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iluwatariluwatar
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added flyweight sample
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12 files changed

+191
-1
lines changed

12 files changed

+191
-1
lines changed

‎flyweight/pom.xml‎

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<?xml version="1.0"?>
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<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" 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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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>com.iluwatar</groupId>
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<artifactId>java-design-patterns</artifactId>
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<version>1.0-SNAPSHOT</version>
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</parent>
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<groupId>com.iluwatar</groupId>
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<artifactId>flyweight</artifactId>
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<version>1.0-SNAPSHOT</version>
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<name>flyweight</name>
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<url>http://maven.apache.org</url>
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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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<version>3.8.1</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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</project>

‎flyweight/src/main/java/com/iluwatar/AlchemistShop.java‎

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package com.iluwatar;
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import java.util.ArrayList;
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import java.util.List;
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public class AlchemistShop {
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List<Potion> topShelf;
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List<Potion> bottomShelf;
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public AlchemistShop() {
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topShelf = new ArrayList<>();
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bottomShelf = new ArrayList<>();
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fillShelves();
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}
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private void fillShelves() {
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topShelf.add(new InvisibilityPotion());
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topShelf.add(new InvisibilityPotion());
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topShelf.add(new StrengthPotion());
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topShelf.add(new HealingPotion());
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topShelf.add(new InvisibilityPotion());
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topShelf.add(new StrengthPotion());
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topShelf.add(new HealingPotion());
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topShelf.add(new HealingPotion());
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bottomShelf.add(new PoisonPotion());
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bottomShelf.add(new PoisonPotion());
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bottomShelf.add(new PoisonPotion());
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bottomShelf.add(new HolyWaterPotion());
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bottomShelf.add(new HolyWaterPotion());
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}
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public void enumerate() {
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System.out.println("Enumerating top shelf potions\n");
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for (Potion p: topShelf) {
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p.drink();
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}
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System.out.println("\nEnumerating bottom shelf potions\n");
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for (Potion p: bottomShelf) {
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p.drink();
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}
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}
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}

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

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package com.iluwatar;
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public class App
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{
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public static void main( String[] args )
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{
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AlchemistShop alchemistShop = new AlchemistShop();
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alchemistShop.enumerate();
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}
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}

‎flyweight/src/main/java/com/iluwatar/HealingPotion.java‎

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package com.iluwatar;
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public class HealingPotion implements Potion {
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@Override
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public void drink() {
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System.out.println("You feel healed.");
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}
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}

‎flyweight/src/main/java/com/iluwatar/HolyWaterPotion.java‎

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package com.iluwatar;
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public class HolyWaterPotion implements Potion {
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@Override
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public void drink() {
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System.out.println("You feel blessed.");
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}
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}

‎flyweight/src/main/java/com/iluwatar/InvisibilityPotion.java‎

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package com.iluwatar;
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public class InvisibilityPotion implements Potion {
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@Override
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public void drink() {
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System.out.println("You become invisible.");
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}
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}

‎flyweight/src/main/java/com/iluwatar/PoisonPotion.java‎

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package com.iluwatar;
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public class PoisonPotion implements Potion {
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@Override
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public void drink() {
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System.out.println("Urgh! This is poisonous.");
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}
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}

‎flyweight/src/main/java/com/iluwatar/Potion.java‎

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package com.iluwatar;
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public interface Potion {
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public void drink();
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}

‎flyweight/src/main/java/com/iluwatar/PotionFactory.java‎

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package com.iluwatar;
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import java.util.EnumMap;
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public class PotionFactory {
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private EnumMap<PotionType, Potion> potions;
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public PotionFactory() {
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potions = new EnumMap<>(PotionType.class);
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}
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Potion createPotion(PotionType type) {
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Potion potion = potions.get(type);
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if (potion == null) {
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switch (type) {
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case HEALING:
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potion = new HealingPotion();
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break;
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case HOLY_WATER:
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potion = new HolyWaterPotion();
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break;
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case INVISIBILITY:
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potion = new InvisibilityPotion();
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break;
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case POISON:
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potion = new PoisonPotion();
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break;
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case STRENGTH:
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potion = new StrengthPotion();
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break;
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default:
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break;
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}
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}
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return potion;
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}
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}

‎flyweight/src/main/java/com/iluwatar/PotionType.java‎

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package com.iluwatar;
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public enum PotionType {
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HEALING,
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INVISIBILITY,
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STRENGTH,
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HOLY_WATER,
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POISON;
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}

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