Mapstruct

1. How to map different field name:

package com.example.demo2.enums;

public enum Brand {
    MERCEDES,
    BMW,
    TOYOTA,
    FIAT
}
package com.example.demo2.entity;

import com.example.demo2.enums.Brand;
import jakarta.persistence.*;
import lombok.*;
import org.hibernate.Hibernate;

import java.util.Objects;

@Getter
@Setter
@ToString
@RequiredArgsConstructor
@Entity
public class Car {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    @Enumerated(value = EnumType.STRING)
    private Brand brand;
    private String model;

    @ToString.Exclude
    @OneToOne(mappedBy = "car", orphanRemoval = true)
    private Person person;

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || Hibernate.getClass(this) != Hibernate.getClass(o)) return false;
        Car car = (Car) o;
        return id != null && Objects.equals(id, car.id);
    }

    @Override
    public int hashCode() {
        return getClass().hashCode();
    }

} 


package com.example.demo2.dto;

import com.example.demo2.enums.Brand;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
public class CarDto {

    private Brand brand;
    private String modelName;
}
package com.example.demo2.mapper;

import com.example.demo2.dto.CarDto;
import com.example.demo2.entity.Car;
import org.mapstruct.Mapper;
import org.mapstruct.Mapping;
import org.mapstruct.ReportingPolicy;

@Mapper(componentModel = "spring", unmappedTargetPolicy = ReportingPolicy.IGNORE)
public interface CarMapper {

    @Mapping(target = "model", source = "modelName")
    Car toEntity(CarDto dto);

    @Mapping(target = "modelName", source = "model")
    CarDto toDto(Car car);
}


2. Multiple sources mapping:

package com.example.demo2.entity;

import lombok.Data;

@Data
public class A {
    private String one;
    private String two;
}
package com.example.demo2.entity;

import lombok.Data;

@Data
public class B {
    private String three;
    private String four;
}
package com.example.demo2.dto;

import lombok.Data;

@Data
public class ABDto {
    private String one;
    private String two;
    private String three;
    private String four;
}


package com.example.demo2.mapper;

import com.example.demo2.dto.ABDto;
import com.example.demo2.entity.A;
import com.example.demo2.entity.B;
import org.mapstruct.Mapper;
import org.mapstruct.Mapping;
import org.mapstruct.ReportingPolicy;

@Mapper(componentModel = "spring", unmappedTargetPolicy = ReportingPolicy.IGNORE)
public interface ABMapper {

    @Mapping(source = "a.onee", target = "one")
    ABDto toABDto(A a, B b);

    @Mapping(source = "dto.one", target = "onee")
    A toA(ABDto dto);

    B toB(ABDto dto);
}


3. Nested bean properties mapping:

package com.example.demo2.entity;

import jakarta.persistence.*;
import lombok.*;
import org.hibernate.Hibernate;

import java.util.Objects;

@Getter
@Setter
@ToString
@RequiredArgsConstructor
@Entity
public class Person {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String name;
    private String surname;

    @OneToOne(cascade = CascadeType.ALL, orphanRemoval = true)
    @JoinColumn(name = "car_id")
    private Car car;

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || Hibernate.getClass(this) != Hibernate.getClass(o)) return false;
        Person person = (Person) o;
        return id != null && Objects.equals(id, person.id);
    }

    @Override
    public int hashCode() {
        return getClass().hashCode();
    }
}


package com.example.demo2.entity;

import com.example.demo2.enums.Brand;
import jakarta.persistence.*;
import lombok.*;
import org.hibernate.Hibernate;

import java.util.Objects;

@Getter
@Setter
@ToString
@RequiredArgsConstructor
@Entity
public class Car {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    @Enumerated(value = EnumType.STRING)
    private Brand brand;
    private String model;

    @ToString.Exclude
    @OneToOne(mappedBy = "car", orphanRemoval = true)
    private Person person;

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || Hibernate.getClass(this) != Hibernate.getClass(o)) return false;
        Car car = (Car) o;
        return id != null && Objects.equals(id, car.id);
    }

    @Override
    public int hashCode() {
        return getClass().hashCode();
    }
}


package com.example.demo2.dto;

import com.example.demo2.enums.Brand;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
public class CarDto {

    private Brand brand;
    private String model;
}


package com.example.demo2.dto;

import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
public class PersonDto {

    private String name;
    private String surname;
    private CarDto carDto;
}


package com.example.demo2.mapper;

import com.example.demo2.dto.PersonDto;
import com.example.demo2.entity.Person;
import org.mapstruct.Mapper;
import org.mapstruct.Mapping;
import org.mapstruct.Mappings;
import org.mapstruct.ReportingPolicy;

@Mapper(componentModel = "spring", unmappedTargetPolicy = ReportingPolicy.IGNORE)
public interface PersonMapper {


    @Mappings({
            @Mapping(source = "dto.carDto.brand", target = "car.brand"),
            @Mapping(source = "dto.carDto.model", target = "car.model")
    })
    Person dtoToEntity(PersonDto dto);

    @Mappings({
            @Mapping(source = "person.car.brand", target = "carDto.brand"),
            @Mapping(source = "person.car.model", target = "carDto.model")
    })
    PersonDto entityToDto(Person person);
}


4. Custom mapping:

package com.example.demo2.entity;

import lombok.Data;

@Data
public class Cars {
    private String regNumber;
    private String modelNumber;
    private String company;
    private Driver driver;
}
package com.example.demo2.entity;

import lombok.Data;

@Data
public class Driver {
    private String name;
    private Integer expiresIn;
}
package com.example.demo2.dto;

import com.example.demo2.entity.Driver;
import lombok.Data;

@Data
public class CarsDto {
    private String regNumber;
    private String modelNumber;
    private String company;
    private DriverDto driverDto;
}
package com.example.demo2.dto;

import lombok.Data;

@Data
public class DriverDto {
    private String name;
    private Integer expiresIn;
}
package com.example.demo2.mapper;

import com.example.demo2.dto.CarsDto;
import com.example.demo2.dto.DriverDto;
import com.example.demo2.entity.Cars;
import com.example.demo2.entity.Driver;
import org.mapstruct.Mapper;
import org.mapstruct.Mapping;
import org.mapstruct.Named;

@Mapper(componentModel = "spring")
public abstract class CarDriverMapper {

    @Mapping(target = "driverDto", source = "cars.driver", qualifiedByName = "driverToDriverDto")
    public abstract CarsDto toCarDto(Cars cars);

    @Named(value = "driverToDriverDto")
    public DriverDto driverToDriverDto(Driver driver) {
        DriverDto dto = new DriverDto();
        dto.setName(driver.getName());
        dto.setExpiresIn(driver.getExpiresIn());
        return dto;
    }
}

veya

package com.example.demo2.mapper;

import com.example.demo2.dto.CarsDto;
import com.example.demo2.dto.DriverDto;
import com.example.demo2.entity.Cars;
import com.example.demo2.entity.Driver;
import org.mapstruct.Mapper;
import org.mapstruct.Mapping;
import org.mapstruct.Named;

@Mapper(componentModel = "spring")
public interface CarDriverMapper {

    @Mapping(target = "driverDto", source = "cars.driver", qualifiedByName = "driverToDriverDto")
    CarsDto toCarDto(Cars cars);

    @Named(value = "driverToDriverDto")
    default DriverDto driverToDriverDto(Driver driver) {
        DriverDto dto = new DriverDto();
        dto.setName(driver.getName());
        dto.setExpiresIn(driver.getExpiresIn());
        return dto;
    }
}


































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