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[JAVA-14174] Renamed paterns to paterns-module (#12718)

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* [JAVA-14174] Renamed paterns to paterns-module

* [JAVA-14174] naming fixes

Co-authored-by: panagiotiskakos <panagiotis.kakos@libra-is.com>
This commit is contained in:
panos-kakos
2022-09-19 07:44:14 +01:00
committed by GitHub
parent 368dd6de19
commit b153cff200
518 changed files with 32 additions and 32 deletions
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10
patterns-modules/design-patterns-creational/README.md Normal file
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### Relevant Articles:
- [Singletons in Java](https://www.baeldung.com/java-singleton)
- [Introduction to Creational Design Patterns](https://www.baeldung.com/creational-design-patterns)
- [Abstract Factory Pattern in Java](https://www.baeldung.com/java-abstract-factory-pattern)
- [Flyweight Pattern in Java](https://www.baeldung.com/java-flyweight)
- [Double-Checked Locking with Singleton](https://www.baeldung.com/java-singleton-double-checked-locking)
- [Java Constructors vs Static Factory Methods](https://www.baeldung.com/java-constructors-vs-static-factory-methods)
- [Automatic Generation of the Builder Pattern with FreeBuilder](https://www.baeldung.com/java-builder-pattern-freebuilder)
- [How to Replace Many if Statements in Java](https://www.baeldung.com/java-replace-if-statements)
- [Prototype Pattern in Java](https://www.baeldung.com/java-pattern-prototype)

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patterns-modules/design-patterns-creational/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">
<modelVersion>4.0.0</modelVersion>
<artifactId>design-patterns-creational</artifactId>
<version>1.0</version>
<name>design-patterns-creational</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>patterns-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
</parent>
<dependencies>
<dependency>
<groupId>org.inferred</groupId>
<artifactId>freebuilder</artifactId>
<version>${freebuilder.version}</version>
<optional>true</optional>
</dependency>
<dependency>
<groupId>com.google.code.findbugs</groupId>
<artifactId>jsr305</artifactId>
<version>${javax.annotations.version}</version>
</dependency>
</dependencies>
<properties>
<freebuilder.version>2.4.1</freebuilder.version>
<javax.annotations.version>3.0.2</javax.annotations.version>
</properties>
</project>

12
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/constructorsstaticfactorymethods/application/Application.java Normal file
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package com.baeldung.constructorsstaticfactorymethods.application;
import com.baeldung.constructorsstaticfactorymethods.entities.User;
public class Application {
public static void main(String[] args) {
User user1 = User.createWithDefaultCountry("John", "john@domain.com");
User user2 = User.createWithLoggedInstantiationTime("John", "john@domain.com", "Argentina");
User user3 = User.getSingletonInstance("John", "john@domain.com", "Argentina");
}
}

56
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/constructorsstaticfactorymethods/entities/User.java Normal file
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package com.baeldung.constructorsstaticfactorymethods.entities;
import java.time.LocalTime;
import java.util.logging.ConsoleHandler;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.logging.SimpleFormatter;
public class User {
private static volatile User instance = null;
private static final Logger LOGGER = Logger.getLogger(User.class.getName());
private final String name;
private final String email;
private final String country;
public static User createWithDefaultCountry(String name, String email) {
return new User(name, email, "Argentina");
}
public static User createWithLoggedInstantiationTime(String name, String email, String country) {
LOGGER.log(Level.INFO, "Creating User instance at : {0}", LocalTime.now());
return new User(name, email, country);
}
public static User getSingletonInstance(String name, String email, String country) {
if (instance == null) {
synchronized (User.class) {
if (instance == null) {
instance = new User(name, email, country);
}
}
}
return instance;
}
private User(String name, String email, String country) {
this.name = name;
this.email = email;
this.country = country;
}
public String getName() {
return name;
}
public String getEmail() {
return email;
}
public String getCountry() {
return country;
}
}

5
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/creational/abstractfactory/AbstractFactory.java Normal file
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package com.baeldung.creational.abstractfactory;
public interface AbstractFactory<T> {
T create(String type) ;
}

18
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/creational/abstractfactory/AbstractPatternDriver.java Normal file
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package com.baeldung.creational.abstractfactory;
public class AbstractPatternDriver {
public static void main(String[] args) {
AbstractFactory abstractFactory;
//creating a brown toy dog
abstractFactory = FactoryProvider.getFactory("Toy");
Animal toy =(Animal) abstractFactory.create("Dog");
abstractFactory = FactoryProvider.getFactory("Color");
Color color =(Color) abstractFactory.create("Brown");
String result = "A " + toy.getType() + " with " + color.getColor() + " color " + toy.makeSound();
System.out.println(result);
}
}

6
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/creational/abstractfactory/Animal.java Normal file
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package com.baeldung.creational.abstractfactory;
public interface Animal {
String getType();
String makeSound();
}

16
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/creational/abstractfactory/AnimalFactory.java Normal file
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package com.baeldung.creational.abstractfactory;
public class AnimalFactory implements AbstractFactory<Animal> {
@Override
public Animal create(String animalType) {
if ("Dog".equalsIgnoreCase(animalType)) {
return new Dog();
} else if ("Duck".equalsIgnoreCase(animalType)) {
return new Duck();
}
return null;
}
}

10
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/creational/abstractfactory/Brown.java Normal file
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package com.baeldung.creational.abstractfactory;
public class Brown implements Color {
@Override
public String getColor() {
return "brown";
}
}

5
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/creational/abstractfactory/Color.java Normal file
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package com.baeldung.creational.abstractfactory;
public interface Color {
String getColor();
}

16
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/creational/abstractfactory/ColorFactory.java Normal file
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package com.baeldung.creational.abstractfactory;
public class ColorFactory implements AbstractFactory<Color> {
@Override
public Color create(String colorType) {
if ("Brown".equalsIgnoreCase(colorType)) {
return new Brown();
} else if ("White".equalsIgnoreCase(colorType)) {
return new White();
}
return null;
}
}

15
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/creational/abstractfactory/Dog.java Normal file
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package com.baeldung.creational.abstractfactory;
public class Dog implements Animal {
@Override
public String getType() {
return "Dog";
}
@Override
public String makeSound() {
return "Barks";
}
}

15
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/creational/abstractfactory/Duck.java Normal file
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package com.baeldung.creational.abstractfactory;
public class Duck implements Animal {
@Override
public String getType() {
return "Duck";
}
@Override
public String makeSound() {
return "Squeks";
}
}

15
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/creational/abstractfactory/FactoryProvider.java Normal file
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package com.baeldung.creational.abstractfactory;
public class FactoryProvider {
public static AbstractFactory getFactory(String choice){
if("Toy".equalsIgnoreCase(choice)){
return new AnimalFactory();
}
else if("Color".equalsIgnoreCase(choice)){
return new ColorFactory();
}
return null;
}
}

