Source project for the draft article

model-mapper/src/com/baeldung/model/User.java

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+package com.baeldung.model;
+
+import java.util.List;
+
+/**
+ * @author sasam0320
+ * @date 4/18/2020
+ */
+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;
+    }
+
+
+}

model-mapper/src/com/baeldung/model/UserDTO.java

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+package com.baeldung.model;
+
+import java.util.List;
+
+/**
+ * @author sasam0320
+ * @date 4/18/2020
+ */
+public class UserDTO {
+
+    private String userId;
+    private String userName;
+    private String email;
+    private List<String> usernames;
+
+    // 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;
+    }
+
+    public List<String> getUsernames() {
+        return usernames;
+    }
+
+    public void setUsernames(List<String> usernames) {
+        this.usernames = usernames;
+    }
+}

model-mapper/src/com/baeldung/model/UserList.java

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+package com.baeldung.model;
+
+import java.util.Collection;
+
+/**
+ * @author sasam0320
+ * @date 4/18/2020
+ */
+
+public class UserList {
+
+    private Collection<User> users;
+
+    public Collection<User> getUsers() {
+        return users;
+    }
+
+    public void setUsers(Collection<User> users) {
+        this.users = users;
+    }
+}

model-mapper/src/com/baeldung/util/MapperUtil.java

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+package com.baeldung.util;
+
+import org.modelmapper.ModelMapper;
+import org.modelmapper.convention.MatchingStrategies;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * @author sasam0320
+ * @date 4/18/2020
+ */
+public class MapperUtil {
+
+
+    private static ModelMapper modelMapper = new ModelMapper();
+
+
+    static {
+
+        modelMapper.getConfiguration().setMatchingStrategy(MatchingStrategies.STRICT);
+
+    }
+
+    private MapperUtil() {
+
+
+    }
+
+    public static <S, T> T mapTo(final S source, final Class<T> target) {
+
+        return modelMapper.map(source, target);
+    }
+
+    public static <S, T> List<T> mapList(final List<S> sourceList, final Class<T> target) {
+
+        List<T> targetList = new ArrayList<T>();
+
+        for (S source : sourceList) {
+
+            targetList.add(modelMapper.map(source, target));
+        }
+
+        return targetList;
+    }
+
+}

model-mapper/src/com/baeldung/util/UserPropertyMap.java

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+package com.baeldung.util;
+
+import com.baeldung.model.User;
+import com.baeldung.model.UserDTO;
+import com.baeldung.model.UserList;
+import org.modelmapper.AbstractConverter;
+import org.modelmapper.Converter;
+import org.modelmapper.PropertyMap;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * @author sasam0320
+ * @date 4/18/2020
+ */
+
+public class UserPropertyMap extends PropertyMap<UserList, UserDTO> {
+
+
+    Converter<List<User>, List<String>> converter = new AbstractConverter<List<User>, List<String>>() {
+
+        List<String> usernames = new ArrayList<>();
+
+        protected List<String> convert(List<User> users) {
+
+            users.forEach(user -> usernames.add(user.getUserName()));
+            return usernames;
+        }
+
+    };
+
+    @Override
+    protected void configure() {
+        using(converter).map(source.getUsers(), destination.getUsernames());
+    }
+}