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Merge pull request #9147 from sasam0320/BAEL-3986 

BAEL 3986 - mapping lists using ModelMapper
This commit is contained in:
rpvilao 2020-04-30 16:59:30 +02:00 committed by GitHub
parent 89da31cbce cd07a21b8e
commit f4f6c2fe88
9 changed files with 323 additions and 3 deletions
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17
java-collections-conversions-2/pom.xml
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@ -20,6 +20,23 @@
<artifactId>commons-lang3</artifactId>
<version>${commons-lang3.version}</version>
</dependency>
<dependency>
<groupId>org.modelmapper</groupId>
<artifactId>modelmapper</artifactId>
<version>${modelmapper.version}</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.hamcrest</groupId>
<artifactId>hamcrest</artifactId>
<version>${hamcrest.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>

32
java-collections-conversions-2/src/main/java/com/baeldung/modelmapper/MapperUtil.java Normal file
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@ -0,0 +1,32 @@
package com.baeldung.modelmapper;
import org.modelmapper.ModelMapper;
import java.util.List;
import java.util.stream.Collectors;
/**
* This is a helper class that contains method for custom mapping of the users list.
* Initially, an instance of ModelMapper was created.
*
* @author Sasa Milenkovic
*/
public class MapperUtil {
private static ModelMapper modelMapper = new ModelMapper();
private MapperUtil() {
}
public static <S, T> List<T> mapList(List<S> source, Class<T> targetClass) {
return source
.stream()
.map(element -> modelMapper.map(element, targetClass))
.collect(Collectors.toList());
}
}

70
java-collections-conversions-2/src/main/java/com/baeldung/modelmapper/User.java Normal file
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@ -0,0 +1,70 @@
package com.baeldung.modelmapper;
/**
* User model entity class
*
* @author Sasa Milenkovic
*/
public class User {
private String userId;
private String username;
private String email;
private String contactNumber;
private String userType;
// Standard constructors, getters and setters
public User() {
}
public User(String userId, String username, String email, String contactNumber, String userType) {
this.userId = userId;
this.username = username;
this.email = email;
this.contactNumber = contactNumber;
this.userType = userType;
}
public String getUserId() {
return userId;
}
public void setUserId(String userId) {
this.userId = userId;
}
public String getUsername() {
return username;
}
public void setUsername(String userName) {
this.username = userName;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getContactNumber() {
return contactNumber;
}
public void setContactNumber(String contactNumber) {
this.contactNumber = contactNumber;
}
public String getUserType() {
return userType;
}
public void setUserType(String userType) {
this.userType = userType;
}
}

41
java-collections-conversions-2/src/main/java/com/baeldung/modelmapper/UserDTO.java Normal file
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@ -0,0 +1,41 @@
package com.baeldung.modelmapper;
/**
* UserDTO model class
*
* @author Sasa Milenkovic
*/
public class UserDTO {
private String userId;
private String username;
private String email;
// getters and setters
public String getUserId() {
return userId;
}
public void setUserId(String userId) {
this.userId = userId;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
}

21
java-collections-conversions-2/src/main/java/com/baeldung/modelmapper/UserList.java Normal file
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@ -0,0 +1,21 @@
package com.baeldung.modelmapper;
import java.util.Collection;
/**
* UserList class that contain collection of users
*
* @author Sasa Milenkovic
*/
public class UserList {
private Collection<User> users;
public Collection<User> getUsers() {
return users;
}
public void setUsers(Collection<User> users) {
this.users = users;
}
}

21
java-collections-conversions-2/src/main/java/com/baeldung/modelmapper/UserListDTO.java Normal file
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@ -0,0 +1,21 @@
package com.baeldung.modelmapper;
import java.util.List;
/**
* UserListDTO class that contain list of username properties
*
* @author Sasa Milenkovic
*/
public class UserListDTO {
private List<String> usernames;
public List<String> getUsernames() {
return usernames;
}
public void setUsernames(List<String> usernames) {
this.usernames = usernames;
}
}

