eugenp · parthiv39731 · Jan 27, 2025 · Feb 1, 2025 · Feb 1, 2025 · Feb 1, 2025
diff --git a/mapstruct-2/pom.xml b/mapstruct-2/pom.xml
@@ -54,13 +54,15 @@
                             <version>${lombok.mapstruct.binding.version}</version>
                         </path>
                     </annotationProcessorPaths>
+                    <source>17</source>
+                    <target>17</target>
                 </configuration>
             </plugin>
         </plugins>
     </build>
 
     <properties>
-        <org.mapstruct.version>1.6.0.Beta2</org.mapstruct.version>
+        <org.mapstruct.version>1.6.3</org.mapstruct.version>
         <lombok.mapstruct.binding.version>0.2.0</lombok.mapstruct.binding.version>
     </properties>
 

diff --git a/mapstruct-2/src/main/java/com/baeldung/list/CarMapper.java b/mapstruct-2/src/main/java/com/baeldung/list/CarMapper.java
@@ -0,0 +1,28 @@
+package com.baeldung.list;
+
+import java.util.Arrays;
+
+import org.mapstruct.Mapper;
+import org.mapstruct.Mapping;
+import org.mapstruct.factory.Mappers;
+
+import com.baeldung.list.entity.Car;
+import com.baeldung.list.entity.CarDto;
+import com.baeldung.list.entity.ManufacturingPlantDto;
+
+@Mapper(imports = { Arrays.class, ManufacturingPlantDto.class })
+public interface CarMapper {
+    CarMapper INSTANCE = Mappers.getMapper(CarMapper.class);
+
+    @Mapping(target = "numberOfSeats", source = "seats")
+    @Mapping(
+        target = "manufacturingPlantDtos",
+        expression = """
+            java(Arrays.asList(
+            new ManufacturingPlantDto(car.getPlant1(), car.getPlant1Loc()),
+            new ManufacturingPlantDto(car.getPlant2(), car.getPlant2Loc())
+            ))
+        """
+    )
+    CarDto carToCarDto(Car car);
+}
diff --git a/mapstruct-2/src/main/java/com/baeldung/list/CarMapperDecorator.java b/mapstruct-2/src/main/java/com/baeldung/list/CarMapperDecorator.java
@@ -0,0 +1,38 @@
+package com.baeldung.list;
+
+import java.util.Arrays;
+import java.util.List;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.baeldung.list.entity.Car;
+import com.baeldung.list.entity.CarDto;
+import com.baeldung.list.entity.ManufacturingPlantDto;
+
+public abstract class CarMapperDecorator implements CustomCarMapper {
+    private final Logger logger = LoggerFactory.getLogger(CarMapperDecorator.class);
+    private CustomCarMapper delegate;
+
+    public CarMapperDecorator(CustomCarMapper delegate) {
+        this.delegate = delegate;
+    }
+
+    @Override
+    public CarDto carToCarDto(Car car) {
+        logger.info("calling Mapper decorator");
+        CarDto carDto = delegate.carToCarDto(car);
+
+        carDto.setManufacturingPlantDtos(getManufacturingPlantDtos(car));
+
+        return carDto;
+    }
+
+    private List<ManufacturingPlantDto> getManufacturingPlantDtos(Car car) {
+        // some custom logic or transformation which may require calls to other services
+        return Arrays.asList(
+            new ManufacturingPlantDto(car.getPlant1(), car.getPlant1Loc()),
+            new ManufacturingPlantDto(car.getPlant2(), car.getPlant2Loc())
+        );
+    }
+}
diff --git a/mapstruct-2/src/main/java/com/baeldung/list/CustomCarMapper.java b/mapstruct-2/src/main/java/com/baeldung/list/CustomCarMapper.java
@@ -0,0 +1,18 @@
+package com.baeldung.list;
+
+import org.mapstruct.DecoratedWith;
+import org.mapstruct.Mapper;
+import org.mapstruct.Mapping;
+import org.mapstruct.factory.Mappers;
+
+import com.baeldung.list.entity.Car;
+import com.baeldung.list.entity.CarDto;
+
+@Mapper
+@DecoratedWith(CarMapperDecorator.class)
+public interface CustomCarMapper {
+    CustomCarMapper INSTANCE = Mappers.getMapper(CustomCarMapper.class);
+
+    @Mapping(source = "seats", target = "numberOfSeats")
+    CarDto carToCarDto(Car car);
+}
diff --git a/mapstruct-2/src/main/java/com/baeldung/list/entity/Car.java b/mapstruct-2/src/main/java/com/baeldung/list/entity/Car.java
@@ -0,0 +1,72 @@
+package com.baeldung.list.entity;
+
+public class Car {
+    private String make;
+    private String model;
+    private int year;
+    private int seats;
+
+    private String plant1;
+    private String plant1Loc;
+    private String plant2;
+    private String plant2Loc;
+
+    public Car(String make, String model, int year, int seats) {
+        this.make = make;
+        this.model = model;
+        this.year = year;
+        this.seats = seats;
+    }
+
+    public String getPlant2() {
+        return plant2;
+    }
+
+    public void setPlant2(String plant2) {
+        this.plant2 = plant2;
+    }
+
+    public String getPlant2Loc() {
+        return plant2Loc;
+    }
+
