Drools decision table - one column - two fields

Question

Let's suppose we have some class which is related to one or more codes: main and secondary. Every object of this class has at least main code and can have unlimited number of secondary codes:

class Something {

  private String mainCode;
  private List<String> secondaryCodes;
}

I want to make a rule in Drools decision table which allows me to check if value given in column is equal to mainCode or is contained by secondaryCodes. So I need one column for two rules related to two different fields.

Is it even possible?

Answer 1

The constraint can be written as a compound Boolean expression:

mainCode == $param || secondaryCodes contains $param

There's no restriction as to the fields you refer to in such an expression.

Answer 2

You can do this in Guvnor using @{param} in a Condition BRL fragment like:

  $s : Something (maincode == "@{codes}" || secondaryCodes contains "@{codes}"

That gives you one column. -J