23
java-collections-conversions-2/src/main/java/com/baeldung/modelmapper/UsersListConverter.java Normal file
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@ -0,0 +1,23 @@
package com.baeldung.modelmapper;
import org.modelmapper.AbstractConverter;
import java.util.List;
import java.util.stream.Collectors;
/**
* UsersListConverter class map the property data from the list of users into the list of user names.
*
* @author Sasa Milenkovic
*/
public class UsersListConverter extends AbstractConverter<List<User>, List<String>> {
@Override
protected List<String> convert(List<User> users) {
return users
.stream()
.map(User::getUsername)
.collect(Collectors.toList());
}
}

92
java-collections-conversions-2/src/test/java/com/baeldung/modelmapper/UsersListMappingUnitTest.java Normal file
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@ -0,0 +1,92 @@
package com.baeldung.modelmapper;
import org.hamcrest.Matchers;
import org.junit.Before;
import org.junit.Test;
import org.modelmapper.ModelMapper;
import org.modelmapper.TypeMap;
import org.modelmapper.TypeToken;
import java.util.ArrayList;
import java.util.List;
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.hasItems;
import static org.hamcrest.Matchers.hasProperty;
import static org.junit.Assert.assertThat;
/**
* This class has test methods of mapping Integer to Character list,
* mapping users list to DTO list using MapperUtil custom type method and property mapping using converter class
*
* @author Sasa Milenkovic
*/
public class UsersListMappingUnitTest {
private ModelMapper modelMapper;
private List<User> users;
@Before
public void init() {
modelMapper = new ModelMapper();
TypeMap<UserList, UserListDTO> typeMap = modelMapper.createTypeMap(UserList.class, UserListDTO.class);
typeMap.addMappings(mapper -> mapper.using(new UsersListConverter())
.map(UserList::getUsers, UserListDTO::setUsernames));
users = new ArrayList();
users.add(new User("b100", "user1", "user1@baeldung.com", "111-222", "USER"));
users.add(new User("b101", "user2", "user2@baeldung.com", "111-333", "USER"));
users.add(new User("b102", "user3", "user3@baeldung.com", "111-444", "ADMIN"));
}
@Test
public void whenInteger_thenMapToCharacter() {
List<Integer> integers = new ArrayList<Integer>();
integers.add(1);
integers.add(2);
integers.add(3);
List<Character> characters = modelMapper.map(integers, new TypeToken<List<Character>>() {
}.getType());
assertThat(characters, hasItems('1', '2', '3'));
}
@Test
public void givenUsersList_whenUseGenericType_thenMapToUserDTO() {
// Mapping lists using custom (generic) type mapping
List<UserDTO> userDtoList = MapperUtil.mapList(users, UserDTO.class);
assertThat(userDtoList, Matchers.<UserDTO>hasItem(
Matchers.both(hasProperty("userId", equalTo("b100")))
.and(hasProperty("email", equalTo("user1@baeldung.com")))
.and(hasProperty("username", equalTo("user1")))));
}
@Test
public void givenUsersList_whenUseConverter_thenMapToUsernames() {
// Mapping lists using property mapping and converter
UserList userList = new UserList();
userList.setUsers(users);
UserListDTO dtos = new UserListDTO();
modelMapper.map(userList, dtos);
assertThat(dtos.getUsernames(), hasItems("user1", "user2", "user3"));
}
}

5
parent-java/pom.xml
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@ -1,7 +1,7 @@
<?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"
xmlns="http://maven.apache.org/POM/4.0.0"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>parent-java</artifactId>
@ -45,6 +45,9 @@
<guava.version>23.0</guava.version>
<commons.io.version>2.6</commons.io.version>
<jmh.version>1.19</jmh.version>
<modelmapper.version>2.3.7</modelmapper.version>
<junit.version>4.12</junit.version>
<hamcrest.version>2.2</hamcrest.version>
</properties>
</project>