10
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/creational/abstractfactory/White.java Normal file
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package com.baeldung.creational.abstractfactory;
public class White implements Color {
@Override
public String getColor() {
return "White";
}
}

64
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/creational/builder/BankAccount.java Normal file
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package com.baeldung.creational.builder;
public class BankAccount {
private String name;
private String accountNumber;
private String email;
private boolean newsletter;
//The constructor that takes a builder from which it will create object
//the access to this is only provided to builder
private BankAccount(BankAccountBuilder builder) {
this.name = builder.name;
this.accountNumber = builder.accountNumber;
this.email = builder.email;
this.newsletter = builder.newsletter;
}
public static class BankAccountBuilder {
private String name;
private String accountNumber;
private String email;
private boolean newsletter;
//All Mandatory parameters goes with this constructor
public BankAccountBuilder(String name, String accountNumber) {
this.name = name;
this.accountNumber = accountNumber;
}
//setters for optional parameters which returns this same builder
//to support fluent design
public BankAccountBuilder withEmail(String email) {
this.email = email;
return this;
}
public BankAccountBuilder wantNewsletter(boolean newsletter) {
this.newsletter = newsletter;
return this;
}
//the actual build method that prepares and returns a BankAccount object
public BankAccount build() {
return new BankAccount(this);
}
}
//getters
public String getName() {
return name;
}
public String getAccountNumber() {
return accountNumber;
}
public String getEmail() {
return email;
}
public boolean isNewsletter() {
return newsletter;
}
}

16
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/creational/builder/BuilderPatternDriver.java Normal file
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package com.baeldung.creational.builder;
public class BuilderPatternDriver {
public static void main(String[] args) {
BankAccount newAccount = new BankAccount
.BankAccountBuilder("Jon", "22738022275")
.withEmail("jon@example.com")
.wantNewsletter(true)
.build();
System.out.println("Name: " + newAccount.getName());
System.out.println("AccountNumber:" + newAccount.getAccountNumber());
System.out.println("Email: " + newAccount.getEmail());
System.out.println("Want News letter?: " + newAccount.isNewsletter());
}
}

16
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/creational/factory/FactoryDriver.java Normal file
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package com.baeldung.creational.factory;
public class FactoryDriver {
public static void main(String[] args) {
Polygon p;
PolygonFactory factory = new PolygonFactory();
//get the shape which has 4 sides
p = factory.getPolygon(4);
System.out.println("The shape with 4 sides is a " + p.getType());
//get the shape which has 4 sides
p = factory.getPolygon(8);
System.out.println("The shape with 8 sides is a " + p.getType());
}
}

10
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/creational/factory/Heptagon.java Normal file
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package com.baeldung.creational.factory;
public class Heptagon implements Polygon {
@Override
public String getType() {
return "Heptagon";
}
}

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patterns-modules/design-patterns-creational/src/main/java/com/baeldung/creational/factory/Octagon.java Normal file
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package com.baeldung.creational.factory;
public class Octagon implements Polygon {
@Override
public String getType() {
return "Octagon";
}
}

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patterns-modules/design-patterns-creational/src/main/java/com/baeldung/creational/factory/Pentagon.java Normal file
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package com.baeldung.creational.factory;
public class Pentagon implements Polygon {
@Override
public String getType() {
return "Pentagon";
}
}

5
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/creational/factory/Polygon.java Normal file
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package com.baeldung.creational.factory;
public interface Polygon {
String getType();
}

22
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/creational/factory/PolygonFactory.java Normal file
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package com.baeldung.creational.factory;
public class PolygonFactory {
public Polygon getPolygon(int numberOfSides) {
if(numberOfSides == 3) {
return new Triangle();
}
if(numberOfSides == 4) {
return new Square();
}
if(numberOfSides == 5) {
return new Pentagon();
}
if(numberOfSides == 7) {
return new Heptagon();
}
else if(numberOfSides == 8) {
return new Octagon();
}
return null;
}
}

10
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/creational/factory/Square.java Normal file
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package com.baeldung.creational.factory;
public class Square implements Polygon {
@Override
public String getType() {
return "Square";
}
}

10
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/creational/factory/Triangle.java Normal file
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package com.baeldung.creational.factory;
public class Triangle implements Polygon {
@Override
public String getType() {
return "Triangle";
}
}

13
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/creational/singleton/Singleton.java Normal file
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package com.baeldung.creational.singleton;
public class Singleton {
private Singleton() {}
private static class SingletonHolder {
public static final Singleton instance = new Singleton();
}
public static Singleton getInstance() {
return SingletonHolder.instance;
}
}

8
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/creational/singleton/SingletonDriver.java Normal file
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package com.baeldung.creational.singleton;
public class SingletonDriver {
public static void main(String[] args) {
Singleton instance = Singleton.getInstance();
System.out.println(instance.toString());
}
}

82
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/flyweight/Car.java Normal file
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package com.baeldung.flyweight;
import java.awt.Color;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Represents a car. This class is immutable.
*
* @author Donato Rimenti
*/
public class Car implements Vehicle {
/**
* Logger.
*/
private final static Logger LOG = LoggerFactory.getLogger(Car.class);
/**
* The car's engine.
*/
private Engine engine;
/**
* The car's color.
*/
private Color color;
/**
* Instantiates a new Car.
*
* @param engine
* the {@link #engine}
* @param color
* the {@link #color}
*/
public Car(Engine engine, Color color) {
this.engine = engine;
this.color = color;
// Building a new car is a very expensive operation!
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
LOG.error("Error while creating a new car", e);
}
}
/*
* (non-Javadoc)
*
* @see com.baeldung.flyweight.Vehicle#start()
*/
@Override
public void start() {
LOG.info("Car is starting!");
engine.start();
}
/*
* (non-Javadoc)
*
* @see com.baeldung.flyweight.Vehicle#stop()
*/
@Override
public void stop() {
LOG.info("Car is stopping!");
engine.stop();
}
/*
* (non-Javadoc)
*
* @see com.baeldung.flyweight.Vehicle#getColor()
*/
@Override
public Color getColor() {
return this.color;
}
}

31
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/flyweight/Engine.java Normal file
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package com.baeldung.flyweight;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Engine for a vehicle.
*
* @author Donato Rimenti
*/
public class Engine {
/**
* Logger.
*/
private final static Logger LOG = LoggerFactory.getLogger(Engine.class);
/**
* Starts the engine.
*/
public void start() {
LOG.info("Engine is starting!");
}
/**
* Stops the engine.
*/
public void stop() {
LOG.info("Engine is stopping!");
}
}