+    public void setPlant2Loc(String plant2Loc) {
+        this.plant2Loc = plant2Loc;
+    }
+
+    public String getPlant1Loc() {
+        return plant1Loc;
+    }
+
+    public void setPlant1Loc(String plant1Loc) {
+        this.plant1Loc = plant1Loc;
+    }
+
+    public String getPlant1() {
+        return plant1;
+    }
+
+    public void setPlant1(String plant1) {
+        this.plant1 = plant1;
+    }
+
+    public int getSeats() {
+        return seats;
+    }
+
+    public void setSeats(int seats) {
+        this.seats = seats;
+    }
+
+    public String getMake() {
+        return make;
+    }
+
+    public String getModel() {
+        return model;
+    }
+
+    public int getYear() {
+        return year;
+    }
+}
diff --git a/mapstruct-2/src/main/java/com/baeldung/list/entity/CarDto.java b/mapstruct-2/src/main/java/com/baeldung/list/entity/CarDto.java
@@ -0,0 +1,60 @@
+package com.baeldung.list.entity;
+
+import java.util.List;
+
+public class CarDto {
+    private String make;
+    private String model;
+    private int year;
+    private int numberOfSeats;
+
+    private List<ManufacturingPlantDto> manufacturingPlantDtos;
+
+    public CarDto(String make, String model, int year, int numberOfSeats) {
+        this.make = make;
+        this.model = model;
+        this.year = year;
+        this.numberOfSeats = numberOfSeats;
+    }
+
+    public void setMake(String make) {
+        this.make = make;
+    }
+
+    public void setModel(String model) {
+        this.model = model;
+    }
+
+    public void setYear(int year) {
+        this.year = year;
+    }
+
+    public List<ManufacturingPlantDto> getManufacturingPlantDtos() {
+        return manufacturingPlantDtos;
+    }
+
+    public void setManufacturingPlantDtos(List<ManufacturingPlantDto> manufacturingPlantDtos) {
+        this.manufacturingPlantDtos = manufacturingPlantDtos;
+    }
+
+
+    public int getNumberOfSeats() {
+        return numberOfSeats;
+    }
+
+    public void setNumberOfSeats(int numberOfSeats) {
+        this.numberOfSeats = numberOfSeats;
+    }
+
+    public String getMake() {
+        return make;
+    }
+
+    public String getModel() {
+        return model;
+    }
+
+    public int getYear() {
+        return year;
+    }
+}
diff --git a/mapstruct-2/src/main/java/com/baeldung/list/entity/ManufacturingPlantDto.java b/mapstruct-2/src/main/java/com/baeldung/list/entity/ManufacturingPlantDto.java
@@ -0,0 +1,27 @@
+package com.baeldung.list.entity;
+
+public class ManufacturingPlantDto {
+    private String plantName;
+    private String location;
+
+    public ManufacturingPlantDto(String plantName, String location) {
+        this.plantName = plantName;
+        this.location = location;
+    }
+
+    public String getPlantName() {
+        return plantName;
+    }
+
+    public void setPlantName(String plantName) {
+        this.plantName = plantName;
+    }
+
+    public String getLocation() {
+        return location;
+    }
+
+    public void setLocation(String location) {
+        this.location = location;
+    }
+}
diff --git a/mapstruct-2/src/main/resources/puml/object_to_list_cld.puml b/mapstruct-2/src/main/resources/puml/object_to_list_cld.puml
@@ -0,0 +1,69 @@
+@startuml
+'https://plantuml.com/class-diagram
+hide empty attributes
+skinparam Handwritten false
+skinparam ClassBorderColor black
+skinparam BackgroundColor #fffce8/#f8f9fa
+skinparam class {
+ ArrowColor SeaGreen
+ BackgroundColor #fffce8
+}
+
+class Car {
+  -make: String
+  -model: String
+  -year: int
+  -seats: int
+  -plant1: String
+  -plant2: String
+  -plant1Loc: String
+  -plant2Loc: String
+  __
+  +Car(make: String, model: String, year: int, seats: int)
+  __
+  <i>Standard getter and setter methods
+}
+
+class CarDto {
+  -make: String
+  -model: String
+  -year: int
+  -numberOfseats: int
+  -manufacturingPlantDtos:List<ManufacturingPlantDto>
+  __
+  +CarDto(make: String, model: String, year: int, numberOfSeats: int)
+  __
+  <i>Standard getter and setter methods
+}
+
+
+
+class ManufacturingPlantDto {
+  -plantName: String
+  -location: String
+  __
+  +ManufacturingPlantDto(plantName: String, location: String)
+  __
+  <i>Standard getter and setter methods
+}
+
+note left of Car
+  Source object
+end note
+
+note left of CarDto
+  Target object derived from Car
+end note
+
+note left of ManufacturingPlantDto::plantName
+  possible values mapped to
+ Car#plant1 and Car#plant2
+end note
+note left of ManufacturingPlantDto::location
+   possible values mapped to
+ Car#plant1Loc and Car#plant2Loc
+end note
+
+CarDto -down-> ManufacturingPlantDto: 1\n*
+Car .down. CarDto: 1\n1
+@enduml