我如何从流口水的对象列表中获取变量列表

Question

My rule is as follows:

when
  C : Company()
  $empname : List() collect from (Employee($empname : empname) from C.employees)
then
  System.out.println($empname);

The corresponding class:

public class Company {
  private List<Employee> employees;
  private Stringlocation;
}

public class Employee {
  private String empname;  
  private int empid;
}

With my code, I am only getting the Employee Objects but how do I get the empnames list?

Answer 1

It's preferable to implement simple data processing algorithms as methods in the class where they belong. Writing rules for this is possible but it's the wrong tool.

rule "employees"
when
   Company( $emps: employees )
   accumulate( Employee( $name: empname ) from $emps; 
               $name: collectList( $name ) )
then
   ... use List $name
end