
rule "Combine ODMAnswers"
when
$a1:ODMAnswer( )
$a2:ODMAnswer( )
eval(odmList contains $a1 && odmList contains $a2)
then
ODMAnswer answer = new ODMAnswer( );
odmList.add(answer);
odmList.remove($a1);
odmList.remove($a2);
end
10:50 a.m.
Argh...Sorry, wrong key too early...here's the full changes:
rule "Combine ODMAnswers"
when
$list : List( )
$a1:ODMAnswer( some check ) from $list
$a2:ODMAnswer( assuming something making this one different than
$a1 ) from $list
then
$list.add(new ODMAnswer( ));
$list.remove($a1);
$list.remove($a2);
end
On Wed, Jan 16, 2013 at 10:47 AM, Jeremy Ary <jeremy.ary(a)gmail.com> wrote:
Try this;
rule "Combine ODMAnswers"
when
$a1:ODMAnswer( some check )
$a2:ODMAnswer( assuming something making this one different than
$a1 )
eval(odmList contains $a1 && odmList contains $a2)
then
ODMAnswer answer = new ODMAnswer( );
odmList.add(answer);
odmList.remove($a1);
odmList.remove($a2);
end
On Wed, Jan 16, 2013 at 10:41 AM, Bojan Janisch <
bojan.janisch(a)scai.fraunhofer.de> wrote:
> rule "Combine ODMAnswers"
>
> when
> $a1:ODMAnswer( )
> $a2:ODMAnswer( )
>
> eval(odmList contains $a1 && odmList contains $a2)
> then
> ODMAnswer answer = new ODMAnswer( );
> odmList.add(answer);
> odmList.remove($a1);
> odmList.remove($a2);
> end
>
10:54 a.m.
I should note that hopefully you can limit this to something like $list :
ODAList ( ) (a specific extends type of list where you could specify some
criteria to be more specific with) or can assure that you only have one
List in play at that time, or you're going to spend some execution going
through every List in memory to check for these occurrences.
Jeremy
On Wed, Jan 16, 2013 at 10:50 AM, Jeremy Ary <jeremy.ary(a)gmail.com> wrote:
Argh...Sorry, wrong key too early...here's the full changes:
rule "Combine ODMAnswers"
when
$list : List( )
$a1:ODMAnswer( some check ) from $list
$a2:ODMAnswer( assuming something making this one different than
$a1 ) from $list
then
$list.add(new ODMAnswer( ));
$list.remove($a1);
$list.remove($a2);
end
On Wed, Jan 16, 2013 at 10:47 AM, Jeremy Ary <jeremy.ary(a)gmail.com> wrote:
> Try this;
>
> rule "Combine ODMAnswers"
>
> when
> $a1:ODMAnswer( some check )
> $a2:ODMAnswer( assuming something making this one different than
> $a1 )
>
>
> eval(odmList contains $a1 && odmList contains $a2)
> then
> ODMAnswer answer = new ODMAnswer( );
> odmList.add(answer);
> odmList.remove($a1);
> odmList.remove($a2);
> end
>
>
> On Wed, Jan 16, 2013 at 10:41 AM, Bojan Janisch <
> bojan.janisch(a)scai.fraunhofer.de> wrote:
>
>> rule "Combine ODMAnswers"
>>
>> when
>> $a1:ODMAnswer( )
>> $a2:ODMAnswer( )
>>
>> eval(odmList contains $a1 && odmList contains $a2)
>> then
>> ODMAnswer answer = new ODMAnswer( );
>> odmList.add(answer);
>> odmList.remove($a1);
>> odmList.remove($a2);
>> end
>>
>
>
>
11:03 a.m.
Nah thats not gonna work, because I'm using
an ArrayList as a global variable. I'm adding
and removing ODMAnswers in it and always want to
check if there are 2 ODMAnswers in it, to remove
them and generate a new one.
Of course I differ them in their properties, just
wanted to keep the problem simple and understandable.
Do you got another option than creating a local
$list variable?
----- Ursprüngliche Mail -----
Von: "Jeremy Ary" <jeremy.ary(a)gmail.com>
An: "Rules Users List" <rules-users(a)lists.jboss.org>
Gesendet: Mittwoch, 16. Januar 2013 17:54:32
Betreff: Re: [rules-users] Test for element in an arraylist
I should note that hopefully you can limit this to something like $list : ODAList ( ) (a
specific extends type of list where you could specify some criteria to be more specific
with) or can assure that you only have one List in play at that time, or you're going
to spend some execution going through every List in memory to check for these occurrences.