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patterns-modules/design-patterns-creational/src/main/java/com/baeldung/flyweight/Vehicle.java Normal file
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package com.baeldung.flyweight;
import java.awt.Color;
/**
* Interface for a vehicle.
*
* @author Donato Rimenti
*/
public interface Vehicle {
/**
* Starts the vehicle.
*/
public void start();
/**
* Stops the vehicle.
*/
public void stop();
/**
* Gets the color of the vehicle.
*
* @return the color of the vehicle
*/
public Color getColor();
}

45
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/flyweight/VehicleFactory.java Normal file
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package com.baeldung.flyweight;
import java.awt.Color;
import java.util.HashMap;
import java.util.Map;
/**
* Factory which implements the Flyweight pattern to return an existing vehicle
* if present or a new one otherwise.
*
* @author Donato Rimenti
*/
public class VehicleFactory {
/**
* Stores the already created vehicles.
*/
private static Map<Color, Vehicle> vehiclesCache = new HashMap<Color, Vehicle>();
/**
* Private constructor to prevent this class instantiation.
*/
private VehicleFactory() {
}
/**
* Returns a vehicle of the same color passed as argument. If that vehicle
* was already created by this factory, that vehicle is returned, otherwise
* a new one is created and returned.
*
* @param color
* the color of the vehicle to return
* @return a vehicle of the specified color
*/
public static Vehicle createVehicle(Color color) {
// Looks for the requested vehicle into the cache.
// If the vehicle doesn't exist, a new one is created.
Vehicle newVehicle = vehiclesCache.computeIfAbsent(color, newColor -> {
// Creates the new car.
Engine newEngine = new Engine();
return new Car(newEngine, newColor);
});
return newVehicle;
}
}

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patterns-modules/design-patterns-creational/src/main/java/com/baeldung/freebuilder/Address.java Normal file
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package com.baeldung.freebuilder;
import org.inferred.freebuilder.FreeBuilder;
import java.util.Optional;
@FreeBuilder
public interface Address {
Optional<String> getAddressLine1();
Optional<String> getAddressLine2();
Optional<String> getAddressLine3();
String getCity();
Optional<String> getState();
Optional<Long> getPinCode();
class Builder extends Address_Builder {
}
}

65
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/freebuilder/Employee.java Normal file
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package com.baeldung.freebuilder;
import org.inferred.freebuilder.FreeBuilder;
import javax.annotation.Nullable;
import java.util.List;
import java.util.Map;
import java.util.Optional;
@FreeBuilder
public interface Employee {
String getName();
int getAge();
String getDepartment();
String getRole();
String getSupervisorName();
String getDesignation();
String getEmail();
long getPhoneNumber();
Optional<Boolean> getPermanent();
Optional<String> getDateOfJoining();
@Nullable
String getCurrentProject();
Address getAddress();
List<Long> getAccessTokens();
Map<String, Long> getAssetsSerialIdMapping();
Optional<Double> getSalaryInUSD();
class Builder extends Employee_Builder {
public Builder() {
// setting default value for department
setDepartment("Builder Pattern");
}
@Override
public Builder setEmail(String email) {
if (checkValidEmail(email))
return super.setEmail(email);
else
throw new IllegalArgumentException("Invalid email");
}
private boolean checkValidEmail(String email) {
return email.contains("@");
}
}
}

53
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/freebuilder/builder/Employee.java Normal file
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package com.baeldung.freebuilder.builder;
public class Employee {
private final String name;
private final int age;
private final String department;
private Employee(String name, int age, String department) {
this.name = name;
this.age = age;
this.department = department;
}
public String getName() {
return name;
}
public int getAge() {
return age;
}
public String getDepartment() {
return department;
}
public static class Builder {
private String name;
private int age;
private String department;
public Builder setName(String name) {
this.name = name;
return this;
}
public Builder setAge(int age) {
this.age = age;
return this;
}
public Builder setDepartment(String department) {
this.department = department;
return this;
}
public Employee build() {
return new Employee(name, age, department);
}
}
}

23
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/prototype/PineTree.java Normal file
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package com.baeldung.prototype;
public class PineTree extends Tree {
private String type;
public PineTree(double mass, double height) {
super(mass, height);
this.type = "Pine";
}
public String getType() {
return type;
}
@Override
public Tree copy() {
PineTree pineTreeClone = new PineTree(this.getMass(), this.getHeight());
pineTreeClone.setPosition(this.getPosition());
return pineTreeClone;
}
}

23
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/prototype/PlasticTree.java Normal file
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package com.baeldung.prototype;
public class PlasticTree extends Tree {
private String name;
public PlasticTree(double mass, double height) {
super(mass, height);
this.name = "PlasticTree";
}
public String getName() {
return name;
}
@Override
public Tree copy() {
PlasticTree plasticTreeClone = new PlasticTree(this.getMass(), this.getHeight());
plasticTreeClone.setPosition(this.getPosition());
return plasticTreeClone;
}
}

51
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/prototype/Position.java Normal file
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package com.baeldung.prototype;
public final class Position {
private final int x;
private final int y;
public Position(int x, int y) {
this.x = x;
this.y = y;
}
public int getX() {
return x;
}
public int getY() {
return y;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + x;
result = prime * result + y;
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Position other = (Position) obj;
if (x != other.x)
return false;
if (y != other.y)
return false;
return true;
}
@Override
public String toString() {
return "Position [x=" + x + ", y=" + y + "]";
}
}

44
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/prototype/Tree.java Normal file
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package com.baeldung.prototype;
public abstract class Tree {
private double mass;
private double height;
private Position position;
public Tree(double mass, double height) {
this.mass = mass;
this.height = height;
}
public void setMass(double mass) {
this.mass = mass;
}
public void setHeight(double height) {
this.height = height;
}
public void setPosition(Position position) {
this.position = position;
}
public double getMass() {
return mass;
}
public double getHeight() {
return height;
}
public Position getPosition() {
return position;
}
@Override
public String toString() {
return "Tree [mass=" + mass + ", height=" + height + ", position=" + position + "]";
}
public abstract Tree copy();
}

17
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/reducingIfElse/AddCommand.java Normal file
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package com.baeldung.reducingIfElse;
public class AddCommand implements Command {
private int a;
private int b;
public AddCommand(int a, int b) {
this.a = a;
this.b = b;
}
@Override
public Integer execute() {
return a + b;
}
}

21
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/reducingIfElse/AddRule.java Normal file
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package com.baeldung.reducingIfElse;
public class AddRule implements Rule {
private int result;
@Override
public boolean evaluate(Expression expression) {
boolean evalResult = false;
if (expression.getOperator() == Operator.ADD) {
this.result = expression.getX() + expression.getY();
evalResult = true;
}
return evalResult;
}
@Override
public Result getResult() {
return new Result(result);
}
}

