My Initial Commit

.gitignore

+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/

.mvn/wrapper/maven-wrapper.properties

+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.8.7/apache-maven-3.8.7-bin.zip
+wrapperUrl=https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.1/maven-wrapper-3.1.1.jar

mvnw.cmd

+@REM ----------------------------------------------------------------------------
+@REM Licensed to the Apache Software Foundation (ASF) under one
+@REM or more contributor license agreements.  See the NOTICE file
+@REM distributed with this work for additional information
+@REM regarding copyright ownership.  The ASF licenses this file
+@REM to you under the Apache License, Version 2.0 (the
+@REM "License"); you may not use this file except in compliance
+@REM with the License.  You may obtain a copy of the License at
+@REM
+@REM    https://www.apache.org/licenses/LICENSE-2.0
+@REM
+@REM Unless required by applicable law or agreed to in writing,
+@REM software distributed under the License is distributed on an
+@REM "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+@REM KIND, either express or implied.  See the License for the
+@REM specific language governing permissions and limitations
+@REM under the License.
+@REM ----------------------------------------------------------------------------
+
+@REM ----------------------------------------------------------------------------
+@REM Maven Start Up Batch script
+@REM
+@REM Required ENV vars:
+@REM JAVA_HOME - location of a JDK home dir
+@REM
+@REM Optional ENV vars
+@REM M2_HOME - location of maven2's installed home dir
+@REM MAVEN_BATCH_ECHO - set to 'on' to enable the echoing of the batch commands
+@REM MAVEN_BATCH_PAUSE - set to 'on' to wait for a keystroke before ending
+@REM MAVEN_OPTS - parameters passed to the Java VM when running Maven
+@REM     e.g. to debug Maven itself, use
+@REM set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+@REM MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+@REM ----------------------------------------------------------------------------
+
+@REM Begin all REM lines with '@' in case MAVEN_BATCH_ECHO is 'on'
+@echo off
+@REM set title of command window
+title %0
+@REM enable echoing by setting MAVEN_BATCH_ECHO to 'on'
+@if "%MAVEN_BATCH_ECHO%" == "on"  echo %MAVEN_BATCH_ECHO%
+
+@REM set %HOME% to equivalent of $HOME
+if "%HOME%" == "" (set "HOME=%HOMEDRIVE%%HOMEPATH%")
+
+@REM Execute a user defined script before this one
+if not "%MAVEN_SKIP_RC%" == "" goto skipRcPre
+@REM check for pre script, once with legacy .bat ending and once with .cmd ending
+if exist "%USERPROFILE%\mavenrc_pre.bat" call "%USERPROFILE%\mavenrc_pre.bat" %*
+if exist "%USERPROFILE%\mavenrc_pre.cmd" call "%USERPROFILE%\mavenrc_pre.cmd" %*
+:skipRcPre
+
+@setlocal
+
+set ERROR_CODE=0
+
+@REM To isolate internal variables from possible post scripts, we use another setlocal
+@setlocal
+
+@REM ==== START VALIDATION ====
+if not "%JAVA_HOME%" == "" goto OkJHome
+
+echo.
+echo Error: JAVA_HOME not found in your environment. >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+:OkJHome
+if exist "%JAVA_HOME%\bin\java.exe" goto init
+
+echo.
+echo Error: JAVA_HOME is set to an invalid directory. >&2
+echo JAVA_HOME = "%JAVA_HOME%" >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+@REM ==== END VALIDATION ====
+
+:init
+
+@REM Find the project base dir, i.e. the directory that contains the folder ".mvn".