Jeremy
On Wed, Jan 16, 2013 at 10:50 AM, Jeremy Ary < jeremy.ary(a)gmail.com > wrote:
Argh...Sorry, wrong key too early...here's the full changes:
rule "Combine ODMAnswers"
when
$list : List( )
$a1:ODMAnswer( some check ) from $list $a2:ODMAnswer( assuming something making this one
different than $a1 ) from $list
then
$list.add( new ODMAnswer( ) );
$list.remove($a1);
$list.remove($a2);
end
On Wed, Jan 16, 2013 at 10:47 AM, Jeremy Ary < jeremy.ary(a)gmail.com > wrote:
Try this;
rule "Combine ODMAnswers"
when
$a1:ODMAnswer( some check )
$a2:ODMAnswer( assuming something making this one different than $a1 )
eval(odmList contains $a1 && odmList contains $a2)
then
ODMAnswer answer = new ODMAnswer( );
odmList.add(answer);
odmList.remove($a1);
odmList.remove($a2);
end
On Wed, Jan 16, 2013 at 10:41 AM, Bojan Janisch < bojan.janisch(a)scai.fraunhofer.de >
wrote:
rule "Combine ODMAnswers"
when
$a1:ODMAnswer( )
$a2:ODMAnswer( )
eval(odmList contains $a1 && odmList contains $a2)
then
ODMAnswer answer = new ODMAnswer( );
odmList.add(answer);
odmList.remove($a1);
odmList.remove($a2);
end
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rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
3:21 p.m.
You cannot use the operator "contains" in an eval(), where a simple
Java expression
must be written:
eval(odmList.contains($a1) && odmList.contains($a2))
But I agree with Jeremy: the original rule is rather unlikely, as it
would fire for
a single ODMAnswer being contained in the odmList, or two different ODMAnswers
being contained in the list, and then again for the same two ODMAnswers being
contained in the list...
Basics, study the basics...
-W
On 16 January 2013 18:03, Bojan Janisch
<bojan.janisch(a)scai.fraunhofer.de> wrote:
Nah thats not gonna work, because I'm using
an ArrayList as a global variable. I'm adding
and removing ODMAnswers in it and always want to
check if there are 2 ODMAnswers in it, to remove
them and generate a new one.
Of course I differ them in their properties, just
wanted to keep the problem simple and understandable.
Do you got another option than creating a local
$list variable?
----- Ursprüngliche Mail -----
Von: "Jeremy Ary" <jeremy.ary(a)gmail.com>
An: "Rules Users List" <rules-users(a)lists.jboss.org>
Gesendet: Mittwoch, 16. Januar 2013 17:54:32
Betreff: Re: [rules-users] Test for element in an arraylist
I should note that hopefully you can limit this to something like $list : ODAList ( ) (a
specific extends type of list where you could specify some criteria to be more specific
with) or can assure that you only have one List in play at that time, or you're going
to spend some execution going through every List in memory to check for these
occurrences.
Jeremy
On Wed, Jan 16, 2013 at 10:50 AM, Jeremy Ary < jeremy.ary(a)gmail.com > wrote:
Argh...Sorry, wrong key too early...here's the full changes:
rule "Combine ODMAnswers"
when
$list : List( )
$a1:ODMAnswer( some check ) from $list $a2:ODMAnswer( assuming something making this one
different than $a1 ) from $list
then
$list.add( new ODMAnswer( ) );
$list.remove($a1);
$list.remove($a2);
end
On Wed, Jan 16, 2013 at 10:47 AM, Jeremy Ary < jeremy.ary(a)gmail.com > wrote:
Try this;
rule "Combine ODMAnswers"
when
$a1:ODMAnswer( some check )
$a2:ODMAnswer( assuming something making this one different than $a1 )
eval(odmList contains $a1 && odmList contains $a2)
then
ODMAnswer answer = new ODMAnswer( );
odmList.add(answer);
odmList.remove($a1);
odmList.remove($a2);
end
On Wed, Jan 16, 2013 at 10:41 AM, Bojan Janisch < bojan.janisch(a)scai.fraunhofer.de
> wrote:
rule "Combine ODMAnswers"
when
$a1:ODMAnswer( )
$a2:ODMAnswer( )
eval(odmList contains $a1 && odmList contains $a2)
then
ODMAnswer answer = new ODMAnswer( );
odmList.add(answer);
odmList.remove($a1);
odmList.remove($a2);
end
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
4:36 p.m.