8
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/reducingIfElse/Addition.java Normal file
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@@ -0,0 +1,8 @@
package com.baeldung.reducingIfElse;
public class Addition implements Operation {
@Override
public int apply(int a, int b) {
return a + b;
}
}

83
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/reducingIfElse/Calculator.java Normal file
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package com.baeldung.reducingIfElse;
public class Calculator {
public int calculate(int a, int b, String operator) {
int result = Integer.MIN_VALUE;
if ("add".equals(operator)) {
result = a + b;
} else if ("multiply".equals(operator)) {
result = a * b;
} else if ("divide".equals(operator)) {
result = a / b;
} else if ("subtract".equals(operator)) {
result = a - b;
} else if ("modulo".equals(operator)) {
result = a % b;
}
return result;
}
public int calculateUsingSwitch(int a, int b, String operator) {
int result = 0;
switch (operator) {
case "add":
result = a + b;
break;
case "multiply":
result = a * b;
break;
case "divide":
result = a / b;
break;
case "subtract":
result = a - b;
break;
case "modulo":
result = a % b;
break;
default:
result = Integer.MIN_VALUE;
}
return result;
}
public int calculateUsingSwitch(int a, int b, Operator operator) {
int result = 0;
switch (operator) {
case ADD:
result = a + b;
break;
case MULTIPLY:
result = a * b;
break;
case DIVIDE:
result = a / b;
break;
case SUBTRACT:
result = a - b;
break;
case MODULO:
result = a % b;
break;
default:
result = Integer.MIN_VALUE;
}
return result;
}
public int calculate(int a, int b, Operator operator) {
return operator.apply(a, b);
}
public int calculateUsingFactory(int a, int b, String operation) {
Operation targetOperation = OperatorFactory.getOperation(operation)
.orElseThrow(() -> new IllegalArgumentException("Invalid Operator"));
return targetOperation.apply(a, b);
}
public int calculate(Command command) {
return command.execute();
}
}

5
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/reducingIfElse/Command.java Normal file
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package com.baeldung.reducingIfElse;
public interface Command {
Integer execute();
}

7
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/reducingIfElse/Division.java Normal file
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package com.baeldung.reducingIfElse;
public class Division implements Operation {
@Override public int apply(int a, int b) {
return a / b;
}
}

26
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/reducingIfElse/Expression.java Normal file
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package com.baeldung.reducingIfElse;
public class Expression {
private Integer x;
private Integer y;
private Operator operator;
public Expression(Integer x, Integer y, Operator operator) {
this.x = x;
this.y = y;
this.operator = operator;
}
public Integer getX() {
return x;
}
public Integer getY() {
return y;
}
public Operator getOperator() {
return operator;
}
}

7
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/reducingIfElse/Modulo.java Normal file
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@@ -0,0 +1,7 @@
package com.baeldung.reducingIfElse;
public class Modulo implements Operation {
@Override public int apply(int a, int b) {
return a % b;
}
}

7
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/reducingIfElse/Multiplication.java Normal file
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@@ -0,0 +1,7 @@
package com.baeldung.reducingIfElse;
public class Multiplication implements Operation {
@Override public int apply(int a, int b) {
return 0;
}
}

5
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/reducingIfElse/Operation.java Normal file
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@@ -0,0 +1,5 @@
package com.baeldung.reducingIfElse;
public interface Operation {
int apply(int a, int b);
}

41
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/reducingIfElse/Operator.java Normal file
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@@ -0,0 +1,41 @@
package com.baeldung.reducingIfElse;
public enum Operator {
ADD {
@Override
public int apply(int a, int b) {
return a + b;
}
},
MULTIPLY {
@Override
public int apply(int a, int b) {
return a * b;
}
},
SUBTRACT {
@Override
public int apply(int a, int b) {
return a - b;
}
},
DIVIDE {
@Override
public int apply(int a, int b) {
return a / b;
}
},
MODULO {
@Override
public int apply(int a, int b) {
return a % b;
}
};
public abstract int apply(int a, int b);
}

21
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/reducingIfElse/OperatorFactory.java Normal file
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package com.baeldung.reducingIfElse;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;
public class OperatorFactory {
static Map<String, Operation> operationMap = new HashMap<>();
static {
operationMap.put("add", new Addition());
operationMap.put("divide", new Division());
operationMap.put("multiply", new Multiplication());
operationMap.put("subtract", new Subtraction());
operationMap.put("modulo", new Modulo());
}
public static Optional<Operation> getOperation(String operation) {
return Optional.ofNullable(operationMap.get(operation));
}
}

13
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/reducingIfElse/Result.java Normal file
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package com.baeldung.reducingIfElse;
public class Result {
int value;
public Result(int value) {
this.value = value;
}
public int getValue() {
return value;
}
}

8
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/reducingIfElse/Rule.java Normal file
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@@ -0,0 +1,8 @@
package com.baeldung.reducingIfElse;
public interface Rule {
boolean evaluate(Expression expression);
Result getResult();
}

24
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/reducingIfElse/RuleEngine.java Normal file
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package com.baeldung.reducingIfElse;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;
public class RuleEngine {
private static List<Rule> rules = new ArrayList<>();
static {
rules.add(new AddRule());
}
public Result process(Expression expression) {
Rule rule = rules.stream()
.filter(r -> r.evaluate(expression))
.findFirst()
.orElseThrow(() -> new IllegalArgumentException("Expression does not matches any Rule"));
return rule.getResult();
}
}

7
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/reducingIfElse/Subtraction.java Normal file
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package com.baeldung.reducingIfElse;
public class Subtraction implements Operation {
@Override public int apply(int a, int b) {
return a - b;
}
}

28
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/singleton/ClassSingleton.java Normal file
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package com.baeldung.singleton;
public class ClassSingleton {
private static ClassSingleton INSTANCE;
private String info = "Initial class info";
private ClassSingleton(){
}
public static ClassSingleton getInstance(){
if(INSTANCE == null){
INSTANCE = new ClassSingleton();
}
return INSTANCE;
}
// getters and setters
public String getInfo() {
return info;
}
public void setInfo(String info) {
this.info = info;
}
}

26
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/singleton/EnumSingleton.java Normal file
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package com.baeldung.singleton;
public enum EnumSingleton {
INSTANCE("Initial enum info"); //Name of the single instance
private String info;
private EnumSingleton(String info) {
this.info = info;
}
public EnumSingleton getInstance(){
return INSTANCE;
}
//getters and setters
public String getInfo() {
return info;
}
public void setInfo(String info) {
this.info = info;
}
}

