Spring & mapstruct, generate a mapper using a parameterized constructor?-CodePudding

Mapstruct always generate mappers that use a default empty constructor and setters to construct an object.

I need mapstruct to construct objects using parameterized constructor instead.

I have this mapper configured using maptruct:

@Mapper(componentModel = "spring")
public interface FlightMapper {
    FlightBooking  flightBookingPostRequestDtoToFlightBooking(FlightBookingPostRequestDto flightBookingDto);
}

The implementation that mapstruct generates uses the default constructor without parameters:

public FlightBooking flightBookingPostRequestDtoToFlightBooking(FlightBookingPostRequestDto     flightBookingDto) {
    if ( flightBookingDto == null ) {
        return null;
    }

    FlightBooking flightBooking = new FlightBooking();

    flightBooking.setFlight_booking_id( flightBookingDto.getBooking_id() );

    return flightBooking;
}

But I need this implementation with a parameterized constructor instead:

public FlightBooking flightBookingPostRequestDtoToFlightBooking(FlightBookingPostRequestDto    flightBookingDto) {
    if ( flightBookingDto == null ) {
        return null;
    }

    FlightBooking flightBooking = new FlightBooking(flightBookingDto.getBooking_id());

    return flightBooking;
}

How can I configure mapstruct to achieve this? I haven't found any responses in the official documentation. Thanks in advance

CodePudding user response：

You have to write a mapper, checkout their getting started guide https://mapstruct.org/

@Mapper 
public interface FlightBookingMapper {
 
    FlightBookingMapper INSTANCE = Mappers.getMapper( FlightBookingMapper.class ); 
 
    @Mapping(source = "booking_id", target = "Flight_booking_id")
    FlightBooking flightBookingToFlightBookingDto(FlightBooking flightBooking);
}

CodePudding user response：

Since the 1.4 release, MapStruct supports using constructors when instantiating mapping targets.

One solution would be marking the parametrized constructor as @Default. For more possible solutions and more details on how the Constructor support works have a look at the reference guide.