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Bael-9151, How to Map a Source Object to the Target List Using Mapstruct?
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‎mapstruct-2/pom.xml

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<version>${lombok.mapstruct.binding.version}</version>
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</path>
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</annotationProcessorPaths>
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<source>17</source>
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<target>17</target>
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</configuration>
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</plugin>
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</plugins>
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</build>
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<properties>
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<org.mapstruct.version>1.6.0.Beta2</org.mapstruct.version>
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<org.mapstruct.version>1.6.3</org.mapstruct.version>
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<lombok.mapstruct.binding.version>0.2.0</lombok.mapstruct.binding.version>
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</properties>
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‎mapstruct-2/src/main/java/com/baeldung/list/CarMapper.java

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package com.baeldung.list;
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import java.util.Arrays;
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import org.mapstruct.Mapper;
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import org.mapstruct.Mapping;
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import org.mapstruct.factory.Mappers;
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import com.baeldung.list.entity.Car;
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import com.baeldung.list.entity.CarDto;
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import com.baeldung.list.entity.ManufacturingPlantDto;
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@Mapper(imports = { Arrays.class, ManufacturingPlantDto.class })
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public interface CarMapper {
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CarMapper INSTANCE = Mappers.getMapper(CarMapper.class);
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@Mapping(target = "numberOfSeats", source = "seats")
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@Mapping(
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target = "manufacturingPlantDtos",
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expression = """
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java(Arrays.asList(
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new ManufacturingPlantDto(car.getPlant1(), car.getPlant1Loc()),
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new ManufacturingPlantDto(car.getPlant2(), car.getPlant2Loc())
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))
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"""
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)
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CarDto carToCarDto(Car car);
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}

‎mapstruct-2/src/main/java/com/baeldung/list/CarMapperDecorator.java

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package com.baeldung.list;
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import java.util.Arrays;
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import java.util.List;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import com.baeldung.list.entity.Car;
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import com.baeldung.list.entity.CarDto;
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import com.baeldung.list.entity.ManufacturingPlantDto;
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public abstract class CarMapperDecorator implements CustomCarMapper {
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private final Logger logger = LoggerFactory.getLogger(CarMapperDecorator.class);
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private CustomCarMapper delegate;
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public CarMapperDecorator(CustomCarMapper delegate) {
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this.delegate = delegate;
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}
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@Override
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public CarDto carToCarDto(Car car) {
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logger.info("calling Mapper decorator");
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CarDto carDto = delegate.carToCarDto(car);
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carDto.setManufacturingPlantDtos(getManufacturingPlantDtos(car));
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return carDto;
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}
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private List<ManufacturingPlantDto> getManufacturingPlantDtos(Car car) {
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// some custom logic or transformation which may require calls to other services
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return Arrays.asList(
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new ManufacturingPlantDto(car.getPlant1(), car.getPlant1Loc()),
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new ManufacturingPlantDto(car.getPlant2(), car.getPlant2Loc())
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);
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}
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}

‎mapstruct-2/src/main/java/com/baeldung/list/CustomCarMapper.java

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package com.baeldung.list;
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import org.mapstruct.DecoratedWith;
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import org.mapstruct.Mapper;
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import org.mapstruct.Mapping;
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import org.mapstruct.factory.Mappers;
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import com.baeldung.list.entity.Car;
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import com.baeldung.list.entity.CarDto;
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@Mapper
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@DecoratedWith(CarMapperDecorator.class)
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public interface CustomCarMapper {
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CustomCarMapper INSTANCE = Mappers.getMapper(CustomCarMapper.class);
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@Mapping(source = "seats", target = "numberOfSeats")
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CarDto carToCarDto(Car car);
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}

‎mapstruct-2/src/main/java/com/baeldung/list/QualifiedByNameCarMapper.java

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package com.baeldung.list;
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import java.util.List;
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import org.mapstruct.Mapper;
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import org.mapstruct.Mapping;
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import org.mapstruct.Named;
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import org.mapstruct.factory.Mappers;
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import com.baeldung.list.entity.Car;
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import com.baeldung.list.entity.CarDto;
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import com.baeldung.list.entity.ManufacturingPlantDto;
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@Mapper
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public interface QualifiedByNameCarMapper {
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QualifiedByNameCarMapper INSTANCE = Mappers.getMapper(QualifiedByNameCarMapper.class);
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@Mapping(source = "seats", target = "numberOfSeats")
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@Mapping(target = "manufacturingPlantDtos", source = "car", qualifiedByName = "mapPlants")
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CarDto carToCarDto(Car car);
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@Named("mapPlants")
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default List<ManufacturingPlantDto> mapPlants(Car car) {
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return List.of(
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new ManufacturingPlantDto(car.getPlant1(), car.getPlant1Loc()),
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new ManufacturingPlantDto(car.getPlant2(), car.getPlant2Loc())
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);
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}
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}

