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BAEL-1072 - Difference between Proxy, Decorator, Adapter, and Bridge Patterns (#2390)

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* Structural Design Patterns 

Difference between several types of structural design patterns

* Structural Design Pattern

Difference between several types of structural design patterns

* Structural Design Patterns

Difference between several types of structural design patterns

* Structural Design Patterns

Difference between several types of structural design patterns
This commit is contained in:
ramansahasi
2017-08-08 23:26:53 +05:30
committed by maibin
parent 53433a06d8
commit 415b80d03f
29 changed files with 498 additions and 1 deletions
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13
core-java/src/main/java/com/baeldung/designpatterns/adapter/AdapterPatternDriver.java Normal file
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package com.baeldung.designpatterns.adapter;
import static com.baeldung.designpatterns.util.LogerUtil.LOG;
public class AdapterPatternDriver {
public static void main(String args[]) {
LuxuryCarsSpeedAdapter luxuryCars = new LuxuryCarsSpeedAdapterImpl();
LOG.info("Bugatti Veyron Super Sport's top speed is " + luxuryCars.bugattiVeyronInKMPH() + " Kmph.");
LOG.info("McLaren F1 top speed is " + luxuryCars.mcLarenInKMPH() + " Kmph.");
LOG.info("Aston Martin One-77 top speed is " + luxuryCars.astonMartinInKMPH() + " Kmph.");
}
}

15
core-java/src/main/java/com/baeldung/designpatterns/adapter/LuxuryCarsSpeed.java Normal file
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package com.baeldung.designpatterns.adapter;
public class LuxuryCarsSpeed {
public double bugattiVeyronInMPH() {
return 268;
}
public double mcLarenInMPH() {
return 241;
}
public double astonMartinInMPH() {
return 220;
}
}

7
core-java/src/main/java/com/baeldung/designpatterns/adapter/LuxuryCarsSpeedAdapter.java Normal file
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package com.baeldung.designpatterns.adapter;
public interface LuxuryCarsSpeedAdapter {
public double bugattiVeyronInKMPH();
public double mcLarenInKMPH();
public double astonMartinInKMPH();
}

26
core-java/src/main/java/com/baeldung/designpatterns/adapter/LuxuryCarsSpeedAdapterImpl.java Normal file
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package com.baeldung.designpatterns.adapter;
public class LuxuryCarsSpeedAdapterImpl extends LuxuryCarsSpeed implements LuxuryCarsSpeedAdapter {
@Override
public double bugattiVeyronInKMPH() {
double mph = super.bugattiVeyronInMPH();
return convertMPHtoKMPH(mph);
}
@Override
public double mcLarenInKMPH() {
double mph = super.mcLarenInMPH();
return convertMPHtoKMPH(mph);
}
@Override
public double astonMartinInKMPH() {
double mph = super.astonMartinInMPH();
return convertMPHtoKMPH(mph);
}
private double convertMPHtoKMPH(double mph) {
return mph * 1.60934;
}
}

12
core-java/src/main/java/com/baeldung/designpatterns/bridge/Blue.java Normal file
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package com.baeldung.designpatterns.bridge;
import static com.baeldung.designpatterns.util.LogerUtil.LOG;
public class Blue implements Color {
@Override
public void fillColor() {
LOG.info("Color : Blue");
}
}

14
core-java/src/main/java/com/baeldung/designpatterns/bridge/BridgePatternDriver.java Normal file
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package com.baeldung.designpatterns.bridge;
public class BridgePatternDriver {
public static void main(String[] args) {
//a square with red color
Shape square = new Square(new Red());
square.drawShape();
//a triangle with blue color
Shape triangle = new Triangle(new Blue());
triangle.drawShape();
}
}

5
core-java/src/main/java/com/baeldung/designpatterns/bridge/Color.java Normal file
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package com.baeldung.designpatterns.bridge;
public interface Color {
public void fillColor();
}

12
core-java/src/main/java/com/baeldung/designpatterns/bridge/Red.java Normal file
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package com.baeldung.designpatterns.bridge;
import static com.baeldung.designpatterns.util.LogerUtil.LOG;
public class Red implements Color {
@Override
public void fillColor() {
LOG.info("Color : Red");
}
}

11
core-java/src/main/java/com/baeldung/designpatterns/bridge/Shape.java Normal file
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package com.baeldung.designpatterns.bridge;
public abstract class Shape {
protected Color color;
public Shape(Color color) {
this.color = color;
}
abstract public void drawShape();
}

16
core-java/src/main/java/com/baeldung/designpatterns/bridge/Square.java Normal file
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package com.baeldung.designpatterns.bridge;
import static com.baeldung.designpatterns.util.LogerUtil.LOG;
public class Square extends Shape {
public Square(Color color) {
super(color);
}
@Override
public void drawShape() {
LOG.info("Square drawn. ");
color.fillColor();
}
}

