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arpendu11Arpendu Kumar Garai
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Arpendu Kumar Garai
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mapstruct guide (thombergs#192)
Co-authored-by: Arpendu Kumar Garai <[email protected]>
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‎mapstruct/README.md‎

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# Related Blog Posts
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* [One-Stop Guide to Mapping with MapStruct](https://reflectoring.io/one-stop-guide-mapstruct/)
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‎mapstruct/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>io.reflectoring</groupId>
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<artifactId>mapstruct</artifactId>
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<version>1.0-SNAPSHOT</version>
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<properties>
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<org.mapstruct.version>1.4.2.Final</org.mapstruct.version>
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<org.projectlombok.version>1.18.24</org.projectlombok.version>
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<maven.compiler.source>8</maven.compiler.source>
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<maven.compiler.target>8</maven.compiler.target>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.mapstruct</groupId>
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<artifactId>mapstruct</artifactId>
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<version>${org.mapstruct.version}</version>
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</dependency>
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<dependency>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok</artifactId>
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<version>${org.projectlombok.version}</version>
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<scope>provided</scope>
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</dependency>
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<dependency>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-api</artifactId>
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<version>1.7.36</version>
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</dependency>
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<dependency>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-log4j12</artifactId>
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<version>1.7.36</version>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>3.8.1</version>
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<configuration>
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<source>1.8</source>
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<target>1.8</target>
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<annotationProcessorPaths>
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<path>
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<groupId>org.mapstruct</groupId>
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<artifactId>mapstruct-processor</artifactId>
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<version>${org.mapstruct.version}</version>
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</path>
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<path>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok</artifactId>
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<version>${org.projectlombok.version}</version>
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</path>
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<!-- additional annotation processor required as of Lombok 1.18.16 -->
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<path>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok-mapstruct-binding</artifactId>
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<version>0.2.0</version>
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</path>
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</annotationProcessorPaths>
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<!-- due to problem in maven-compiler-plugin, for verbose mode add showWarnings -->
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<showWarnings>true</showWarnings>
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<compilerArgs>
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<arg>
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-Amapstruct.suppressGeneratorTimestamp=true
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</arg>
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<arg>
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-Amapstruct.suppressGeneratorVersionInfoComment=true
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</arg>
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<arg>
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-Amapstruct.verbose=true
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</arg>
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<arg>
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-Amapstruct.defaultComponentModel=default
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</arg>
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</compilerArgs>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>

‎mapstruct/src/main/java/io/reflectoring/MappingGuide.java‎

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package io.reflectoring;
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import io.reflectoring.dto.BasicUserDTO;
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import io.reflectoring.dto.EducationDTO;
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import io.reflectoring.dto.PersonDTO;
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import io.reflectoring.mappers.CollectionMapper;
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import io.reflectoring.mappers.UserMapper;
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import io.reflectoring.model.*;
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import lombok.extern.slf4j.Slf4j;
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import java.util.*;
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import java.util.stream.Stream;
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@Slf4j
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public class MappingGuide {
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public static void main(String[] args) {
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log.info("MapStruct Mapping conversion started !!");
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Manager manager = Manager
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.builder()
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.id(2)
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.name("Adam Smith")
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.build();
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BasicUser user = BasicUser
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.builder()
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.id(1)
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.name("John Doe")
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.managerList(Collections.singletonList(manager))
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.build();
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log.info("User details: {}", user);
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BasicUserDTO dto = UserMapper.INSTANCE.convert(user);
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log.info("UserDTO details: {}", dto);
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BasicUser anotherUser = UserMapper.INSTANCE.convert(dto);
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log.info("User details: {}", anotherUser);
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Education education = Education
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.builder()
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.degreeName("M.S.")
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.institute("Carnegie Mellon University")
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.yearOfPassing(2021)
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.build();
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Address address = Address
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.builder()
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.houseNo("25A")
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.landmark("Decker's lane")
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.city("New York")
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.country("USA")
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.zipcode("10001")
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.build();
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Employment employment = Employment
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.builder()
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.designation(DesignationCode.CEO)
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.salary(300000L)
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.build();
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PersonDTO personDTO = UserMapper.INSTANCE.convert(user, education, address, employment);
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UserMapper.INSTANCE.updateExisting(user, education, address, employment, personDTO);
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log.info("PersonDTO details: {}", personDTO);
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Set<Long> ids = new HashSet<>(Arrays.asList(100000L, 100001L, 100002L));
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Set<String> set = CollectionMapper.INSTANCE.convert(ids);
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Set<String> streamSet = CollectionMapper.INSTANCE.convertStream(ids.parallelStream());
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log.info("Set of String: {}", set);
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log.info("Set of String from Streams: {}", streamSet);
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List<EducationDTO> educationDTO = CollectionMapper.INSTANCE.convert(Collections.singletonList(education));
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List<EducationDTO> educationDTOFromStream = CollectionMapper.INSTANCE.convert(Stream.of(education));
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log.info("List of Education: {}", educationDTO);
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log.info("List of Education from Stream: {}", educationDTOFromStream);
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Map<Long, Date> dateMap = new HashMap<>();
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dateMap.put(100000L, new Date());
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dateMap.put(100001L, new Date());
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Map<String, String> map = CollectionMapper.INSTANCE.map(dateMap);
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log.info("Map of dates: {}", map);
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log.info("MapStruct Mapping conversion completed !!");
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}
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}