‎mapstruct-2/src/main/java/com/baeldung/list/entity/Car.java

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package com.baeldung.list.entity;
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public class Car {
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private String make;
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private String model;
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private int year;
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private int seats;
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private String plant1;
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private String plant1Loc;
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private String plant2;
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private String plant2Loc;
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public Car(String make, String model, int year, int seats) {
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this.make = make;
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this.model = model;
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this.year = year;
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this.seats = seats;
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}
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public String getPlant2() {
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return plant2;
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}
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public void setPlant2(String plant2) {
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this.plant2 = plant2;
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}
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public String getPlant2Loc() {
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return plant2Loc;
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}
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public void setPlant2Loc(String plant2Loc) {
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this.plant2Loc = plant2Loc;
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}
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public String getPlant1Loc() {
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return plant1Loc;
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}
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public void setPlant1Loc(String plant1Loc) {
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this.plant1Loc = plant1Loc;
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}
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public String getPlant1() {
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return plant1;
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}
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public void setPlant1(String plant1) {
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this.plant1 = plant1;
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}
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public int getSeats() {
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return seats;
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}
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public void setSeats(int seats) {
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this.seats = seats;
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}
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public String getMake() {
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return make;
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}
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public String getModel() {
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return model;
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}
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public int getYear() {
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return year;
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}
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}

‎mapstruct-2/src/main/java/com/baeldung/list/entity/CarDto.java

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package com.baeldung.list.entity;
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import java.util.List;
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public class CarDto {
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private String make;
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private String model;
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private int year;
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private int numberOfSeats;
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private List<ManufacturingPlantDto> manufacturingPlantDtos;
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public CarDto(String make, String model, int year, int numberOfSeats) {
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this.make = make;
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this.model = model;
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this.year = year;
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this.numberOfSeats = numberOfSeats;
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}
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public void setMake(String make) {
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this.make = make;
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}
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public void setModel(String model) {
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this.model = model;
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}
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public void setYear(int year) {
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this.year = year;
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}
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public List<ManufacturingPlantDto> getManufacturingPlantDtos() {
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return manufacturingPlantDtos;
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}
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public void setManufacturingPlantDtos(List<ManufacturingPlantDto> manufacturingPlantDtos) {
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this.manufacturingPlantDtos = manufacturingPlantDtos;
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}
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public int getNumberOfSeats() {
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return numberOfSeats;
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}
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public void setNumberOfSeats(int numberOfSeats) {
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this.numberOfSeats = numberOfSeats;
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}
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public String getMake() {
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return make;
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}
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public String getModel() {
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return model;
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}
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public int getYear() {
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return year;
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}
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}

‎mapstruct-2/src/main/java/com/baeldung/list/entity/ManufacturingPlantDto.java

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package com.baeldung.list.entity;
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public class ManufacturingPlantDto {
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private String plantName;
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private String location;
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public ManufacturingPlantDto(String plantName, String location) {
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this.plantName = plantName;
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this.location = location;
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}
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public String getPlantName() {
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return plantName;
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}
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public void setPlantName(String plantName) {
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this.plantName = plantName;
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}
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public String getLocation() {
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return location;
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}
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public void setLocation(String location) {
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this.location = location;
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}
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}

‎mapstruct-2/src/main/resources/object_to_list_cld.puml

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@startuml
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'https://plantuml.com/class-diagram
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hide empty attributes
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skinparam Handwritten false
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skinparam ClassBorderColor black
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skinparam BackgroundColor #fffce8/#f8f9fa
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skinparam class {
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ArrowColor SeaGreen
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BackgroundColor #fffce8
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}
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class Car {
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-make: String
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-model: String
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-year: int
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-seats: int
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-plant1: String
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-plant2: String
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-plant1Loc: String
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-plant2Loc: String
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__
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+Car(make: String, model: String, year: int, seats: int)
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__
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<i>Standard getter and setter methods
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}
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class CarDto {
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-make: String
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-model: String
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-year: int
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-numberOfseats: int
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-manufacturingPlantDtos:List<ManufacturingPlantDto>
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__
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+CarDto(make: String, model: String, year: int, numberOfSeats: int)
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__
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<i>Standard getter and setter methods
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}
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class ManufacturingPlantDto {
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-plantName: String
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-location: String
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__
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+ManufacturingPlantDto(plantName: String, location: String)
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__
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<i>Standard getter and setter methods
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}
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note left of Car
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Source object
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end note
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note left of CarDto
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Target object derived from Car
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end note
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note left of ManufacturingPlantDto::plantName
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possible values mapped to
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Car#plant1 and Car#plant2
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end note
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note left of ManufacturingPlantDto::location
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possible values mapped to
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Car#plant1Loc and Car#plant2Loc
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end note
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CarDto -down-> ManufacturingPlantDto: 1\n*
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Car .down. CarDto: 1\n1
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@enduml

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