+@REM Fallback to current working directory if not found.
+
+set MAVEN_PROJECTBASEDIR=%MAVEN_BASEDIR%
+IF NOT "%MAVEN_PROJECTBASEDIR%"=="" goto endDetectBaseDir
+
+set EXEC_DIR=%CD%
+set WDIR=%EXEC_DIR%
+:findBaseDir
+IF EXIST "%WDIR%"\.mvn goto baseDirFound
+cd ..
+IF "%WDIR%"=="%CD%" goto baseDirNotFound
+set WDIR=%CD%
+goto findBaseDir
+
+:baseDirFound
+set MAVEN_PROJECTBASEDIR=%WDIR%
+cd "%EXEC_DIR%"
+goto endDetectBaseDir
+
+:baseDirNotFound
+set MAVEN_PROJECTBASEDIR=%EXEC_DIR%
+cd "%EXEC_DIR%"
+
+:endDetectBaseDir
+
+IF NOT EXIST "%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config" goto endReadAdditionalConfig
+
+@setlocal EnableExtensions EnableDelayedExpansion
+for /F "usebackq delims=" %%a in ("%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config") do set JVM_CONFIG_MAVEN_PROPS=!JVM_CONFIG_MAVEN_PROPS! %%a
+@endlocal & set JVM_CONFIG_MAVEN_PROPS=%JVM_CONFIG_MAVEN_PROPS%
+
+:endReadAdditionalConfig
+
+SET MAVEN_JAVA_EXE="%JAVA_HOME%\bin\java.exe"
+set WRAPPER_JAR="%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.jar"
+set WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+set DOWNLOAD_URL="https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar"
+
+FOR /F "usebackq tokens=1,2 delims==" %%A IN ("%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.properties") DO (
+    IF "%%A"=="wrapperUrl" SET DOWNLOAD_URL=%%B
+)
+
+@REM Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
+@REM This allows using the maven wrapper in projects that prohibit checking in binary data.
+if exist %WRAPPER_JAR% (
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Found %WRAPPER_JAR%
+    )
+) else (
+    if not "%MVNW_REPOURL%" == "" (
+        SET DOWNLOAD_URL="%MVNW_REPOURL%/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar"
+    )
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Couldn't find %WRAPPER_JAR%, downloading it ...
+        echo Downloading from: %DOWNLOAD_URL%
+    )
+
+    powershell -Command "&{"^
+		"$webclient = new-object System.Net.WebClient;"^
+		"if (-not ([string]::IsNullOrEmpty('%MVNW_USERNAME%') -and [string]::IsNullOrEmpty('%MVNW_PASSWORD%'))) {"^
+		"$webclient.Credentials = new-object System.Net.NetworkCredential('%MVNW_USERNAME%', '%MVNW_PASSWORD%');"^
+		"}"^
+		"[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; $webclient.DownloadFile('%DOWNLOAD_URL%', '%WRAPPER_JAR%')"^
+		"}"
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Finished downloading %WRAPPER_JAR%
+    )
+)
+@REM End of extension
+
+@REM Provide a "standardized" way to retrieve the CLI args that will
+@REM work with both Windows and non-Windows executions.
+set MAVEN_CMD_LINE_ARGS=%*
+
+%MAVEN_JAVA_EXE% ^
+  %JVM_CONFIG_MAVEN_PROPS% ^
+  %MAVEN_OPTS% ^
+  %MAVEN_DEBUG_OPTS% ^
+  -classpath %WRAPPER_JAR% ^
+  "-Dmaven.multiModuleProjectDirectory=%MAVEN_PROJECTBASEDIR%" ^
+  %WRAPPER_LAUNCHER% %MAVEN_CONFIG% %*
+if ERRORLEVEL 1 goto error
+goto end
+
+:error
+set ERROR_CODE=1
+
+:end
+@endlocal & set ERROR_CODE=%ERROR_CODE%
+
+if not "%MAVEN_SKIP_RC%"=="" goto skipRcPost
+@REM check for post script, once with legacy .bat ending and once with .cmd ending
+if exist "%USERPROFILE%\mavenrc_post.bat" call "%USERPROFILE%\mavenrc_post.bat"
+if exist "%USERPROFILE%\mavenrc_post.cmd" call "%USERPROFILE%\mavenrc_post.cmd"
+:skipRcPost
+
+@REM pause the script if MAVEN_BATCH_PAUSE is set to 'on'
+if "%MAVEN_BATCH_PAUSE%"=="on" pause
+
+if "%MAVEN_TERMINATE_CMD%"=="on" exit %ERROR_CODE%
+
+cmd /C exit /B %ERROR_CODE%