‎mapstruct/src/main/java/io/reflectoring/decorators/UserMapperDecorator.java‎

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package io.reflectoring.decorators;
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import io.reflectoring.dto.PersonDTO;
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import io.reflectoring.mappers.UserMapper;
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import io.reflectoring.model.Address;
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import io.reflectoring.model.BasicUser;
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import io.reflectoring.model.Education;
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import io.reflectoring.model.Employment;
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public abstract class UserMapperDecorator implements UserMapper {
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private final UserMapper delegate;
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protected UserMapperDecorator (UserMapper delegate) {
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this.delegate = delegate;
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}
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@Override
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public PersonDTO convert(BasicUser user, Education education, Address address, Employment employment) {
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PersonDTO dto = delegate.convert(user, education, address, employment);
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if (user.getName().split("\\w+").length > 1) {
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dto.setFirstName(user.getName().substring(0, user.getName().lastIndexOf(' ')));
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dto.setLastName(user.getName().substring(user.getName().lastIndexOf(" ") + 1));
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}
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else {
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dto.setFirstName(user.getName());
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}
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return dto;
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}
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}

‎mapstruct/src/main/java/io/reflectoring/dto/BasicUserDTO.java‎

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package io.reflectoring.dto;
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import lombok.*;
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@Data
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@Builder
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@ToString
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public class BasicUserDTO {
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private String id;
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private String name;
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}

‎mapstruct/src/main/java/io/reflectoring/dto/DegreeStreamPrefix.java‎

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package io.reflectoring.dto;
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public enum DegreeStreamPrefix {
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MSC_MATHS,
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MSC_PHYSICS,
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MSC_CHEMISTRY,
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MSC_BOTANY,
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MSC_ZOOLOGY,
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MSC_STATISTICS,
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MSC_EDUCATION
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}

‎mapstruct/src/main/java/io/reflectoring/dto/DesignationConstant.java‎

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package io.reflectoring.dto;
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public enum DesignationConstant {
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CHIEF_EXECUTIVE_OFFICER,
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CHIEF_TECHNICAL_OFFICER,
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VICE_PRESIDENT,
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SENIOR_MANAGER,
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MANAGER,
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ARCHITECT,
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SENIOR_SOFTWARE_ENGINEER,
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SOFTWARE_ENGINEER,
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INTERN,
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OTHERS
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}

‎mapstruct/src/main/java/io/reflectoring/dto/EducationDTO.java‎

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package io.reflectoring.dto;
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import lombok.Builder;
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import lombok.Data;
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import lombok.ToString;
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@Data
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@Builder
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@ToString
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public class EducationDTO {
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private String degree;
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private String college;
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private Integer passingYear;
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}

‎mapstruct/src/main/java/io/reflectoring/dto/EmploymentDTO.java‎

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package io.reflectoring.dto;
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import lombok.Builder;
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import lombok.Data;
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import lombok.ToString;
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@Data
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@Builder
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@ToString
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public class EmploymentDTO {
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private String designation;
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private long salary;
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}

‎mapstruct/src/main/java/io/reflectoring/dto/ManagerDTO.java‎

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package io.reflectoring.dto;
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import lombok.Builder;
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import lombok.Data;
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import lombok.ToString;
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import java.util.Date;
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@Data
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@Builder
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@ToString
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public class ManagerDTO {
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private int id;
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private String name;
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private Date dateOfBirth;
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}

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