Chapter 04 를 공부하고 테스트 코드를 추가하라 #3

Chapter 04 를 공부하고 테스트 코드를 추가하라

Author: johngrib

src/main/java/com/johngrib/objects/_04_movie_data_system/Customer.java

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+package com.johngrib.objects._04_movie_data_system;
+
+public class Customer {
+  private String name;
+  private String id;
+
+  public Customer(String name, String id) {
+    this.name = name;
+    this.id = id;
+  }
+}

src/main/java/com/johngrib/objects/_04_movie_data_system/DiscountCondition.java

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+package com.johngrib.objects._04_movie_data_system;
+
+import lombok.Builder;
+import lombok.Getter;
+
+import java.time.DayOfWeek;
+import java.time.LocalTime;
+
+public class DiscountCondition {
+  @Getter
+  private DiscountConditionType type;
+  private int sequence;
+  private DayOfWeek dayOfWeek;
+  private LocalTime startTime;
+  private LocalTime endTime;
+
+  public DiscountCondition(DiscountConditionType type, int sequence) {
+    this.type = type;
+    this.sequence = sequence;
+  }
+
+  public DiscountCondition(DiscountConditionType type, DayOfWeek dayOfWeek, LocalTime startTime, LocalTime endTime) {
+    this.type = type;
+    this.dayOfWeek = dayOfWeek;
+    this.startTime = startTime;
+    this.endTime = endTime;
+  }
+
+  public DiscountCondition(DiscountConditionType type, int sequence, DayOfWeek dayOfWeek, LocalTime startTime, LocalTime endTime) {
+    this.type = type;
+    this.sequence = sequence;
+    this.dayOfWeek = dayOfWeek;
+    this.startTime = startTime;
+    this.endTime = endTime;
+  }
+
+  public boolean isDiscountable(DayOfWeek dayOfWeek, LocalTime time) {
+    if (type != DiscountConditionType.PERIOD) {
+      throw new IllegalArgumentException();
+    }
+    return this.dayOfWeek.equals(dayOfWeek)
+            && this.startTime.compareTo(time) <= 0
+            && this.endTime.compareTo(time) >= 0;
+  }
+
+  public boolean isDiscountable(int sequence) {
+    if (type != DiscountConditionType.SEQUENCE) {
+      throw new IllegalArgumentException();
+    }
+    return this.sequence == sequence;
+  }
+}

src/main/java/com/johngrib/objects/_04_movie_data_system/DiscountConditionType.java

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+package com.johngrib.objects._04_movie_data_system;
+
+public enum DiscountConditionType {
+  SEQUENCE, // 순번 조건
+  PERIOD    // 기간 조건
+}

src/main/java/com/johngrib/objects/_04_movie_data_system/Movie.java

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+package com.johngrib.objects._04_movie_data_system;
+
+import com.johngrib.objects._02_movie.Money;
+import lombok.Builder;
+import lombok.Getter;
+
+import java.time.Duration;
+import java.time.LocalDateTime;
+import java.util.List;
+
+@Getter
+public class Movie {
+  private String title;
+  private Duration runningTime;
+  private Money fee;
+  private List<DiscountCondition> discountConditions;
+
+  private MovieType movieType;
+  private Money discountAmount;
+  private double discountPercent;
+
+  @Builder
+  public Movie(String title, Duration runningTime, Money fee, List<DiscountCondition> discountConditions,
+               MovieType movieType, Money discountAmount, double discountPercent) {
+    this.title = title;
+    this.runningTime = runningTime;
+    this.fee = fee;
+    this.discountConditions = discountConditions;
+    this.movieType = movieType;
+    this.discountAmount = discountAmount;
+    this.discountPercent = discountPercent;
+  }
+
+  public Money calculateAmountDiscountedFee() {
+    if (movieType != MovieType.AMOUNT_DISCOUNT) {
+      throw new IllegalArgumentException();
+    }
+    return fee.minus(discountAmount);
+  }
+
+  public Money calculatePercentDiscountedFee() {
+    if (movieType != MovieType.PERCENT_DISCOUNT) {
+      throw new IllegalArgumentException();
+    }
+    return fee.minus(fee.times(discountPercent));
+  }
+
+  public Money calculateNoneDiscountedFee() {
+    if (movieType != MovieType.NONE_DISCOUNT) {
+      throw new IllegalArgumentException();
+    }
+    return fee;
+  }
+
+  /**
+   * 할인 조건을 하나씩 훑어 가면서 할인 조건의 타입을 체크한 다음, 할인 가능 여부를 리턴한다.
+   *
+   * @param whenScreened 상영일시
+   * @param sequence     상영순번
+   * @return 할인 가능하다면 true
+   */
+  public boolean isDiscountable(LocalDateTime whenScreened, int sequence) {
+    for (DiscountCondition condition : discountConditions) {
+      if (condition.getType() == DiscountConditionType.PERIOD) {
+        if (condition.isDiscountable(whenScreened.getDayOfWeek(), whenScreened.toLocalTime())) {
+          return true;
+        }
+      } else {
+        if (condition.isDiscountable(sequence)) {
+          return true;
+        }
+      }
+    }
+    return false;
+  }
+}

