[rules-users] Calling a method in when part

[Sumeet Karawal]

Hi,

Below is the drl that I am using and the class that it is referring to:

Drl:

package rules.person

import com.person.Age
Import com.person.Classification

rule "Check_person.option1"

when

$age : com.person.Age()
$classification : com.person.Classification()

eval ($age.getClassification("16"))

then

modify ($classification) {$classification.setResult('"Teenager"; }

end

rule "Check_person.option2"

when

$age : com.person.Age()
$classification : com.person.Classification()

eval ($age.getClassification("40"))

then

modify ($classification) {$classification.setResult('"Adult"; }

end


Application Class :

public class Age
{
	public string getClassification(String name) {
		<Logic of the application>
		return str;
	}
}

public class Classification
{
	public void setResult(String name) {
		<Logic of the application>

	}
}



Queries :

   Please let me know if I am using the 'when' part correctly.
   And please check for the use of the object 'classification' in my
   application (as return value to the application)




Thanks & Regards,
Sumeet Karawal
Mailto: sumeet.karawal at tcs.com


                                                                                                                                  
  From:       Wolfgang Laun <wolfgang.laun at gmail.com>                                                                             
                                                                                                                                  
  To:         Rules Users List <rules-users at lists.jboss.org>                                                                      
                                                                                                                                  
  Date:       08/10/2011 03:03 PM                                                                                                 
                                                                                                                                  
  Subject:    Re: [rules-users] Calling a method in when part                                                                     
                                                                                                                                  
  Sent by:    rules-users-bounces at lists.jboss.org                                                                                 
                                                                                                                                  





If you don't show your code we can't tell you what is wrong with it. So I
think what you may have to do is

when
   $someObj: SomeClass()  # matches each WME of SomeClass
   eval( $someObj.getValueBoolean("abc"))
then

There is not much to be gained by using a DRL function; it would have to be
called like
   eval( someFunction( $someObj, "abc" ) )

-W


On 10 August 2011 11:05, Sumeet Karawal <sumeet.karawal at tcs.com> wrote:

  Hi,

  I have a requirement where there is a customized Java class having a
  method
  that returns some value.
  like:

  getValueBoolean("Some String")

  { //some calculation
    // returns a boolean value
  }

  The default getters and setters are not being used in the Application.
  The
  value that is being returned by the method needs to be checked in
  the .drl
  file.
  There are different Java classes with these kind of methods. Where the
  string and integer value is also returned. I have gone through the
  documentation for Drools-Expert but have only found the implementation
  for
  the method in the consequence part, i.e., the then part.

  This is how I tried:

  importing the class

  in when
  binding the a variable to the Class name suppose $c
  eval ($c.getValueBoolean("abc"))
  then
  System.out.println("the value is true")


  It didn't work this way.
  I tried by another way like :

  creating a function in the .drl itself that calls the method of that
  class
  and returns a value
  then calling this drl function in the when part and carrying on.

  It would be very helpful if some body could let me know how to do this in
  the .drl.


  Thanks & Regards,
  Sumeet Karawal
  Mailto: sumeet.karawal at tcs.com

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