32
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/singleton/Sandbox.java Normal file
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package com.baeldung.singleton;
public class Sandbox {
public static void main(String[] args) {
//Class singleton
ClassSingleton classSingleton1 = ClassSingleton.getInstance();
//OurSingleton object1 = new OurSingleton(); // The constructor OurSingleton() is not visible
System.out.println(classSingleton1.getInfo()); //Initial class info
ClassSingleton classSingleton2 = ClassSingleton.getInstance();
classSingleton2.setInfo("New class info");
System.out.println(classSingleton1.getInfo()); //New class info
System.out.println(classSingleton2.getInfo()); //New class info
//Enum singleton
EnumSingleton enumSingleton1 = EnumSingleton.INSTANCE.getInstance();
System.out.println(enumSingleton1.getInfo()); //Initial enum info
EnumSingleton enumSingleton2 = EnumSingleton.INSTANCE.getInstance();
enumSingleton2.setInfo("New enum info");
System.out.println(enumSingleton1.getInfo()); //New enum info
System.out.println(enumSingleton2.getInfo()); //New enum info
}
}

38
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/singleton/synchronization/DclSingleton.java Normal file
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package com.baeldung.singleton.synchronization;
/**
* Double-checked locking design pattern applied to a singleton.
*
* @author Donato Rimenti
*
*/
public class DclSingleton {
/**
* Current instance of the singleton.
*/
private static volatile DclSingleton instance;
/**
* Private constructor to avoid instantiation.
*/
private DclSingleton() {
}
/**
* Returns the current instance of the singleton.
*
* @return the current instance of the singleton
*/
public static DclSingleton getInstance() {
if (instance == null) {
synchronized (DclSingleton.class) {
if (instance == null) {
instance = new DclSingleton();
}
}
}
return instance;
}
}

34
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/singleton/synchronization/DraconianSingleton.java Normal file
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package com.baeldung.singleton.synchronization;
/**
* Draconian singleton. The method to get the instance is synchronized.
*
* @author Donato Rimenti
*
*/
public class DraconianSingleton {
/**
* Current instance of the singleton.
*/
private static DraconianSingleton instance;
/**
* Private constructor to avoid instantiation.
*/
private DraconianSingleton() {
}
/**
* Returns the current instance of the singleton.
*
* @return the current instance of the singleton
*/
public static synchronized DraconianSingleton getInstance() {
if (instance == null) {
instance = new DraconianSingleton();
}
return instance;
}
}

31
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/singleton/synchronization/EarlyInitSingleton.java Normal file
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package com.baeldung.singleton.synchronization;
/**
* Singleton with early initialization. Inlines the singleton instance
* initialization.
*
* @author Donato Rimenti
*
*/
public class EarlyInitSingleton {
/**
* Current instance of the singleton.
*/
private static final EarlyInitSingleton INSTANCE = new EarlyInitSingleton();
/**
* Private constructor to avoid instantiation.
*/
private EarlyInitSingleton() {
}
/**
* Returns the current instance of the singleton.
*
* @return the current instance of the singleton
*/
public static EarlyInitSingleton getInstance() {
return INSTANCE;
}
}

16
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/singleton/synchronization/EnumSingleton.java Normal file
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package com.baeldung.singleton.synchronization;
/**
* Enum singleton pattern. Uses an enum to hold a reference to the singleton
* instance.
*
* @author Donato Rimenti
*
*/
public enum EnumSingleton {
/**
* Current instance of the singleton.
*/
INSTANCE;
}

41
patterns-modules/design-patterns-creational/src/main/java/com/baeldung/singleton/synchronization/InitOnDemandSingleton.java Normal file
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package com.baeldung.singleton.synchronization;
/**
* Initialization on demand singleton pattern. Uses a nested static class to
* hold a reference to the singleton instance.
*
* @author Donato Rimenti
*
*/
public class InitOnDemandSingleton {
/**
* Holder for a singleton instance.
*
* @author Donato Rimenti
*
*/
private static class InstanceHolder {
/**
* Current instance of the singleton.
*/
private static final InitOnDemandSingleton INSTANCE = new InitOnDemandSingleton();
}
/**
* Private constructor to avoid instantiation.
*/
private InitOnDemandSingleton() {
}
/**
* Returns the current instance of the singleton.
*
* @return the current instance of the singleton
*/
public static InitOnDemandSingleton getInstance() {
return InstanceHolder.INSTANCE;
}
}

43
patterns-modules/design-patterns-creational/src/test/java/com/baeldung/constructorsstaticfactorymethods/UserUnitTest.java Normal file
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package com.baeldung.constructorsstaticfactorymethods;
import com.baeldung.constructorsstaticfactorymethods.entities.User;
import static org.assertj.core.api.Assertions.assertThat;
import org.junit.Test;
public class UserUnitTest {
@Test
public void givenUserClass_whenCalledcreateWithDefaultCountry_thenCorrect() {
assertThat(User.createWithDefaultCountry("John", "john@domain.com")).isInstanceOf(User.class);
}
@Test
public void givenUserIntanceCreatedWithcreateWithDefaultCountry_whenCalledgetName_thenCorrect() {
User user = User.createWithDefaultCountry("John", "john@domain.com");
assertThat(user.getName()).isEqualTo("John");
}
@Test
public void givenUserIntanceCreatedWithcreateWithDefaultCountry_whenCalledgetEmail_thenCorrect() {
User user = User.createWithDefaultCountry("John", "john@domain.com");
assertThat(user.getEmail()).isEqualTo("john@domain.com");
}
@Test
public void givenUserIntanceCreatedWithcreateWithDefaultCountry_whenCalledgetCountry_thenCorrect() {
User user = User.createWithDefaultCountry("John", "john@domain.com");
assertThat(user.getCountry()).isEqualTo("Argentina");
}
@Test
public void givenUserInstanceCreatedWithcreateWithInstantiationTime_whenCalledcreateWithInstantiationTime_thenCorrect() {
assertThat(User.createWithLoggedInstantiationTime("John", "john@domain.com", "Argentina")).isInstanceOf(User.class);
}
@Test
public void givenUserInstanceCreatedWithgetSingletonIntance_whenCalledgetSingletonInstance_thenCorrect() {
User user1 = User.getSingletonInstance("John", "john@domain.com", "Argentina");
User user2 = User.getSingletonInstance("John", "john@domain.com", "Argentina");
assertThat(user1).isEqualTo(user2);
}
}

23
patterns-modules/design-patterns-creational/src/test/java/com/baeldung/creational/abstractfactory/AbstractPatternIntegrationTest.java Normal file
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package com.baeldung.creational.abstractfactory;
import static org.junit.Assert.*;
import org.junit.Test;
public class AbstractPatternIntegrationTest {
@Test
public void givenAbstractFactory_whenGettingObjects_thenSuccessful() {
AbstractFactory abstractFactory;
//creating a brown toy dog
abstractFactory = FactoryProvider.getFactory("Toy");
Animal toy = (Animal) abstractFactory.create("Dog");
abstractFactory = FactoryProvider.getFactory("Color");
Color color =(Color) abstractFactory.create("Brown");
String result = "A " + toy.getType() + " with " + color.getColor() + " color " + toy.makeSound();
assertEquals("A Dog with brown color Barks", result);
}
}