16
core-java/src/main/java/com/baeldung/designpatterns/bridge/Triangle.java Normal file
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package com.baeldung.designpatterns.bridge;
import static com.baeldung.designpatterns.util.LogerUtil.LOG;
public class Triangle extends Shape {
public Triangle(Color color) {
super(color);
}
@Override
public void drawShape() {
LOG.info("Triangle drawn. ");
color.fillColor();
}
}

16
core-java/src/main/java/com/baeldung/designpatterns/decorator/BubbleLights.java Normal file
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package com.baeldung.designpatterns.decorator;
public class BubbleLights extends TreeDecorator {
public BubbleLights(ChristmasTree tree) {
super(tree);
}
public String decorate() {
return super.decorate() + decorateWithBubbleLights();
}
private String decorateWithBubbleLights() {
return " with Bubble Lights";
}
}

5
core-java/src/main/java/com/baeldung/designpatterns/decorator/ChristmasTree.java Normal file
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package com.baeldung.designpatterns.decorator;
public interface ChristmasTree {
public String decorate();
}

10
core-java/src/main/java/com/baeldung/designpatterns/decorator/ChristmasTreeImpl.java Normal file
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package com.baeldung.designpatterns.decorator;
public class ChristmasTreeImpl implements ChristmasTree {
@Override
public String decorate() {
return "Christmas tree";
}
}

20
core-java/src/main/java/com/baeldung/designpatterns/decorator/DecoratorPatternDriver.java Normal file
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package com.baeldung.designpatterns.decorator;
import static com.baeldung.designpatterns.util.LogerUtil.LOG;
public class DecoratorPatternDriver {
public static void main(String[] args) {
//christmas tree with just one Garland
ChristmasTree tree1 = new Garland(new ChristmasTreeImpl());
LOG.info(tree1.decorate());
//christmas tree with two Garlands and one Bubble lights
ChristmasTree tree2 = new BubbleLights(new Garland(
new Garland(new ChristmasTreeImpl()))
);
LOG.info(tree2.decorate());
}
}

16
core-java/src/main/java/com/baeldung/designpatterns/decorator/Garland.java Normal file
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package com.baeldung.designpatterns.decorator;
public class Garland extends TreeDecorator {
public Garland(ChristmasTree tree) {
super(tree);
}
public String decorate() {
return super.decorate() + decorateWithGarland();
}
private String decorateWithGarland() {
return " with Garland";
}
}

15
core-java/src/main/java/com/baeldung/designpatterns/decorator/TreeDecorator.java Normal file
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package com.baeldung.designpatterns.decorator;
public abstract class TreeDecorator implements ChristmasTree {
private ChristmasTree tree;
public TreeDecorator(ChristmasTree tree) {
this.tree = tree;
}
@Override
public String decorate() {
return tree.decorate();
}
}

5
core-java/src/main/java/com/baeldung/designpatterns/proxy/ExpensiveObject.java Normal file
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package com.baeldung.designpatterns.proxy;
public interface ExpensiveObject {
public void process();
}

20
core-java/src/main/java/com/baeldung/designpatterns/proxy/ExpensiveObjectImpl.java Normal file
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package com.baeldung.designpatterns.proxy;
import static com.baeldung.designpatterns.util.LogerUtil.LOG;;
public class ExpensiveObjectImpl implements ExpensiveObject {
public ExpensiveObjectImpl() {
heavyInitialConfiguration();
}
@Override
public void process() {
LOG.info("processing complete.");
}
private void heavyInitialConfiguration() {
LOG.info("Loading initial configuration...");
}
}

13
core-java/src/main/java/com/baeldung/designpatterns/proxy/ExpensiveObjectProxy.java Normal file
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package com.baeldung.designpatterns.proxy;
public class ExpensiveObjectProxy implements ExpensiveObject{
private static ExpensiveObject object;
@Override
public void process() {
if(object == null) {
object = new ExpensiveObjectImpl();
}
object.process();
}
}

9
core-java/src/main/java/com/baeldung/designpatterns/proxy/ProxyPatternDriver.java Normal file
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package com.baeldung.designpatterns.proxy;
public class ProxyPatternDriver {
public static void main(String[] args) {
ExpensiveObject object = new ExpensiveObjectProxy();
object.process();
object.process();
}
}

35
core-java/src/main/java/com/baeldung/designpatterns/util/LogerUtil.java Normal file
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package com.baeldung.designpatterns.util;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Properties;
import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;
public class LogerUtil {
public final static Logger LOG = Logger.getLogger("GLOBAL");
static {
configuration();
}
private static void configuration() {
Properties props = new Properties();
try {
props.load(
new BufferedReader(
new InputStreamReader(
LogerUtil.class.getResourceAsStream("/log4jstructuraldp.properties")
)
)
);
} catch (IOException e) {
System.out.println("log4jstructuraldp.properties file not configured properly");
System.exit(0);
}
PropertyConfigurator.configure(props);
}
}