[rules-users] Action Object and Condition Object in XLS DTABLE

[Ramon Buckland]

Here is how I have solved it.. 

CONDITION
$c: ConditionObject
/* $1 */
Got Object
YES
YES
YES
YES


and that produces .. 

	when
		$c: ConditionObject(/* YES */)

for every rule where there is a "YES". I didn't want to overcomplicate the test for Drools .. i.e. : Object() is sufficient

-== Some other things I found ==-

I found a behaviour about rule generation which was not expected. 
a CONDITION can have nothing in the "Object row" (the first row down).. that is good.
and the code in the "code" row, (next row after) will be put in the When .. nice.
ie: 

CONDITION

$c : ConditionObject(  /* $1 */ )
Description
YES
YES


What is unexpected is that .. these "rules" get reordered such that, if they are at the from (column A) and there is a CONDITION in column B that looks like

CONDITION
$e: FieldObject( ) from $c.field
aField
Description
A
B


the rule will look like 

when 
   $e: FieldObject( aField == "A" ) from $c.field
   $c: ConditionObject( /* YES */ )


This occurs (looking at the source code : https://github.com/droolsjbpm/drools/blob/master/drools-decisiontables/src/main/java/org/drools/decisiontable/parser/DefaultRuleSheetListener.java)
because it adds each "CONDITION" into a list on a row by row basis; It will add the CONDITION in column B first, before the Condition in Column A because there is no data in Column "A",first cell.

hope that helps someone somewhere 


Ramon Buckland
ramon at thebuckland.com



On 22 May 2013, at 12:18, Ramon Buckland <ramon at thebuckland.com> wrote:

> Hi, 
> 
> Thanks for the response. 
> 
> That doesn't seem to be right - this is what is produced from the Compiler.
> 
> // rule values at A9, header at A3
> rule "Test rule_9"
> 	when
> 		$c : ConditionObject(somefield)
> 		$a : ActionObject(this != null == "X")
> 		EmbeddedObject(myField == AnEnum.SomeOtherValue) from $c.embedded
> 	then
> 		ActionObject.someMethod2(50);
> 		$a.someMethod("someOtherValue")
> 		$a.someMethod3(B)
> end
> 
> Is there a way to have a "when" rule produced where the data table row, for that CONDITION is empty ? 
> The hack version I can work out is
> 
>> CONDITION
>> $a : ActionObject
>> $param != null
>> this
>> this
> 
> 
> Ramon Buckland
> ramon at thebuckland.com
> 
> 
> 
> On 22 May 2013, at 10:33, Michael Anstis <michael.anstis at gmail.com> wrote:
> 
>> Add an additional CONDITION for ActionObject.
>> 
>> You'll need to probably add a constraint for "this != null" and put an X in the rows; e.g.
>> 
>> CONDITION
>> $a : ActionObject
>> this != null
>> X
>> X
>> 
>> 
>> 
>> 
>> On 22 May 2013 09:55, Ramon Buckland <ramon at thebuckland.com> wrote:
>> Hi. 
>> 
>> I am working on Drools 5.5.0.Final and have a question regarding XLS and a Decision Table structure,
>> 
>> I have a ConditionObject and an ActionObject and wanted to know or see an example for XLS that produces a "does exist" for the ActionObject
>> in the when.
>> 
>> I can simply write the rule in a DRL, but translating how to make the XLS compiler create the same is proving challenging.
>> 
>> An example:
>> 
>> I want to produce a set of rules like below
>> 
>> rule "Test rule_11"
>> when
>>     $c : ConditionObject( somefield )
>>     EmbeddedObject(myField == AnEnum.SomeValue) from $c.embedded
>>     $a : ActionObject( )
>> then 
>>     $a.someMethod("value")
>>     $a.someMethod2(10)
>>     $a.someMethod3("A")
>> end
>> 
>> rule "Test rule_12"
>> // some other AnEnum checks.
>> 
>> What I can't work out is how I get the test of "existence" of the Action Object into the "when" for the rule, so that I can "use" the Object in the ACTION.
>> In addition, is there a away that I can avoid needing a whole column just for "existence of an object with a field.. collect as a variable $c : (ConditionObject( somefield )" ?
>> 
>> CONDITION			CONDITION						ACTION					ACTION				ACTION
>> $c : ConditionObject		EmbeddedObject() from $c.embedded	
>> $param				myField == AnEnum.$param			$a.someMethod("$param")	$a.someMethod2($param)	$a.someMethod3($param)
>> "Description"			"Description"						"Description"				"Description"			"Description"
>> somefield				SomeValue						value					10					A	
>> somefield				SomeOtherValue					someOtherValue			50					B
>> 
>> This is the XLS of the above.
>> 
>> https://www.dropbox.com/s/lw3zb5hwtjdbpcm/sample_rules.xls?v=1scns
>> 
>> When this sheet is compiled, I get the following: How do I setup a "condition" for ActionObject to get in the when ?
>> 
>> package packageName;
>> //generated from Decision Table
>> // rule values at A8, header at A3
>> rule "Test rule_8"
>> 	when
>> 		$c : ConditionObject(somefield)
>> 		EmbeddedObject(myField == AnEnum.SomeValue) from $c.embedded
>> 	then
>> 		$a.someMethod("value")
>> 		$a.someMethod2(10)
>> 		$a.someMethod3(A)
>> end
>> 
>> // rule values at A9, header at A3
>> rule "Test rule_9"
>> 	when
>> 		$c : ConditionObject(somefield)
>> 		EmbeddedObject(myField == AnEnum.SomeOtherValue) from $c.embedded
>> 	then
>> 		$a.someMethod("someOtherValue")
>> 		$a.someMethod2(50)
>> 		$a.someMethod3(B)
>> end
>> 
>> 
>> 
>> 
>> Ramon Buckland
>> ramon at thebuckland.com
>> 
>> 
>> 
>> 
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