decorator pattern

fishercoder1534 · fishercoder1534 · commit 8e92cd2707ad · 2016-08-06T09:35:42.000-07:00
diff --git a/RandomProblems/src/learnHeadFirstDesignPatterns/chapter_3_decorator_pattern/Beverage.java b/RandomProblems/src/learnHeadFirstDesignPatterns/chapter_3_decorator_pattern/Beverage.java
@@ -0,0 +1,10 @@
+package learnHeadFirstDesignPatterns.chapter_3_decorator_pattern;
+
+import lombok.Getter;
+
+public abstract class Beverage {
+	@Getter
+	String description = "Unknown beverage";
+	
+	public abstract double cost();
+}
diff --git a/RandomProblems/src/learnHeadFirstDesignPatterns/chapter_3_decorator_pattern/CondimentDecorator.java b/RandomProblems/src/learnHeadFirstDesignPatterns/chapter_3_decorator_pattern/CondimentDecorator.java
@@ -0,0 +1,5 @@
+package learnHeadFirstDesignPatterns.chapter_3_decorator_pattern;
+
+public abstract class CondimentDecorator extends Beverage {
+	public abstract String getDescription();
+}
diff --git a/RandomProblems/src/learnHeadFirstDesignPatterns/chapter_3_decorator_pattern/DecoratorPatternTestDrive.java b/RandomProblems/src/learnHeadFirstDesignPatterns/chapter_3_decorator_pattern/DecoratorPatternTestDrive.java
@@ -0,0 +1,32 @@
+package learnHeadFirstDesignPatterns.chapter_3_decorator_pattern;
+
+/**Classes should be open for extension and closed for modification.
+ * 
+ * Decorator pattern: attach additional responsibilities to an object dynamically.*/
+public class DecoratorPatternTestDrive {
+	
+	public static void main(String... args){
+		System.out.println("Program started.");
+		Beverage espresso = new Espresso();
+		print(espresso);
+		
+		Beverage houseBlend = new HouseBlend();
+		houseBlend = new Mocha(houseBlend);
+		print(houseBlend);
+		
+		houseBlend = new Soy(houseBlend);
+		print(houseBlend);
+		
+		houseBlend = new Whip(houseBlend);
+		print(houseBlend);
+		
+		System.out.println("Program ended.");
+	}
+
+	/**
+	 * @param beverage
+	 */
+	protected static void print(Beverage beverage) {
+		System.out.println(beverage.getDescription() + " $" + beverage.cost());
+	}
+}
diff --git a/RandomProblems/src/learnHeadFirstDesignPatterns/chapter_3_decorator_pattern/Espresso.java b/RandomProblems/src/learnHeadFirstDesignPatterns/chapter_3_decorator_pattern/Espresso.java
@@ -0,0 +1,14 @@
+package learnHeadFirstDesignPatterns.chapter_3_decorator_pattern;
+
+public class Espresso extends Beverage {
+
+	public Espresso() {
+		description = "Espresso";
+	}
+	
+	@Override
+	public double cost() {
+		return 1.99;
+	}
+
+}
diff --git a/RandomProblems/src/learnHeadFirstDesignPatterns/chapter_3_decorator_pattern/HouseBlend.java b/RandomProblems/src/learnHeadFirstDesignPatterns/chapter_3_decorator_pattern/HouseBlend.java
@@ -0,0 +1,14 @@
+package learnHeadFirstDesignPatterns.chapter_3_decorator_pattern;
+
+public class HouseBlend extends Beverage {
+
+	public HouseBlend() {
+		description = "House Blend Coffee";
+	}
+	
+	@Override
+	public double cost() {
+		return .89;
+	}
+
+}
diff --git a/RandomProblems/src/learnHeadFirstDesignPatterns/chapter_3_decorator_pattern/Mocha.java b/RandomProblems/src/learnHeadFirstDesignPatterns/chapter_3_decorator_pattern/Mocha.java
@@ -0,0 +1,21 @@
+package learnHeadFirstDesignPatterns.chapter_3_decorator_pattern;
+
+public class Mocha extends CondimentDecorator {
+
+	Beverage beverage;	
+	
+	public Mocha(Beverage beverage){
+		this.beverage = beverage;
+	}
+	
+	@Override
+	public String getDescription() {
+		return beverage.getDescription() + ", Mocha";
+	}
+
+	@Override
+	public double cost() {
+		return .20 + beverage.cost();
+	}
+
+}
diff --git a/RandomProblems/src/learnHeadFirstDesignPatterns/chapter_3_decorator_pattern/Soy.java b/RandomProblems/src/learnHeadFirstDesignPatterns/chapter_3_decorator_pattern/Soy.java
@@ -0,0 +1,21 @@
+package learnHeadFirstDesignPatterns.chapter_3_decorator_pattern;
+
+public class Soy extends CondimentDecorator {
+
+	Beverage beverage;
+	
+	public Soy(Beverage beverage){
+		this.beverage = beverage;
+	}
+	
+	@Override
+	public String getDescription() {
+		return beverage.getDescription() + ", Soy";
+	}
+
+	@Override
+	public double cost() {
+		return .99 + beverage.cost();
+	}
+
+}
diff --git a/RandomProblems/src/learnHeadFirstDesignPatterns/chapter_3_decorator_pattern/Whip.java b/RandomProblems/src/learnHeadFirstDesignPatterns/chapter_3_decorator_pattern/Whip.java
@@ -0,0 +1,21 @@
+package learnHeadFirstDesignPatterns.chapter_3_decorator_pattern;
+
+public class Whip extends CondimentDecorator {
+
+	Beverage beverage;
+	
+	public Whip (Beverage beverage) {
+		this.beverage = beverage;
+	}
+	
+	@Override
+	public String getDescription() {
+		return beverage.getDescription() + ", Whip";
+	}
+
+	@Override
+	public double cost() {
+		return .77 + beverage.cost();
+	}
+
+}
