/**
 * The MIT License
 * Copyright (c) 2014-2016 Ilkka Seppälä
 * <p>
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * <p>
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * <p>
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.iluwatar.converter;


import com.google.common.collect.Lists;

import java.util.ArrayList;
import java.util.List;

/**
 * The Converter pattern is a behavioral design pattern which allows a common way of bidirectional
 * conversion between corresponding types (e.g. DTO and domain representations of the logically
 * isomorphic types). Moreover, the pattern introduces a common way of converting a collection of
 * objects between types.
 */
public class App {
  /**
   * Program entry point
   *
   * @param args command line args
   */
  public static void main(String[] args) {
    Converter<UserDto, User> userConverter = new Converter<>(
        userDto -> new User(userDto.getFirstName(), userDto.getLastName(), userDto.isActive(),
          userDto.getEmail()),
        user -> new UserDto(user.getFirstName(), user.getLastName(), user.isActive(), user.getUserId()));

    UserDto dtoUser = new UserDto("John", "Doe", true, "whatever[at]wherever.com");
    User user = userConverter.convertFromDto(dtoUser);
    System.out.println("Entity converted from DTO:" + user);

    ArrayList<User> users = Lists.newArrayList(new User("Camile", "Tough", false, "124sad"),
        new User("Marti", "Luther", true, "42309fd"), new User("Kate", "Smith", true, "if0243"));
    System.out.println("Domain entities:");
    users.forEach(System.out::println);

    System.out.println("DTO entities converted from domain:");
    List<UserDto> dtoEntities = userConverter.createFromEntities(users);
    dtoEntities.forEach(System.out::println);

  }
}

/**
 * The MIT License
 * Copyright (c) 2014-2016 Ilkka Seppälä
 * <p>
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * <p>
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * <p>
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.iluwatar.converter;


import com.google.common.collect.Lists;

import java.util.ArrayList;
import java.util.List;

/**
 * The Converter pattern is a behavioral design pattern which allows a common way of bidirectional
 * conversion between corresponding types (e.g. DTO and domain representations of the logically
 * isomorphic types). Moreover, the pattern introduces a common way of converting a collection of
 * objects between types.
 */
public class App {
  /**
   * Program entry point
   *
   * @param args command line args
   */
  public static void main(String[] args) {
    Converter<UserDto, User> userConverter = new UserConverter();

    UserDto dtoUser = new UserDto("John", "Doe", true, "whatever[at]wherever.com");
    User user = userConverter.convertFromDto(dtoUser);
    System.out.println("Entity converted from DTO:" + user);

    ArrayList<User> users = Lists.newArrayList(new User("Camile", "Tough", false, "124sad"),
        new User("Marti", "Luther", true, "42309fd"), new User("Kate", "Smith", true, "if0243"));
    System.out.println("Domain entities:");
    users.forEach(System.out::println);

    System.out.println("DTO entities converted from domain:");
    List<UserDto> dtoEntities = userConverter.createFromEntities(users);
    dtoEntities.forEach(System.out::println);

  }
}

Use UserConverter instead of rewriting its ctor