Example 2

• this example is an extension of the first example

• cache

  • cache/BundledShapedCache.java

    package refactoring_guru.prototype.caching.cache;
    
    import refactoring_guru.prototype.example.shapes.Circle;
    import refactoring_guru.prototype.example.shapes.Rectangle;
    import refactoring_guru.prototype.example.shapes.Shape;
    
    import java.util.HashMap;
    import java.util.Map;
    
    public class BundledShapeCache {
        private Map<String, Shape> cache = new HashMap<>();
    
        public BundledShapeCache() {
            Circle circle = new Circle();
            circle.x = 5;
            circle.y = 7;
            circle.radius = 45;
            circle.color = "Green";
    
            Rectangle rectangle = new Rectangle();
            rectangle.x = 6;
            rectangle.y = 9;
            rectangle.width = 8;
            rectangle.height = 10;
            rectangle.color = "Blue";
    
            cache.put("Big green circle", circle);
            cache.put("Medium blue rectangle", rectangle);
        }
    
        public Shape put(String key, Shape shape) {
            cache.put(key, shape);
            return shape;
        }
    
        public Shape get(String key) {
            return cache.get(key).clone();
        }
    }

• Demo.java

package refactoring_guru.prototype.caching;

import refactoring_guru.prototype.caching.cache.BundledShapeCache;
import refactoring_guru.prototype.example.shapes.Shape;

public class Demo {
    public static void main(String[] args) {
        BundledShapeCache cache = new BundledShapeCache();

        Shape shape1 = cache.get("Big green circle");
        Shape shape2 = cache.get("Medium blue rectangle");
        Shape shape3 = cache.get("Medium blue rectangle");

        if (shape1 != shape2 && !shape1.equals(shape2)) {
            System.out.println("Big green circle != Medium blue rectangle (yay!)");
        } else {
            System.out.println("Big green circle == Medium blue rectangle (booo!)");
        }

        if (shape2 != shape3) {
            System.out.println("Medium blue rectangles are two different objects (yay!)");
            if (shape2.equals(shape3)) {
                System.out.println("And they are identical (yay!)");
            } else {
                System.out.println("But they are not identical (booo!)");
            }
        } else {
            System.out.println("Rectangle objects are the same (booo!)");
        }
    }
}

Big green circle != Medium blue rectangle (yay!)
Medium blue rectangles are two different objects (yay!)
And they are identical (yay!)