33
patterns-modules/design-patterns-creational/src/test/java/com/baeldung/creational/builder/BuilderPatternIntegrationTest.java Normal file
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package com.baeldung.creational.builder;
import static org.junit.Assert.assertEquals;
import org.junit.Test;
public class BuilderPatternIntegrationTest {
@Test
public void whenCreatingObjectThroughBuilder_thenObjectValid() {
BankAccount newAccount = new BankAccount
.BankAccountBuilder("Jon", "22738022275")
.withEmail("jon@example.com")
.wantNewsletter(true)
.build();
assertEquals(newAccount.getName(), "Jon");
assertEquals(newAccount.getAccountNumber(), "22738022275");
assertEquals(newAccount.getEmail(), "jon@example.com");
assertEquals(newAccount.isNewsletter(), true);
}
@Test
public void whenSkippingOptionalParameters_thenObjectValid() {
BankAccount newAccount = new BankAccount
.BankAccountBuilder("Jon", "22738022275")
.build();
assertEquals(newAccount.getName(), "Jon");
assertEquals(newAccount.getAccountNumber(), "22738022275");
assertEquals(newAccount.getEmail(), null);
assertEquals(newAccount.isNewsletter(), false);
}
}

32
patterns-modules/design-patterns-creational/src/test/java/com/baeldung/creational/factory/FactoryIntegrationTest.java Normal file
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package com.baeldung.creational.factory;
import static org.junit.Assert.*;
import org.junit.Test;
public class FactoryIntegrationTest {
@Test
public void whenUsingFactoryForSquare_thenCorrectObjectReturned() {
Polygon p;
PolygonFactory factory = new PolygonFactory();
//get the shape which has 4 sides
p = factory.getPolygon(4);
String result = "The shape with 4 sides is a " + p.getType();
assertEquals("The shape with 4 sides is a Square", result);
}
@Test
public void whenUsingFactoryForOctagon_thenCorrectObjectReturned() {
Polygon p;
PolygonFactory factory = new PolygonFactory();
//get the shape which has 4 sides
p = factory.getPolygon(8);
String result = "The shape with 8 sides is a " + p.getType();
assertEquals("The shape with 8 sides is a Octagon", result);
}
}

26
patterns-modules/design-patterns-creational/src/test/java/com/baeldung/creational/singleton/SingletonIntegrationTest.java Normal file
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package com.baeldung.creational.singleton;
import org.junit.Test;
import static org.junit.Assert.*;
public class SingletonIntegrationTest {
@Test
/**
* Although there is absolutely no way to determine whether
* a class is Singleton, in this test case, we will just
* check for two objects if they point to same instance or
* not. We will also check for their hashcode.
*/
public void whenGettingMultipleObjects_thenAllPointToSame() {
//first object
Singleton obj1 = Singleton.getInstance();
//Second object
Singleton obj2 = Singleton.getInstance();
assertTrue(obj1 == obj2);
assertEquals(obj1.hashCode(), obj2.hashCode());
}
}

42
patterns-modules/design-patterns-creational/src/test/java/com/baeldung/flyweight/FlyweightUnitTest.java Normal file
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package com.baeldung.flyweight;
import java.awt.Color;
import org.junit.Assert;
import org.junit.Test;
/**
* Unit test for {@link VehicleFactory}.
*
* @author Donato Rimenti
*/
public class FlyweightUnitTest {
/**
* Checks that when the {@link VehicleFactory} is asked to provide two
* vehicles of different colors, the objects returned are different.
*/
@Test
public void givenDifferentFlyweightObjects_whenEquals_thenFalse() {
Vehicle blackVehicle = VehicleFactory.createVehicle(Color.BLACK);
Vehicle blueVehicle = VehicleFactory.createVehicle(Color.BLUE);
Assert.assertNotNull("Object returned by the factory is null!", blackVehicle);
Assert.assertNotNull("Object returned by the factory is null!", blueVehicle);
Assert.assertNotEquals("Objects returned by the factory are equals!", blackVehicle, blueVehicle);
}
/**
* Checks that when the {@link VehicleFactory} is asked to provide two
* vehicles of the same colors, the same object is returned twice.
*/
@Test
public void givenSameFlyweightObjects_whenEquals_thenTrue() {
Vehicle blackVehicle = VehicleFactory.createVehicle(Color.BLACK);
Vehicle anotherBlackVehicle = VehicleFactory.createVehicle(Color.BLACK);
Assert.assertNotNull("Object returned by the factory is null!", blackVehicle);
Assert.assertNotNull("Object returned by the factory is null!", anotherBlackVehicle);
Assert.assertEquals("Objects returned by the factory are not equals!", blackVehicle, anotherBlackVehicle);
}
}