pom.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<parent>
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-starter-parent</artifactId>
+		<version>2.7.10</version>
+		<relativePath/> <!-- lookup parent from repository -->
+	</parent>
+	<groupId>com.example.nisum</groupId>
+	<artifactId>MapStruct</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<name>MapStruct</name>
+	<description>Demo project for Spring Boot+ Map Struct</description>
+	<properties>
+		<java.version>1.8</java.version>
+		<org.mapstruct.version>1.4.2.Final</org.mapstruct.version>
+		<org.projectlombok.version>1.18.24</org.projectlombok.version>
+	</properties>
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-web</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.mapstruct</groupId>
+			<artifactId>mapstruct</artifactId>
+			<version>${org.mapstruct.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>org.projectlombok</groupId>
+			<artifactId>lombok</artifactId>
+			<version>${org.projectlombok.version}</version>
+			<scope>provided</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-compiler-plugin</artifactId>
+				<version>3.8.1</version>
+				<configuration>
+					<source>1.8</source>
+					<target>1.8</target>
+					<annotationProcessorPaths>
+						<path>
+							<groupId>org.mapstruct</groupId>
+							<artifactId>mapstruct-processor</artifactId>
+							<version>${org.mapstruct.version}</version>
+						</path>
+						<path>
+							<groupId>org.projectlombok</groupId>
+							<artifactId>lombok</artifactId>
+							<version>${org.projectlombok.version}</version>
+						</path>
+						<!-- additional annotation processor required as of Lombok 1.18.16 -->
+						<path>
+							<groupId>org.projectlombok</groupId>
+							<artifactId>lombok-mapstruct-binding</artifactId>
+							<version>0.2.0</version>
+						</path>
+					</annotationProcessorPaths>
+				</configuration>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>

src/main/java/com/example/nisum/MapStruct/MapStructApplication.java

+package com.example.nisum.MapStruct;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class MapStructApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(MapStructApplication.class, args);
+	}
+
+}

src/main/java/com/example/nisum/MapStruct/dto/BasicUserDto.java

+package com.example.nisum.MapStruct.dto;
+
+import lombok.Builder;
+import lombok.Data;
+import lombok.ToString;
+
+@Data
+@Builder
+@ToString
+public class BasicUserDto {
+
+    private int id;
+    private String name;
+
+}

src/main/java/com/example/nisum/MapStruct/dto/EducationDTO.java

+package com.example.nisum.MapStruct.dto;
+
+import lombok.Builder;
+import lombok.Data;
+import lombok.ToString;
+
+@Data
+@Builder
+@ToString
+public class EducationDTO {
+    private String degree;
+    private String college;
+    private Integer passingYear;
+}
\ No newline at end of file

src/main/java/com/example/nisum/MapStruct/dto/EmploymentDTO.java

+package com.example.nisum.MapStruct.dto;
+
+import lombok.Builder;
+import lombok.Data;
+import lombok.ToString;
+
+@Data
+@Builder
+@ToString
+public class EmploymentDTO {
+
+    private String deptName;
+    private String deptId;
+    private String orgName;
+}

src/main/java/com/example/nisum/MapStruct/dto/ManagerDTO.java

+package com.example.nisum.MapStruct.dto;
+
+import lombok.Builder;
+import lombok.Data;
+import lombok.ToString;
+
+@Data
+@Builder
+@ToString
+public class ManagerDTO {
+    private int id;
+    private String name;
+}
\ No newline at end of file

