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Commitba90059

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Added the prototype pattern and its unit test
1 parentee985d5 commitba90059

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6 files changed

+122
-0
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6 files changed

+122
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lines changed
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packagesrc.main.java.com.designpatterns.creational.prototype;
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classBlackColorextendsColor {
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BlackColor() {
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this.colorName ="black";
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}
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@Override
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publicStringaddColor() {
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return"Black color added";
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}
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}
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packagesrc.main.java.com.designpatterns.creational.prototype;
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classBlueColorextendsColor {
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BlueColor() {
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this.colorName ="blue";
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}
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@Override
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publicStringaddColor() {
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return"Blue color added";
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}
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}
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packagesrc.main.java.com.designpatterns.creational.prototype;
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/**
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* The prototype pattern is used when the type of objects to create is determined by a prototypical instance, which
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* is cloned to produce new objects. <p>
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* This pattern is used to:
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* 1. avoid subclasses of an object creator in the client application, like the factory method pattern does.
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* 2. avoid the inherent cost of creating a new object in the standard way (e.g., using the 'new' keyword) when it is
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* prohibitively expensive for a given application.
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*
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* @see <a href="https://en.wikipedia.org/wiki/Prototype_pattern">Prototype Pattern</a>
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*/
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publicabstractclassColorimplementsCloneable {
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StringcolorName;
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publicabstractStringaddColor();
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/**
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* This method should be called from the client instead of writing code that invokes the "new" operator on a
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* hard-coded class name.
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*
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* @return a clone for the object
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*/
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publicObjectclone() {
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Objectclone =null;
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try {
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clone =super.clone();
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}catch (CloneNotSupportedExceptione) {
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e.printStackTrace();
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}
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returnclone;
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}
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}
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packagesrc.main.java.com.designpatterns.creational.prototype;
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importjava.util.HashMap;
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importjava.util.Map;
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publicclassColorStore {
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privatestaticMap<String,Color>colorMap =newHashMap<>();
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static {
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colorMap.put("blue",newBlueColor());
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colorMap.put("black",newBlackColor());
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colorMap.put("red",newRedColor());
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}
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publicstaticColorgetColor(StringcolorName) {
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return (Color)colorMap.get(colorName).clone();
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}
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}
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packagesrc.main.java.com.designpatterns.creational.prototype;
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classRedColorextendsColor {
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RedColor() {
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this.colorName ="red";
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}
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@Override
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publicStringaddColor() {
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return"Red color added";
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}
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}
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packagesrc.test.java.com.designpatterns.creational.prototype;
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importorg.junit.Assert;
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importorg.junit.Test;
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importsrc.main.java.com.designpatterns.creational.prototype.ColorStore;
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publicclassPrototypeTest {
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@Test
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publicvoidtestPrototype() {
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StringtestFailReason ="";
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StringtestOne =ColorStore.getColor("blue").addColor();
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if (!"Blue color added".equals(testOne)) {
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testFailReason +="TC 1 Failed: Blue couldn't be added\n";
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}
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StringtestTwo =ColorStore.getColor("black").addColor();
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if (!"Black color added".equals(testTwo)) {
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testFailReason +="TC 2 Failed: Black couldn't be added\n";
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}
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StringtestThree =ColorStore.getColor("red").addColor();
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if (!"Red color added".equals(testThree)) {
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testFailReason +="TC 3 Failed: Red couldn't be added\n";
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}
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StringtestFour =ColorStore.getColor("blue").addColor();
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if (!"Blue color added".equals(testFour)) {
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testFailReason +="TC 4 Failed: Blue couldn't be added\n";
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}
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Assert.assertEquals(testFailReason,"",testFailReason);
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}
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}

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