#497 Converter pattern implementation

converter/README.md

@@ -0,0 +1,25 @@
+---
+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)

converter/pom.xml

@@ -0,0 +1,21 @@
+<?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>

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

@@ -0,0 +1,44 @@
+/**
+ * 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);
+
+  }
+}

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

@@ -0,0 +1,86 @@
+/**
+ * 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());
+  }
+
+}

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

@@ -0,0 +1,69 @@
+/**
+ * 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;
+  }
+}

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

@@ -0,0 +1,69 @@
+/**
+ * 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;
+  }
+}

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

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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);
+  }
+
+}

pom.xml

@@ -134,6 +134,7 @@
         <module>event-asynchronous</module>
         <module>queue-load-leveling</module>
         <module>object-mother</module>
+        <module>converter</module>
     </modules>
 
     <dependencyManagement>