src/main/java/com/example/nisum/MapStruct/dto/PersonDTO.java

+package com.example.nisum.MapStruct.dto;
+
+import lombok.Builder;
+import lombok.Data;
+import lombok.ToString;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@Data
+@Builder
+@ToString
+public class PersonDTO {
+
+    private String id;
+    private String firstName;
+    private String lastName;
+    private String educationalQualification;
+    private String residentialCity;
+    private String residentialCountry;
+    private String designation;
+    private long salary;
+    private EducationDTO education;
+    private List<ManagerDTO> managerList;
+    private List<EmploymentDTO> employmentDTOS;
+
+    public List<ManagerDTO> getManagerList() {
+        return managerList;
+    }
+
+    public void setManagerList(List<ManagerDTO> managers) {
+        this.managerList = managers;
+    }
+
+    public void addManagerList(ManagerDTO managerDTO) {
+        if (managerList == null) {
+            managerList = new ArrayList<>();
+        }
+
+        managerList.add(managerDTO);
+    }
+
+}

src/main/java/com/example/nisum/MapStruct/enums/DegreeStream.java

+package com.example.nisum.MapStruct.enums;
+
+public enum DegreeStream {
+  MATHS,
+  PHYSICS,
+  CHEMISTRY,
+  BOTANY,
+  ZOOLOGY,
+  STATISTICS,
+  EDUCATION
+}
\ No newline at end of file

src/main/java/com/example/nisum/MapStruct/enums/DegreeStreamPrefix.java

+package com.example.nisum.MapStruct.enums;
+
+public enum DegreeStreamPrefix {
+  MSC_MATHS,
+  MSC_PHYSICS,
+  MSC_CHEMISTRY,
+  MSC_BOTANY,
+  MSC_ZOOLOGY,
+  MSC_STATISTICS,
+  MSC_EDUCATION
+}
\ No newline at end of file

src/main/java/com/example/nisum/MapStruct/enums/DesignationCode.java

+package com.example.nisum.MapStruct.enums;
+
+public enum DesignationCode {
+    CEO,
+    CTO,
+    VP,
+    SM,
+    M,
+    ARCH,
+    SSE,
+    SE,
+    INT
+}
\ No newline at end of file

src/main/java/com/example/nisum/MapStruct/enums/DesignationConstant.java

+package com.example.nisum.MapStruct.enums;
+
+public enum DesignationConstant {
+    CHIEF_EXECUTIVE_OFFICER,
+    CHIEF_TECHNICAL_OFFICER,
+    VICE_PRESIDENT,
+    SENIOR_MANAGER,
+    MANAGER,
+    ARCHITECT,
+    SENIOR_SOFTWARE_ENGINEER,
+    SOFTWARE_ENGINEER,
+    INTERN,
+    OTHERS
+}
\ No newline at end of file

src/main/java/com/example/nisum/MapStruct/exception/Validator.java

+package com.example.nisum.MapStruct.exception;
+
+import javax.xml.bind.ValidationException;
+
+public class Validator {
+
+    public int validateId(int id) throws ValidationException {
+        if (id < 0) {
+            throw new ValidationException("Invalid ID value");
+        }
+        return id;
+    }
+}

src/main/java/com/example/nisum/MapStruct/exception/ValidatorException.java

+package com.example.nisum.MapStruct.exception;
+
+public class ValidatorException extends RuntimeException {
+
+    public ValidatorException(String message) {
+        super(message);
+    }
+
+    public ValidatorException(String message, Throwable throwable) {
+        super(message, throwable);
+    }
+}