So I would ask is there a reason that you've chosen to use a global rather
than inserting it as a fact? If you want rules to reason over it, then why
limit yourself to a global? As a general rule of thumb, if you find your
rule architecture leaning towards evals (such as required for a global
within LHS conditions), you've taken a wrong step and need to reevaluate
your structure. They're intended only as a "last resort" solution to
otherwise unavoidable situations due to their effect on performance.
Jeremy
On Wed, Jan 16, 2013 at 3:21 PM, Wolfgang Laun <wolfgang.laun(a)gmail.com>wrote:
You cannot use the operator "contains" in an eval(), where
a simple
Java expression
must be written:
eval(odmList.contains($a1) && odmList.contains($a2))
But I agree with Jeremy: the original rule is rather unlikely, as it
would fire for
a single ODMAnswer being contained in the odmList, or two different
ODMAnswers
being contained in the list, and then again for the same two ODMAnswers
being
contained in the list...
Basics, study the basics...
-W
On 16 January 2013 18:03, Bojan Janisch
<bojan.janisch(a)scai.fraunhofer.de> wrote:
> Nah thats not gonna work, because I'm using
> an ArrayList as a global variable. I'm adding
> and removing ODMAnswers in it and always want to
> check if there are 2 ODMAnswers in it, to remove
> them and generate a new one.
>
> Of course I differ them in their properties, just
> wanted to keep the problem simple and understandable.
>
> Do you got another option than creating a local
> $list variable?
>
> ----- Ursprüngliche Mail -----
> Von: "Jeremy Ary" <jeremy.ary(a)gmail.com>
> An: "Rules Users List" <rules-users(a)lists.jboss.org>
> Gesendet: Mittwoch, 16. Januar 2013 17:54:32
> Betreff: Re: [rules-users] Test for element in an arraylist
>
>
>
> I should note that hopefully you can limit this to something like $list
: ODAList ( ) (a specific extends type of list where you could specify some
criteria to be more specific with) or can assure that you only have one
List in play at that time, or you're going to spend some execution going
through every List in memory to check for these occurrences.
>
>
> Jeremy
>
>
>
> On Wed, Jan 16, 2013 at 10:50 AM, Jeremy Ary < jeremy.ary(a)gmail.com >
wrote:
>
>
>
> Argh...Sorry, wrong key too early...here's the full changes:
>
>
> rule "Combine ODMAnswers"
>
> when
> $list : List( )
> $a1:ODMAnswer( some check ) from $list $a2:ODMAnswer( assuming something
making this one different than $a1 ) from $list
> then
> $list.add( new ODMAnswer( ) );
> $list.remove($a1);
> $list.remove($a2);
> end
>
>
>
>
>
>
> On Wed, Jan 16, 2013 at 10:47 AM, Jeremy Ary < jeremy.ary(a)gmail.com >
wrote:
>
>
>
>
> Try this;
>
>
> rule "Combine ODMAnswers"
>
> when
> $a1:ODMAnswer( some check )
> $a2:ODMAnswer( assuming something making this one different than $a1 )
>
>
>
> eval(odmList contains $a1 && odmList contains $a2)
> then
> ODMAnswer answer = new ODMAnswer( );
> odmList.add(answer);
> odmList.remove($a1);
> odmList.remove($a2);
> end
>
>
>
>
>
> On Wed, Jan 16, 2013 at 10:41 AM, Bojan Janisch <
bojan.janisch(a)scai.fraunhofer.de > wrote:
>
>
>
> rule "Combine ODMAnswers"
>
> when
> $a1:ODMAnswer( )
> $a2:ODMAnswer( )
>
> eval(odmList contains $a1 && odmList contains $a2)
> then
> ODMAnswer answer = new ODMAnswer( );
> odmList.add(answer);
> odmList.remove($a1);
> odmList.remove($a2);
> end
>
>
>
>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
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6 comments
3 participants
participants (3)
-
Bojan Janisch -
Jeremy Ary -
Wolfgang Laun