226
patterns-modules/design-patterns-creational/src/test/java/com/baeldung/freebuilder/EmployeeBuilderUnitTest.java Normal file
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package com.baeldung.freebuilder;
import org.junit.jupiter.api.Test;
import java.util.Optional;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertNull;
import static org.junit.jupiter.api.Assertions.assertTrue;
public class EmployeeBuilderUnitTest {
private static final int PIN_CODE = 223344;
public static final String CITY_NAME = "New York";
public static final int INPUT_SALARY_EUROS = 10000;
public static final double EUROS_TO_USD_RATIO = 0.6;
@Test
public void whenBuildEmployeeWithAddress_thenReturnEmployeeWithValidAddress() {
// when
Address.Builder addressBuilder = new Address.Builder();
Address address = addressBuilder.setCity(CITY_NAME).build();
Employee.Builder builder = new Employee.Builder();
Employee employee = builder.setName("baeldung")
.setAge(10)
.setDesignation("author")
.setEmail("abc@xyz.com")
.setSupervisorName("Admin")
.setPhoneNumber(4445566)
.setPermanent(true)
.setRole("developer")
.setAddress(address)
.build();
// then
assertTrue(employee.getAddress().getCity().equalsIgnoreCase(CITY_NAME));
}
@Test
public void whenMapSalary_thenReturnEmployeeWithSalaryInUSD() {
// when
Address.Builder addressBuilder = new Address.Builder();
Address address = addressBuilder.setCity(CITY_NAME).setPinCode(PIN_CODE).build();
long salaryInEuros = INPUT_SALARY_EUROS;
Employee.Builder builder = new Employee.Builder();
Employee employee = builder
.setName("baeldung")
.setAge(10)
.setDesignation("author")
.setEmail("abc@xyz.com")
.setSupervisorName("Admin")
.setPhoneNumber(4445566)
.setPermanent(true)
.setRole("developer")
.setAddress(address)
.mapSalaryInUSD(sal -> salaryInEuros * EUROS_TO_USD_RATIO)
.build();
// then
assertTrue(employee.getAddress().getPinCode().get() == PIN_CODE);
}
@Test
public void whenOptionalFields_thenReturnEmployeeWithEmptyValues() {
// when
Address.Builder addressBuilder = new Address.Builder();
Address address = addressBuilder.setCity(CITY_NAME).build();
Employee.Builder builder = new Employee.Builder();
Employee employee = builder.setName("baeldung")
.setAge(10)
.setDesignation("author")
.setEmail("abc@xyz.com")
.setSupervisorName("Admin")
.setPhoneNumber(4445566)
.setPermanent(true)
.setRole("developer")
.setAddress(address)
.build();
// then
assertTrue(employee.getPermanent().isPresent());
assertTrue(employee.getPermanent().get());
assertFalse(employee.getDateOfJoining().isPresent());
}
@Test
public void whenNullableFields_thenReturnEmployeeWithNullValueForField() {
// when
Address.Builder addressBuilder = new Address.Builder();
Address address = addressBuilder.setCity(CITY_NAME).build();
Employee.Builder builder = new Employee.Builder();
Employee employee = builder.setName("baeldung")
.setAge(10)
.setDesignation("author")
.setEmail("abc@xyz.com")
.setSupervisorName("Admin")
.setPhoneNumber(4445566)
.setNullablePermanent(null)
.setDateOfJoining(Optional.empty())
.setRole("developer")
.setAddress(address)
.build();
// then
assertNull(employee.getCurrentProject());
}
@Test
public void whenCollectionFields_thenReturnEmployeeWithValues() {
// when
Address.Builder addressBuilder = new Address.Builder();
Address address = addressBuilder.setCity(CITY_NAME).build();
Employee.Builder builder = new Employee.Builder();
Employee employee = builder.setName("baeldung")
.setAge(10)
.setDesignation("author")
.setEmail("abc@xyz.com")
.setSupervisorName("Admin")
.setPhoneNumber(4445566)
.setNullablePermanent(null)
.setDateOfJoining(Optional.empty())
.setRole("developer")
.addAccessTokens(1221819L)
.addAccessTokens(1223441L, 134567L)
.setAddress(address)
.build();
// then
assertTrue(employee.getAccessTokens().size() == 3);
}
@Test
public void whenMapFields_thenReturnEmployeeWithValues() {
// when
Address.Builder addressBuilder = new Address.Builder();
Address address = addressBuilder.setCity(CITY_NAME).build();
Employee.Builder builder = new Employee.Builder();
Employee employee = builder.setName("baeldung")
.setAge(10)
.setDesignation("author")
.setEmail("abc@xyz.com")
.setSupervisorName("Admin")
.setPhoneNumber(4445566)
.setNullablePermanent(null)
.setDateOfJoining(Optional.empty())
.setRole("developer")
.addAccessTokens(1221819L)
.addAccessTokens(1223441L, 134567L)
.putAssetsSerialIdMapping("Laptop", 12345L)
.setAddress(address)
.build();
// then
assertTrue(employee.getAssetsSerialIdMapping().size() == 1);
}
@Test
public void whenNestedBuilderTypes_thenReturnEmployeeWithValues() {
// when
Address.Builder addressBuilder = new Address.Builder();
Address address = addressBuilder.setCity(CITY_NAME).build();
Employee.Builder builder = new Employee.Builder();
Employee employee = builder.setName("baeldung")
.setAge(10)
.setDesignation("author")
.setEmail("abc@xyz.com")
.setSupervisorName("Admin")
.setPhoneNumber(4445566)
.setNullablePermanent(null)
.setDateOfJoining(Optional.empty())
.setRole("developer")
.addAccessTokens(1221819L)
.addAccessTokens(1223441L, 134567L)
.putAssetsSerialIdMapping("Laptop", 12345L)
.setAddress(address)
.mutateAddress(a -> a.setPinCode(112200))
.build();
// then
assertTrue(employee.getAssetsSerialIdMapping().size() == 1);
}
@Test()
public void whenPartialEmployeeWithValidEmail_thenReturnEmployeeWithEmail() {
// when
Employee.Builder builder = new Employee.Builder();
Employee employee = builder.setName("baeldung")
.setAge(10)
.setEmail("abc@xyz.com")
.buildPartial();
assertNotNull(employee.getEmail());
}
}

27
patterns-modules/design-patterns-creational/src/test/java/com/baeldung/freebuilder/builder/EmployeeBuilderUnitTest.java Normal file
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package com.baeldung.freebuilder.builder;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
class EmployeeBuilderUnitTest {
public static final String NAME = "baeldung";
@Test
public void whenBuildEmployee_thenReturnValidEmployee() {
// when
Employee.Builder emplBuilder = new Employee.Builder();
Employee employee = emplBuilder
.setName(NAME)
.setAge(12)
.setDepartment("Builder Pattern")
.build();
//then
Assertions.assertTrue(employee.getName().equalsIgnoreCase(NAME));
}
}

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package com.baeldung.prototype;
import static org.junit.jupiter.api.Assertions.assertEquals;
import java.util.Arrays;
import java.util.List;
import static java.util.stream.Collectors.toList;
import org.junit.jupiter.api.Test;
public class TreePrototypeUnitTest {
@Test
public void givenAPlasticTreePrototypeWhenClonedThenCreateA_Clone() {
double mass = 10.0;
double height = 3.7;
Position position = new Position(3, 7);
Position otherPosition = new Position(4, 8);
PlasticTree plasticTree = new PlasticTree(mass, height);
plasticTree.setPosition(position);
PlasticTree anotherPlasticTree = (PlasticTree) plasticTree.copy();
anotherPlasticTree.setPosition(otherPosition);
assertEquals(position, plasticTree.getPosition());
assertEquals(otherPosition, anotherPlasticTree.getPosition());
}
@Test
public void givenAPineTreePrototypeWhenClonedThenCreateA_Clone() {
double mass = 10.0;
double height = 3.7;
Position position = new Position(3, 7);
Position otherPosition = new Position(4, 8);
PineTree pineTree = new PineTree(mass, height);
pineTree.setPosition(position);
PineTree anotherPineTree = (PineTree) pineTree.copy();
anotherPineTree.setPosition(otherPosition);
assertEquals(position, pineTree.getPosition());
assertEquals(otherPosition, anotherPineTree.getPosition());
}
@Test
public void givenA_ListOfTreesWhenClonedThenCreateListOfClones() {
double mass = 10.0;
double height = 3.7;
Position position = new Position(3, 7);
Position otherPosition = new Position(4, 8);
PlasticTree plasticTree = new PlasticTree(mass, height);
plasticTree.setPosition(position);
PineTree pineTree = new PineTree(mass, height);
pineTree.setPosition(otherPosition);
List<Tree> trees = Arrays.asList(plasticTree, pineTree);
List<Tree> treeClones = trees.stream().map(Tree::copy).collect(toList());
Tree plasticTreeClone = treeClones.get(0);
assertEquals(mass, plasticTreeClone.getMass());
assertEquals(height, plasticTreeClone.getHeight());
assertEquals(position, plasticTreeClone.getPosition());
}
}