src/main/java/com/example/nisum/MapStruct/mapper/BasicMapper.java

+package com.example.nisum.MapStruct.mapper;
+
+import com.example.nisum.MapStruct.exception.Validator;
+import com.example.nisum.MapStruct.exception.ValidatorException;
+import com.example.nisum.MapStruct.model.Address;
+import com.example.nisum.MapStruct.dto.BasicUserDto;
+import com.example.nisum.MapStruct.model.Education;
+import com.example.nisum.MapStruct.dto.PersonDTO;
+import com.example.nisum.MapStruct.model.BasicUser;
+import com.example.nisum.MapStruct.model.Employment;
+import org.mapstruct.InheritInverseConfiguration;
+import org.mapstruct.Mapper;
+import org.mapstruct.Mapping;
+import org.mapstruct.Mappings;
+import org.mapstruct.factory.Mappers;
+
+@Mapper(uses = {ManagerMapper.class, EmploymentMapper.class, Validator.class})
+public interface BasicMapper {
+
+    BasicMapper INSTANCE = Mappers.getMapper(BasicMapper.class);
+
+    //Same fields Mappings
+
+    //Exception Handling during Mapping
+    BasicUserDto convert(BasicUser user) throws ValidatorException;
+
+    //Inverse Mappings
+    @InheritInverseConfiguration
+    BasicUser convert(BasicUserDto basicUserDto) throws ValidatorException;
+
+    //Custom Mapping Methods
+    default PersonDTO convertCustom(BasicUser basicUser) {
+        return PersonDTO.builder().id(String.valueOf(basicUser.getId()))
+                .firstName(basicUser.getName().substring(0, basicUser.getName().indexOf(" ")))
+                .lastName(basicUser.getName().substring(basicUser.getName().indexOf(" ") + 1))
+                .build();
+    }
+
+    //Mapping from Several Source Objects
+    @Mappings({
+            @Mapping(source = "basicUser.id", target = "id"),
+            @Mapping(source = "basicUser.name", target = "firstName"),
+            @Mapping(source = "education.degreeName", target = "educationalQualification"),
+            @Mapping(source = "address.city", target = "residentialCity"),
+            @Mapping(source = "address.country", target = "residentialCountry")
+    })
+    PersonDTO convert(BasicUser basicUser, Education education, Address address);
+
+    //Mapping Nested Objects
+   /* @Mappings({
+            @Mapping(source = "basicUser.id", target = "id"),
+            @Mapping(source = "basicUser.name", target = "firstName"),
+            @Mapping(source = "education.degreeName", target = "educationalQualification"),
+            @Mapping(source = "address.city", target = "residentialCity"),
+            @Mapping(source = "address.country", target = "residentialCountry")
+    })
+    PersonDTO convert(BasicUser basicUser, Education education, Address address, Employment employment);*/
+
+    @Mappings({
+            @Mapping(source = "basicUser.id", target = "id"),
+            @Mapping(source = "basicUser.name", target = "firstName"),
+            @Mapping(source = "education.degreeName", target = "educationalQualification"),
+            @Mapping(source = "address.city", target = "residentialCity"),
+            @Mapping(source = "address.country", target = "residentialCountry"),
+            @Mapping(source = "employment", target = ".")
+    })
+    PersonDTO convert(BasicUser basicUser, Education education, Address address, Employment employment);
+
+}

src/main/java/com/example/nisum/MapStruct/mapper/CollectionMapper.java

+package com.example.nisum.MapStruct.mapper;
+
+import com.example.nisum.MapStruct.dto.EducationDTO;
+import com.example.nisum.MapStruct.dto.EmploymentDTO;
+import com.example.nisum.MapStruct.model.Education;
+import com.example.nisum.MapStruct.model.Employment;
+import org.mapstruct.MapMapping;
+import org.mapstruct.Mapper;
+import org.mapstruct.Mapping;
+import org.mapstruct.Mappings;
+import org.mapstruct.factory.Mappers;
+
+import java.util.Date;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.stream.Stream;
+
+@Mapper
+public interface CollectionMapper {
+
+    CollectionMapper INSTANCE = Mappers.getMapper(CollectionMapper.class);
+
+    Set<String> convert(Set<Long> ids);
+
+    //no need to declare
+    Set<EmploymentDTO> convertEmployment(Set<Employment> employmentSet);
+
+    //We have declare manually for List and stream
+    @Mappings({
+            @Mapping(source = "education.degreeName", target = "degree"),
+            @Mapping(source = "education.institute", target = "college"),
+            @Mapping(source = "education.yearOfPassing", target = "passingYear")
+    })
+    EducationDTO convertEducation(Education education);
+
+    List<EducationDTO> convertEducation(List<Education> education);
+
+    //Map
+    @MapMapping(keyNumberFormat = "#L", valueDateFormat = "dd.MM.yyyy")
+    Map<String, String> map(Map<Long, Date> dateMap);
+
+    //Stream
+    List<EducationDTO> convertEducation(Stream<Education> educationStream);
+
+}

