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#497 Converter pattern implementation

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This commit is contained in:
Kamil Pietruszka
2017-03-10 20:08:58 +01:00
parent e9c54011e9
commit 8871f788d2
8 changed files with 351 additions and 1 deletions
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25
converter/README.md Normal file
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---
layout: pattern
title: Converter
folder: converter
permalink: /patterns/converter/
categories:
tags:
- Java
- Difficulty-Beginner
---
## Intent
TODO
![alt text](./etc/converter.png "TODO")
## Applicability
TODO
* TODO 1
* TODO 2
## Credits
* [Converter](http://todo.com)

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converter/pom.xml Normal file
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<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>java-design-patterns</artifactId>
<groupId>com.iluwatar</groupId>
<version>1.15.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<artifactId>converter</artifactId>
</project>

44
converter/src/main/java/com/iluwatar/converter/App.java Normal file
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/**
* 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;
/**
*
*
*/
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.getName(), userDto.getSurname(), userDto.isActive()),
user -> new UserDto(user.getName(), user.getSurname(), user.isActive()));
UserDto dtoUser = new UserDto("John", "Doe", true);
User user = userConverter.convertFromDTO(dtoUser);
UserDto dtoUserCopy = userConverter.convertFromEntity(user);
}
}

86
converter/src/main/java/com/iluwatar/converter/Converter.java Normal file
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/**
* 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 java.util.Collection;
import java.util.List;
import java.util.function.Function;
import java.util.stream.Collectors;
/**
* @param <T>
* @param <U>
*/
public class Converter<T, U> {
/**
*
*/
private final Function<T, U> fromDTO;
/**
*
*/
private final Function<U, T> fromEntity;
/**
* @param fromDTO
* @param fromEntity
*/
public Converter(final Function<T, U> fromDTO, final Function<U, T> fromEntity) {
this.fromDTO = fromDTO;
this.fromEntity = fromEntity;
}
/**
* @param arg
* @return
*/
public U convertFromDTO(final T arg) {
return fromDTO.apply(arg);
}
/**
* @param arg
* @return
*/
public T convertFromEntity(final U arg) {
return fromEntity.apply(arg);
}
/**
* @param arg
* @return
*/
public List<U> createFromDTOs(final Collection<T> arg) {
return arg.stream().map(this::convertFromDTO).collect(Collectors.toList());
}
/**
* @param arg
* @return
*/
public List<T> createFromEntities(final Collection<U> arg) {
return arg.stream().map(this::convertFromEntity).collect(Collectors.toList());
}
}

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converter/src/main/java/com/iluwatar/converter/User.java Normal file
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/**
* 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;
/**
* Created by crossy on 2017-03-10.
*/
public class User {
private String name;
private String surname;
private boolean isActive;
/**
*
* @param name
* @param surname
* @param isActive
*/
public User(String name, String surname, boolean isActive) {
this.name = name;
this.surname = surname;
this.isActive = isActive;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSurname() {
return surname;
}
public void setSurname(String surname) {
this.surname = surname;
}
public boolean isActive() {
return isActive;
}
public void setActive(boolean active) {
isActive = active;
}
}

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converter/src/main/java/com/iluwatar/converter/UserDto.java Normal file
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/**
* 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;
/**
*
*/
public class UserDto {
private String name;
private String surname;
private boolean isActive;
/**
*
* @param name
* @param surname
* @param isActive
*/
public UserDto(String name, String surname, boolean isActive) {
this.name = name;
this.surname = surname;
this.isActive = isActive;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSurname() {
return surname;
}
public void setSurname(String surname) {
this.surname = surname;
}
public boolean isActive() {
return isActive;
}
public void setActive(boolean active) {
isActive = active;
}
}

35
converter/src/test/java/com/iluwatar/converter/AppTest.java Normal file
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/**
* The MIT License
* Copyright (c) 2014-2016 Ilkka Seppälä
*
* 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:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* 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 org.junit.Test;
public class AppTest {
@Test
public void testMain() {
String[] args = {};
App.main(args);
}
}

3
pom.xml
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@@ -134,6 +134,7 @@
<module>event-asynchronous</module>
<module>queue-load-leveling</module>
<module>object-mother</module>
<module>converter</module>
</modules>
<dependencyManagement>
@@ -466,4 +467,4 @@
</plugins>
</reporting>
</project>
</project>