Add String values to ArrayList<String> field from Guided Rules

[AV]

Hi,

I have an object Student and which has a field Subjects which is of type private ArrayList<String>,

public class Student implements ... {

..............

...............

private ArrayList<String> subjects

..........

............

}

I need to add subjects (which is an arraylist of type String) under the Student object from a guided rule but all I get in a guided rule is a text box for literal value.

I am trying to avoid free form DRL. I tried the change and modify options for the student object in the action part but they give the same text box to put a literal value which fails during compilation.

Has anyone tried to add String values to an ArrayList of String type from a Guided rule?

Thanks,

AV

[Michael Anstis]

If you bind the subjects field to a variable; you can call a method on the List to add either a literal or bound String.

​

rule "r2"

dialect "mvel"

when

$hl : HasList( $subjects : subjects != null )

$s : String( )

then

$subjects.add( $s );

end

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[AV]

Hi Michael,

This is what I was looking for. Thanks a ton for your help.

Is there a way I can assign populate subjects arraylist which is under the object student from a guided decision table.

I added a method called addSubjects to the java POJO I am using. Now when i add an action column and select the action to call a method on Student, it shows addSubjects and option for the String but after I click String, I have to put a value for the subject placeholder which is then applicable for all the rows in the decision table however, I need to assign different subjects from different rows which ever applicable. Is there a way to do it?

Thanks,

AV

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