src/main/java/com/example/nisum/MapStruct/mapper/EmploymentMapper.java

+package com.example.nisum.MapStruct.mapper;
+
+import com.example.nisum.MapStruct.dto.EmploymentDTO;
+import com.example.nisum.MapStruct.model.Employment;
+import org.mapstruct.Mapper;
+import org.mapstruct.factory.Mappers;
+
+@Mapper
+public interface EmploymentMapper {
+
+    EmploymentMapper INSTANCE = Mappers.getMapper(EmploymentMapper.class);
+
+    EmploymentDTO convert(Employment employment);
+}

src/main/java/com/example/nisum/MapStruct/mapper/EnumMapper.java

+package com.example.nisum.MapStruct.mapper;
+
+import com.example.nisum.MapStruct.enums.DegreeStream;
+import com.example.nisum.MapStruct.enums.DegreeStreamPrefix;
+import com.example.nisum.MapStruct.enums.DesignationCode;
+import com.example.nisum.MapStruct.enums.DesignationConstant;
+import org.mapstruct.*;
+import org.mapstruct.factory.Mappers;
+
+@Mapper
+public interface EnumMapper {
+
+    EnumMapper enumMapper = Mappers.getMapper(EnumMapper.class);
+
+    @ValueMappings({
+            @ValueMapping(source = "CEO", target = "CHIEF_EXECUTIVE_OFFICER"),
+            @ValueMapping(source = "CTO", target = "CHIEF_TECHNICAL_OFFICER"),
+            @ValueMapping(source = "VP", target = "VICE_PRESIDENT"),
+            @ValueMapping(source = "SM", target = "SENIOR_MANAGER"),
+            @ValueMapping(source = "M", target = "MANAGER"),
+            @ValueMapping(source = "ARCH", target = "ARCHITECT"),
+            @ValueMapping(source = "SSE", target = "SENIOR_SOFTWARE_ENGINEER"),
+            @ValueMapping(source = "SE", target = "SOFTWARE_ENGINEER"),
+            @ValueMapping(source = "INT", target = "INTERN"),
+            @ValueMapping(source = MappingConstants.ANY_REMAINING, target = "OTHERS"),
+            @ValueMapping(source = MappingConstants.NULL, target = "OTHERS")
+    })
+    DesignationConstant convert(DesignationCode code);
+
+    @EnumMapping(nameTransformationStrategy = "prefix", configuration = "MSC_")
+    DegreeStreamPrefix convert(DegreeStream degreeStream);
+
+    @EnumMapping(nameTransformationStrategy = "stripPrefix", configuration = "MSC_")
+    DegreeStream convert(DegreeStreamPrefix degreeStreamPrefix);
+}

src/main/java/com/example/nisum/MapStruct/mapper/ManagerMapper.java

+package com.example.nisum.MapStruct.mapper;
+
+import com.example.nisum.MapStruct.dto.ManagerDTO;
+import com.example.nisum.MapStruct.model.Manager;
+import org.mapstruct.Mapper;
+import org.mapstruct.factory.Mappers;
+
+@Mapper
+public interface ManagerMapper {
+
+    ManagerMapper INSTANCE = Mappers.getMapper(ManagerMapper.class);
+
+    ManagerDTO convert(Manager manager);
+}

src/main/java/com/example/nisum/MapStruct/mapper/PersonMapperAdderPreferred.java

+package com.example.nisum.MapStruct.mapper;
+
+import com.example.nisum.MapStruct.dto.PersonDTO;
+import com.example.nisum.MapStruct.model.Person;
+import org.mapstruct.CollectionMappingStrategy;
+import org.mapstruct.Mapper;
+
+@Mapper(collectionMappingStrategy = CollectionMappingStrategy.ADDER_PREFERRED,
+        uses = ManagerMapper.class)
+public interface PersonMapperAdderPreferred {
+    PersonDTO map(Person person);
+}
\ No newline at end of file

