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Commit8841314

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Added the code for Abstract factory pattern implementation and its unit test
1 parent4456658 commit8841314

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11 files changed

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packagesrc.main.java.com.designpatterns.creational.abstractfactory;
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/**
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* The abstract factory pattern provides a way to encapsulate a group of individual factories that have a common theme
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* without specifying their concrete classes. In normal usage, the client software creates a concrete implementation of
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* the abstract factory and then uses the generic interface of the factory to create the concrete objects that are part
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* of the theme. The client doesn't know (or care) which concrete objects it gets from each of these internal factories,
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* since it uses only the generic interfaces of their products.
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* <p>
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* This pattern separates the details of implementation of a set of objects from their general usage and relies on
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* object composition, as object creation is implemented in methods exposed in the factory interface.
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*
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* @see <a href="https://en.wikipedia.org/wiki/Abstract_factory_pattern">Abstract Factory Pattern</a>
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*/
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publicabstractclassAbstractShapeFactory {
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/**
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* Creates the appropriate shape object depending on the type of the shape
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*
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* @param name enum defining the name of the shape
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* @return shape object
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*/
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publicabstractShapegetShape(ShapeTypename);
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}
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packagesrc.main.java.com.designpatterns.creational.abstractfactory;
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publicclassCircleimplementsShape {
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@Override
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publicdoublesurfaceArea(floatradius) {
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returnMath.PI *radius *radius;
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}
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@Override
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publicShapeTypegetShapeType() {
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returnShapeType.CIRCLE;
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}
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}
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packagesrc.main.java.com.designpatterns.creational.abstractfactory;
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publicclassFactoryProvider {
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publicstaticAbstractShapeFactorygetShapeFactory(FactoryTypefactoryType) {
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if (FactoryType.TWO_D_FACTORY ==factoryType) {
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returnnewTwoDShapeFactory();
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}elseif (FactoryType.THREE_D_FACTORY ==factoryType) {
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returnnewThreeDShapeFactory();
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}
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returnnull;
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}
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}
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packagesrc.main.java.com.designpatterns.creational.abstractfactory;
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publicenumFactoryType {
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TWO_D_FACTORY,
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THREE_D_FACTORY
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}
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packagesrc.main.java.com.designpatterns.creational.abstractfactory;
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publicclassLineimplementsShape {
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@Override
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publicdoublesurfaceArea(floatradius) {
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return0;
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}
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@Override
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publicShapeTypegetShapeType() {
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returnShapeType.LINE;
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}
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}
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packagesrc.main.java.com.designpatterns.creational.abstractfactory;
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publicinterfaceShape {
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/**
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* calculates the surface area for the shape object
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*
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* @param radius the radius or length of shape whose area is to be calculated
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* @return total surface area for the shape
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*/
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doublesurfaceArea(floatradius);
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/**
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* A property to identity the type of the shape for testing the pattern
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*
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* @return an enum describing the shape type
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*/
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ShapeTypegetShapeType();
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}
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packagesrc.main.java.com.designpatterns.creational.abstractfactory;
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publicenumShapeType {
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LINE,
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CIRCLE,
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SPHERE
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}
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packagesrc.main.java.com.designpatterns.creational.abstractfactory;
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publicclassSphereimplementsShape {
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@Override
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publicdoublesurfaceArea(floatradius) {
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return4 *Math.PI *radius *radius;
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}
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@Override
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publicShapeTypegetShapeType() {
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returnShapeType.SPHERE;
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}
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}
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packagesrc.main.java.com.designpatterns.creational.abstractfactory;
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publicclassThreeDShapeFactoryextendsAbstractShapeFactory {
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@Override
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publicShapegetShape(ShapeTypename) {
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if (ShapeType.SPHERE ==name) {
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returnnewSphere();
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}
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returnnull;
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}
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}
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packagesrc.main.java.com.designpatterns.creational.abstractfactory;
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publicclassTwoDShapeFactoryextendsAbstractShapeFactory {
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@Override
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publicShapegetShape(ShapeTypename) {
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if (ShapeType.LINE ==name) {
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returnnewLine();
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}elseif (ShapeType.CIRCLE ==name) {
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returnnewCircle();
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}
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returnnull;
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}
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}
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packagesrc.test.java.com.designpatterns.creational.abstractfactory;
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importorg.junit.Assert;
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importorg.junit.Test;
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importsrc.main.java.com.designpatterns.creational.abstractfactory.*;
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publicclassAbstractShapeFactoryTest {
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@Test
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publicvoidtestAbstractShapeFactory() {
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StringfailReason ="";
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// Tests for 2-D shape factory
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// Test for Line
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AbstractShapeFactoryshapeFactory =FactoryProvider.getShapeFactory(FactoryType.TWO_D_FACTORY);
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Shapeshape =shapeFactory.getShape(ShapeType.LINE);
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if (shape.getShapeType() !=ShapeType.LINE) {
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failReason +="Could not create an object for LINE.\n";
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}
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if (shape.surfaceArea(5) !=0) {
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failReason +="Surface area of Line is incorrect!.\n";
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}
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// Test for circle
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shape =shapeFactory.getShape(ShapeType.CIRCLE);
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if (shape.getShapeType() !=ShapeType.CIRCLE) {
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failReason +="Could not create an object for CIRCLE.\n";
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}
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if (shape.surfaceArea(9) !=254.46900494077323) {
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failReason +="Surface area of Circle is incorrect!.\n";
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}
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// Test for 3-D shape factory
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// Test for Sphere
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shapeFactory =FactoryProvider.getShapeFactory(FactoryType.THREE_D_FACTORY);
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shape =shapeFactory.getShape(ShapeType.SPHERE);
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if (shape.getShapeType() !=ShapeType.SPHERE) {
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failReason +="Could not create and object for SPHERE.\n";
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}
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if (shape.surfaceArea(6) !=452.3893421169302) {
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failReason +="Surface area of Sphere is incorrect!.\n";
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}
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Assert.assertEquals(failReason,"",failReason);
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}
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}

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