レンタルポイント算出をリファクタリング

src/main/java/video/domain/Movie.java

@@ -27,4 +27,7 @@ public int amount(int daysRented) {
         return priceType.amount(daysRented);
     }
 
+    public int frequentRenterPoints(int daysRented) {
+        return priceType.frequentRenterPoints(daysRented);
+    }
 }

src/main/java/video/domain/PriceType.java

@@ -1,22 +1,32 @@
 package video.domain;
 
+import video.domain.point.ChildrenPoint;
+import video.domain.point.NewReleasePoint;
+import video.domain.point.Point;
+import video.domain.point.RegularPoint;
 import video.domain.price.ChildrenPrice;
 import video.domain.price.NewReleasePrice;
 import video.domain.price.Price;
 import video.domain.price.RegularPrice;
 
 public enum PriceType {
-    CHILDREN(new ChildrenPrice()),
-    REGULAR(new RegularPrice()),
-    NEW_RELEASE(new NewReleasePrice());
+    CHILDREN(new ChildrenPrice(), new ChildrenPoint()),
+    REGULAR(new RegularPrice(), new RegularPoint()),
+    NEW_RELEASE(new NewReleasePrice(), new NewReleasePoint());
 
     Price price;
+    Point point;
 
-    PriceType(Price price) {
+    PriceType(Price price, Point point) {
         this.price = price;
+        this.point = point;
     }
 
     int amount(int daysRented) {
         return price.amount(daysRented);
     }
+
+    public int frequentRenterPoints(int daysRented) {
+        return point.frequentRenterPoints(daysRented);
+    }
 }

src/main/java/video/domain/point/ChildrenPoint.java

@@ -0,0 +1,8 @@
+package video.domain.point;
+
+public class ChildrenPoint implements Point {
+    @Override
+    public int frequentRenterPoints(int daysRented) {
+        return 1;
+    }
+}

src/main/java/video/domain/point/NewReleasePoint.java

@@ -0,0 +1,10 @@
+package video.domain.point;
+
+public class NewReleasePoint implements Point {
+    @Override
+    public int frequentRenterPoints(int daysRented) {
+        // 新作を二日以上借りた場合はボーナスポイント
+        if (daysRented > 1) return 2;
+        return 1;
+    }
+}

src/main/java/video/domain/point/Point.java

@@ -0,0 +1,5 @@
+package video.domain.point;
+
+public interface Point {
+    int frequentRenterPoints(int daysRented);
+}

src/main/java/video/domain/point/RegularPoint.java

@@ -0,0 +1,8 @@
+package video.domain.point;
+
+public class RegularPoint implements Point {
+    @Override
+    public int frequentRenterPoints(int daysRented) {
+        return 1;
+    }
+}

src/main/java/video/domain/rental/Rental.java

@@ -1,7 +1,6 @@
 package video.domain.rental;
 
 import video.domain.Movie;
-import video.domain.PriceType;
 
 public class Rental {
 
@@ -28,9 +27,6 @@ public int amount() {
     }
 
     public int frequentRenterPoints() {
-        // 新作を二日以上借りた場合はボーナスポイント
-        if ((getMovie().getPriceType() == PriceType.NEW_RELEASE) &&
-            getDaysRented() > 1) return 2;
-        return 1;
+        return movie.frequentRenterPoints(daysRented);
     }
 }