src/main/java/com/johngrib/objects/_04_movie_data_system/MovieType.java

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+package com.johngrib.objects._04_movie_data_system;
+
+public enum MovieType {
+  AMOUNT_DISCOUNT,  // 금액 할인 정책
+  PERCENT_DISCOUNT, // 비율 할인 정책
+  NONE_DISCOUNT     // 미적용
+}

src/main/java/com/johngrib/objects/_04_movie_data_system/Reservation.java

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+package com.johngrib.objects._04_movie_data_system;
+
+import com.johngrib.objects._02_movie.Money;
+import lombok.Getter;
+import lombok.Setter;
+
+public class Reservation {
+  @Getter
+  @Setter
+  private Customer customer;
+  @Getter
+  @Setter
+  private Screening screening;
+  @Getter
+  @Setter
+  private Money fee;
+  @Getter
+  @Setter
+  private int audienceCount;
+
+  public Reservation(Customer customer, Screening screening, Money fee, int audienceCount) {
+    this.customer = customer;
+    this.screening = screening;
+    this.fee = fee;
+    this.audienceCount = audienceCount;
+  }
+}

src/main/java/com/johngrib/objects/_04_movie_data_system/ReservationAgency.java

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+package com.johngrib.objects._04_movie_data_system;
+
+import com.johngrib.objects._02_movie.Money;
+
+public class ReservationAgency {
+  public Reservation reserve(Screening screening, Customer customer, int audienceCount) {
+    Money fee = screening.calculateFee(audienceCount);
+    return new Reservation(customer, screening, fee, audienceCount);
+  }
+}

src/main/java/com/johngrib/objects/_04_movie_data_system/Screening.java

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+package com.johngrib.objects._04_movie_data_system;
+
+import com.johngrib.objects._02_movie.Money;
+
+import java.time.LocalDateTime;
+
+public class Screening {
+  private Movie movie;
+  private int sequence;
+  private LocalDateTime whenScreened;
+
+  public Screening(Movie movie, int sequence, LocalDateTime whenScreened) {
+    this.movie = movie;
+    this.sequence = sequence;
+    this.whenScreened = whenScreened;
+  }
+
+  public Money calculateFee(int audienceCount) {
+    switch (movie.getMovieType()) {
+      case AMOUNT_DISCOUNT:
+        if (movie.isDiscountable(whenScreened, sequence)) {
+          return movie.calculateAmountDiscountedFee().times(audienceCount);
+        }
+        break;
+      case PERCENT_DISCOUNT:
+        if (movie.isDiscountable(whenScreened, sequence)) {
+          return movie.calculatePercentDiscountedFee().times(audienceCount);
+        }
+      case NONE_DISCOUNT:
+        return movie.calculateNoneDiscountedFee().times(audienceCount);
+    }
+    return movie.calculateNoneDiscountedFee().times(audienceCount);
+  }
+}