Re: [rules-users] Collecting all items of nested collections / accumulate nested collections

2011-10-05 Thread Wolfgang Laun 
If I understood it correctly and have not missed a comma or parenthesis:

rule level three
when
   $l0: Level0()
   $list1: List( size  0 )
  from accumulate (Level1( $level1List: level1List) from $l0.level1List,
init( List l = new ArrayList(); )
action( l.addAll($level1List); )
return( l ) )
   $date: PartialDate()
  from accumulate (Level2((name in (name1, name2),$occurrence:
occurrence) from $list1,
  maxDate($occurence) )
then

-W


2011/10/5 Claes, Kenny [JRDBE - Non JJ] kcl...@its.jnj.com

 I have a question regarding creating a list of items that are all in
nested collections of my main object.

 A high level overview of the model is like this:



 public Level0 {
  private ListLevel1 level1List;
 }



 public Level1 {
  private ListLevel2 level1List;
 }



 public Level2 {
  private Date occurence;
 }



 Now, I add objects of type 0 in the working memory and for each of those
objects, I want to find the latest occurrence of a certain Level2,
regardless of which level1 they belong to.



 If there’s only 2 levels and I want to find the latest occurrence of
Level2’s with a certain name, I can write:



 rule latest level 1

 when

 $l0: Level0()

 $date: Date() from accumulate (Level1(name in (name1, name2),
$occurence: occurence) from $l0.level1List, maxDate($occurence))

 then

   // register fact that latest occurrence of name1/name2 level1 was on
$date

 end



 Now, with 3 levels, since I obviously can’t replace $l0.level1List with
$l0.level1List.level2List, is there a way to create an intermediate list
that will contain all Level2 objects? No filtering needs to take place on
Level1, but if there’s a way to do that too, that would be nice.



 What I currently have is this:



 rule latest level 2

 when

 $l0: Level0()

 $l1: Level1() from $l1.level1List

 $l2List: List(size  0) from collect( Level2(name in ((name1, name2))
from $l1.level2List )

   $date: PartialDate() from accumulate (Level2( $occurence: occurence)
from $l2List, maxDate($occurence))

 then

   // register fact that latest occurrence of name1/name2 level2 was on
$date

 end



 But this does not work as it treats each Level1 seperately: it creates a
“latest occurrence” for all accumulated level2 facts within a level1,
instead of one for the entire set of level 2’s ‘owned’ by the level0 object.



 Any suggestions?

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Re: [rules-users] Collecting all items of nested collections / accumulate nested collections

2011-10-05 Thread Claes, Kenny [JRDBE - Non JJ] 
Excellent, thanks!
 
From: rules-users-boun...@lists.jboss.org
[mailto:rules-users-boun...@lists.jboss.org] On Behalf Of Wolfgang Laun
Sent: 05 October 2011 13:18
To: Rules Users List
Subject: Re: [rules-users] Collecting all items of nested collections /
accumulate nested collections
 
If I understood it correctly and have not missed a comma or parenthesis:

rule level three
when
   $l0: Level0()
   $list1: List( size  0 ) 
  from accumulate (Level1( $level1List: level1List) from
$l0.level1List,
init( List l = new ArrayList(); )
action( l.addAll($level1List); )
return( l ) )
   $date: PartialDate()
  from accumulate (Level2((name in (name1, name2),$occurrence:
occurrence) from $list1, 
  maxDate($occurence) )
then

-W


2011/10/5 Claes, Kenny [JRDBE - Non JJ] kcl...@its.jnj.com

 I have a question regarding creating a list of items that are all in
nested collections of my main object.

 A high level overview of the model is like this:

  

 public Level0 { 
  private ListLevel1 level1List; 
 } 

  

 public Level1 { 
  private ListLevel2 level1List; 
 } 

  

 public Level2 { 
  private Date occurence; 
 } 

  

 Now, I add objects of type 0 in the working memory and for each of
those objects, I want to find the latest occurrence of a certain Level2,
regardless of which level1 they belong to.

  

 If there's only 2 levels and I want to find the latest occurrence of
Level2's with a certain name, I can write:

  

 rule latest level 1

 when

 $l0: Level0()

 $date: Date() from accumulate (Level1(name in (name1, name2),
$occurence: occurence) from $l0.level1List, maxDate($occurence))

 then

   // register fact that latest occurrence of name1/name2 level1
was on $date

 end

  

 Now, with 3 levels, since I obviously can't replace $l0.level1List
with $l0.level1List.level2List, is there a way to create an intermediate
list that will contain all Level2 objects? No filtering needs to take
place on Level1, but if there's a way to do that too, that would be
nice.

  

 What I currently have is this:

  

 rule latest level 2

 when

 $l0: Level0()

 $l1: Level1() from $l1.level1List

 $l2List: List(size  0) from collect( Level2(name in ((name1,
name2)) from $l1.level2List )

   $date: PartialDate() from accumulate (Level2( $occurence:
occurence) from $l2List, maxDate($occurence))

 then

   // register fact that latest occurrence of name1/name2 level2
was on $date

 end

  

 But this does not work as it treats each Level1 seperately: it creates
a latest occurrence for all accumulated level2 facts within a level1,
instead of one for the entire set of level 2's 'owned' by the level0
object.

  

 Any suggestions?

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 rules-users mailing list
 rules-users@lists.jboss.org
 https://lists.jboss.org/mailman/listinfo/rules-users

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