src/main/java/com/example/nisum/MapStruct/model/Address.java

+
+package com.example.nisum.MapStruct.model;
+
+import lombok.Builder;
+import lombok.Data;
+import lombok.ToString;
+
+@Data
+@Builder
+@ToString
+public class Address {
+    private String houseNo;
+    private String landmark;
+    private String city;
+    private String state;
+    private String country;
+    private String zipcode;
+}
\ No newline at end of file

src/main/java/com/example/nisum/MapStruct/model/BasicUser.java

+package com.example.nisum.MapStruct.model;
+
+import lombok.Builder;
+import lombok.Data;
+import lombok.ToString;
+
+import java.util.List;
+
+@Data
+@Builder
+@ToString
+public class BasicUser {
+
+    private int id;
+    private String name;
+    private List<Manager> managerList;
+}

src/main/java/com/example/nisum/MapStruct/model/Education.java

+package com.example.nisum.MapStruct.model;
+
+import lombok.Builder;
+import lombok.Data;
+import lombok.ToString;
+
+@Data
+@Builder
+@ToString
+public class Education {
+    private String degreeName;
+    private String institute;
+    private Integer yearOfPassing;
+}
\ No newline at end of file

src/main/java/com/example/nisum/MapStruct/model/Employment.java

+package com.example.nisum.MapStruct.model;
+
+import lombok.Builder;
+import lombok.Data;
+import lombok.ToString;
+
+@Data
+@Builder
+@ToString
+public class Employment {
+
+    private String deptName;
+    private String deptId;
+    private String orgName;
+}

src/main/java/com/example/nisum/MapStruct/model/Manager.java

+package com.example.nisum.MapStruct.model;
+
+import lombok.Builder;
+import lombok.Data;
+import lombok.ToString;
+
+@Data
+@Builder
+@ToString
+public class Manager {
+  private int id;
+  private String name;
+}
\ No newline at end of file

src/main/java/com/example/nisum/MapStruct/model/Person.java

+package com.example.nisum.MapStruct.model;
+
+import com.example.nisum.MapStruct.dto.EducationDTO;
+import com.example.nisum.MapStruct.dto.EmploymentDTO;
+import com.example.nisum.MapStruct.dto.ManagerDTO;
+import lombok.Builder;
+import lombok.Data;
+import lombok.ToString;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@Data
+@Builder
+@ToString
+public class Person {
+
+    private String id;
+    private String firstName;
+    private String lastName;
+    private String educationalQualification;
+    private String residentialCity;
+    private String residentialCountry;
+    private String designation;
+    private long salary;
+    private EducationDTO education;
+    private List<ManagerDTO> managerList;
+    private List<EmploymentDTO> employmentDTOS;
+
+    public List<ManagerDTO> getManagerList() {
+        return managerList;
+    }
+
+    public void setManagerList(List<ManagerDTO> managers) {
+        this.managerList = managers;
+    }
+
+    public void addManagerList(ManagerDTO managerDTO) {
+        if (managerList == null) {
+            managerList = new ArrayList<>();
+        }
+
+        managerList.add(managerDTO);
+    }
+
+}

src/main/resources/application.properties

+

src/test/java/com/example/nisum/MapStruct/CollectionMapperTest.java

+package com.example.nisum.MapStruct;
+
+import com.example.nisum.MapStruct.mapper.CollectionMapper;
+import org.junit.jupiter.api.Test;
+import org.mapstruct.Mapper;
+import org.mapstruct.factory.Mappers;
+import org.springframework.boot.test.context.SpringBootTest;
+
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.Set;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+@SpringBootTest
+public class CollectionMapperTest {
+
+    private CollectionMapper mapper = Mappers.getMapper(CollectionMapper.class);
+
+    @Test
+    public void testSet() {
+        Set<Long> set = new HashSet<>(Arrays.asList(1L, 2L, 3L, 4L, 5L));
+        Set<String> convert = mapper.convert(set);
+        assertEquals(set.size(),convert.size());
+    }
+}

