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iluwatar#497 Converter pattern implementation
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‎converter/README.md‎

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---
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layout: pattern
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title: Converter
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folder: converter
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permalink: /patterns/converter/
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categories:
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tags:
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- Java
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- Difficulty-Beginner
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---
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## Intent
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TODO
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![alt text](./etc/converter.png "TODO")
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## Applicability
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TODO
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* TODO 1
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* TODO 2
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## Credits
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* [Converter](http://todo.com)

‎converter/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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<parent>
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<artifactId>java-design-patterns</artifactId>
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<groupId>com.iluwatar</groupId>
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<version>1.15.0-SNAPSHOT</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<dependencies>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<artifactId>converter</artifactId>
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</project>

‎converter/src/main/java/com/iluwatar/converter/App.java‎

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/**
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* The MIT License
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* Copyright (c) 2014-2016 Ilkka Seppälä
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* <p>
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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* <p>
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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* <p>
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package com.iluwatar.converter;
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/**
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*
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*
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*/
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public class App {
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/**
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* Program entry point
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*
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* @param args command line args
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*/
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public static void main(String[] args) {
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Converter<UserDto, User> userConverter = new Converter<>(
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userDto -> new User(userDto.getName(), userDto.getSurname(), userDto.isActive()),
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user -> new UserDto(user.getName(), user.getSurname(), user.isActive()));
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UserDto dtoUser = new UserDto("John", "Doe", true);
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User user = userConverter.convertFromDTO(dtoUser);
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UserDto dtoUserCopy = userConverter.convertFromEntity(user);
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}
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}

‎converter/src/main/java/com/iluwatar/converter/Converter.java‎

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

‎converter/src/main/java/com/iluwatar/converter/User.java‎

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/**
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* The MIT License
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* Copyright (c) 2014-2016 Ilkka Seppälä
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* <p>
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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* <p>
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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* <p>
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package com.iluwatar.converter;
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/**
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* Created by crossy on 2017-03-10.
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*/
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public class User {
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private String name;
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private String surname;
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private boolean isActive;
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/**
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*
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* @param name
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* @param surname
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* @param isActive
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*/
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public User(String name, String surname, boolean isActive) {
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this.name = name;
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this.surname = surname;
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this.isActive = isActive;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public String getSurname() {
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return surname;
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}
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public void setSurname(String surname) {
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this.surname = surname;
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}
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public boolean isActive() {
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return isActive;
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}
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public void setActive(boolean active) {
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isActive = active;
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}
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}

‎converter/src/main/java/com/iluwatar/converter/UserDto.java‎

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

‎converter/src/test/java/com/iluwatar/converter/AppTest.java‎

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/**
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* The MIT License
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* Copyright (c) 2014-2016 Ilkka Seppälä
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
10+
* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package com.iluwatar.converter;
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import org.junit.Test;
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public class AppTest {
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@Test
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public void testMain() {
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String[] args = {};
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App.main(args);
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}
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}

‎pom.xml‎

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<module>event-asynchronous</module>
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<module>queue-load-leveling</module>
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<module>object-mother</module>
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<module>converter</module>
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</modules>
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<dependencyManagement>
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</plugins>
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</reporting>
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</project>
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</project>

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