39
patterns-modules/design-patterns-creational/src/test/java/com/baeldung/reduceIfelse/CalculatorUnitTest.java Normal file
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package com.baeldung.reduceIfelse;
import com.baeldung.reducingIfElse.AddCommand;
import com.baeldung.reducingIfElse.Calculator;
import com.baeldung.reducingIfElse.Operator;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
public class CalculatorUnitTest {
@Test
public void whenCalculateUsingStringOperator_thenReturnCorrectResult() {
Calculator calculator = new Calculator();
int result = calculator.calculate(3, 4, "add");
assertEquals(7, result);
}
@Test
public void whenCalculateUsingEnumOperator_thenReturnCorrectResult() {
Calculator calculator = new Calculator();
int result = calculator.calculate(3, 4, Operator.valueOf("ADD"));
assertEquals(7, result);
}
@Test
public void whenCalculateUsingCommand_thenReturnCorrectResult() {
Calculator calculator = new Calculator();
int result = calculator.calculate(new AddCommand(3, 7));
assertEquals(10, result);
}
@Test
public void whenCalculateUsingFactory_thenReturnCorrectResult() {
Calculator calculator = new Calculator();
int result = calculator.calculateUsingFactory(3, 4, "add");
assertEquals(7, result);
}
}

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patterns-modules/design-patterns-creational/src/test/java/com/baeldung/reduceIfelse/RuleEngineUnitTest.java Normal file
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package com.baeldung.reduceIfelse;
import com.baeldung.reducingIfElse.Expression;
import com.baeldung.reducingIfElse.Operator;
import com.baeldung.reducingIfElse.Result;
import com.baeldung.reducingIfElse.RuleEngine;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
public class RuleEngineUnitTest {
@Test
public void whenNumbersGivenToRuleEngine_thenReturnCorrectResult() {
Expression expression = new Expression(5, 5, Operator.ADD);
RuleEngine engine = new RuleEngine();
Result result = engine.process(expression);
assertNotNull(result);
assertEquals(10, result.getValue());
}
}

119
patterns-modules/design-patterns-creational/src/test/java/com/baeldung/singleton/synchronization/SingletonSynchronizationIntegrationTest.java Normal file
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package com.baeldung.singleton.synchronization;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import org.junit.Assert;
import org.junit.Test;
/**
* Unit tests for the singleton synchronization package with the same name.
*
* @author Donato Rimenti
*
*/
public class SingletonSynchronizationIntegrationTest {
/**
* Size of the thread pools used.
*/
private static final int POOL_SIZE = 1_000;
/**
* Number of tasks to submit.
*/
private static final int TASKS_TO_SUBMIT = 1_000_000;
/**
* Tests the thread-safety of {@link DraconianSingleton}.
*/
@Test
public void givenDraconianSingleton_whenMultithreadInstancesEquals_thenTrue() {
ExecutorService executor = Executors.newFixedThreadPool(POOL_SIZE);
Set<DraconianSingleton> resultSet = Collections.synchronizedSet(new HashSet<>());
// Submits the instantiation tasks.
for (int i = 0; i < TASKS_TO_SUBMIT; i++) {
executor.submit(() -> resultSet.add(DraconianSingleton.getInstance()));
}
// Since the instance of the object we inserted into the set is always
// the same, the size should be one.
Assert.assertEquals(1, resultSet.size());
}
/**
* Tests the thread-safety of {@link DclSingleton}.
*/
@Test
public void givenDclSingleton_whenMultithreadInstancesEquals_thenTrue() {
ExecutorService executor = Executors.newFixedThreadPool(POOL_SIZE);
Set<DclSingleton> resultSet = Collections.synchronizedSet(new HashSet<>());
// Submits the instantiation tasks.
for (int i = 0; i < TASKS_TO_SUBMIT; i++) {
executor.submit(() -> resultSet.add(DclSingleton.getInstance()));
}
// Since the instance of the object we inserted into the set is always
// the same, the size should be one.
Assert.assertEquals(1, resultSet.size());
}
/**
* Tests the thread-safety of {@link EarlyInitSingleton}.
*/
@Test
public void givenEarlyInitSingleton_whenMultithreadInstancesEquals_thenTrue() {
ExecutorService executor = Executors.newFixedThreadPool(POOL_SIZE);
Set<EarlyInitSingleton> resultSet = Collections.synchronizedSet(new HashSet<>());
// Submits the instantiation tasks.
for (int i = 0; i < TASKS_TO_SUBMIT; i++) {
executor.submit(() -> resultSet.add(EarlyInitSingleton.getInstance()));
}
// Since the instance of the object we inserted into the set is always
// the same, the size should be one.
Assert.assertEquals(1, resultSet.size());
}
/**
* Tests the thread-safety of {@link InitOnDemandSingleton}.
*/
@Test
public void givenInitOnDemandSingleton_whenMultithreadInstancesEquals_thenTrue() {
ExecutorService executor = Executors.newFixedThreadPool(POOL_SIZE);
Set<InitOnDemandSingleton> resultSet = Collections.synchronizedSet(new HashSet<>());
// Submits the instantiation tasks.
for (int i = 0; i < TASKS_TO_SUBMIT; i++) {
executor.submit(() -> resultSet.add(InitOnDemandSingleton.getInstance()));
}
// Since the instance of the object we inserted into the set is always
// the same, the size should be one.
Assert.assertEquals(1, resultSet.size());
}
/**
* Tests the thread-safety of {@link EnumSingleton}.
*/
@Test
public void givenEnumSingleton_whenMultithreadInstancesEquals_thenTrue() {
ExecutorService executor = Executors.newFixedThreadPool(POOL_SIZE);
Set<EnumSingleton> resultSet = Collections.synchronizedSet(new HashSet<>());
// Submits the instantiation tasks.
for (int i = 0; i < TASKS_TO_SUBMIT; i++) {
executor.submit(() -> resultSet.add(EnumSingleton.INSTANCE));
}
// Since the instance of the object we inserted into the set is always
// the same, the size should be one.
Assert.assertEquals(1, resultSet.size());
}
}