src/test/java/com/example/nisum/MapStruct/MapStructApplicationTests.java

+package com.example.nisum.MapStruct;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class MapStructApplicationTests {
+
+	@Test
+	void contextLoads() {
+	}
+
+}

src/test/java/com/example/nisum/MapStruct/UserMapperTest.java

+package com.example.nisum.MapStruct;
+
+import com.example.nisum.MapStruct.model.Address;
+import com.example.nisum.MapStruct.dto.BasicUserDto;
+import com.example.nisum.MapStruct.model.Education;
+import com.example.nisum.MapStruct.dto.PersonDTO;
+import com.example.nisum.MapStruct.mapper.BasicMapper;
+import com.example.nisum.MapStruct.model.BasicUser;
+import com.example.nisum.MapStruct.model.Manager;
+import org.junit.jupiter.api.Test;
+import org.mapstruct.factory.Mappers;
+import org.springframework.boot.test.context.SpringBootTest;
+
+import javax.xml.bind.ValidationException;
+import java.util.ArrayList;
+import java.util.Arrays;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+@SpringBootTest
+public class UserMapperTest {
+
+    private BasicMapper basicMapper = Mappers.getMapper(BasicMapper.class);
+
+    @Test
+    public void convertBasicUserToBasicUserDTO() {
+        BasicUser basicUser = BasicUser.builder().id(1).name("Ravinder").build();
+        BasicUserDto basicUserDto = basicMapper.convert(basicUser);
+
+        assertEquals(basicUser.getName(), basicUserDto.getName());
+        assertEquals(basicUser.getId(), basicUserDto.getId());
+    }
+
+    @Test
+    public void convertBasicUserDTOToBasicUser() {
+        BasicUserDto basicUserDto = BasicUserDto.builder().id(1).name("Ravinder").build();
+        BasicUser basicUser = basicMapper.convert(basicUserDto);
+
+        assertEquals(basicUserDto.getName(), basicUser.getName());
+        assertEquals(basicUserDto.getId(), basicUser.getId());
+    }
+
+    @Test
+    public void convertBasicUserToPersonDTO() {
+        BasicUser basicUser = BasicUser.builder().id(1).name("Ravinder Pannala").build();
+        PersonDTO personDTO = basicMapper.convertCustom(basicUser);
+
+        assertEquals(String.valueOf(basicUser.getId()), personDTO.getId());
+        assertNotNull(personDTO.getLastName());
+        assertNotNull(personDTO.getFirstName());
+    }
+
+    @Test
+    public void convertUserEducationAddToPersonDTO() {
+        BasicUser basicUser = BasicUser.builder().id(2).name("Ravinder Pannala").build();
+        Education education = Education.builder().degreeName("MHVR").build();
+        Address address = Address.builder().city("Hyd").state("TG").build();
+
+        PersonDTO personDTO = basicMapper.convert(basicUser, education, address);
+
+        assertEquals(basicUser.getName(), personDTO.getFirstName());
+        assertEquals(address.getCity(), personDTO.getResidentialCity());
+        assertEquals(education.getDegreeName(), personDTO.getEducationalQualification());
+    }
+
+    @Test
+    public void convertManagersListToPersonDTO() {
+        Manager manager = Manager.builder().id(1).name("VEN").build();
+        BasicUser basicUser = BasicUser.builder().id(2).name("Ravinder Pannala").managerList(Arrays.asList(manager)).build();
+        Education education = Education.builder().degreeName("MHVR").build();
+        Address address = Address.builder().city("Hyd").state("TG").build();
+
+        PersonDTO personDTO = basicMapper.convert(basicUser, education, address);
+
+        assertEquals(basicUser.getManagerList().size(), personDTO.getManagerList().size());
+        assertEquals(basicUser.getManagerList().get(0).getName(), personDTO.getManagerList().get(0).getName());
+    }
+
+}