Mapping of child classs

[amit sharma]

I have source  class Employee contains reference to base class Student(it is not abstract).  There are two sub classes for Student  ScienceStudent and CommerceStduent

This Student reference in Employee  can point to either ScienceStduent class object or CommerceStudet class object .

Similarly I have Target  DTO Employee with Student reference. I am not understanding how map struct at run time would determine whether Student refer  to ScienceStudent or CommerceStduent.

I provided the mappping between student objects and also child objects but it is not working because it is just showing the field exist in Base student class not child class properties in result.

[Andreas Gudian]

If you are unsure what MapStruct generated mappers do at runtime, just check the generated code... :)

We currently don't support any instanceof-checking and downcasting to known child classes, so you'd have to implement that method on your own, somehow along those lines:

@Mapper

public abstract class EmployeeMapper {

  // impelementation to be generated by MapStruct
  public abstract EmployeeDto toEmployeeDto(Employee employee);

  protected abstract ScienceStudentDto toScienceStudentDto(ScienceStudent s);

  // manually implemented helper method

  protected StudentDto toStudentDto(Student student) {

    if ( student instanceof ScienceStudent ) {

      return toScienceStudentDto( (ScienceStudent) student );

    else if (student instanceof CommerceStudent ) {
      ..
    }

    return null;
  }
}

Hope it helps,

Andreas

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[amit sharma]

This for the response what if I have some thing like this 

Target

=========

Employee{

StudentArrayClass student

}

source

=====

Employee{

Student[] student

}

StudentArrayClass{

List<Student> studentList

}

We have child classes  ScienceStudent and CommerceStudent of Student.

[Amit Sharma]

Thank you so much for the response. I have few other thing 

This for the response what if I have some thing like this 

Target

=========

Employee{

StudentArrayClass student

}

source

=====

Employee{

Student[] student

}

StudentArrayClass{

List<Student> studentList

}

We have child classes  ScienceStudent and CommerceStudent of Student.

I converted the Student[] to  Student List  and then List to StudentArrayClass and the used your code to map child classes.