Chapter 11 을 공부하라 #8

Chapter 11 을 공부하라
johngrib · Apr 12, 2020 · caf4830 · caf4830
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diff --git a/src/main/java/com/johngrib/objects/_11_call/AdditionalRatePolicy.java b/src/main/java/com/johngrib/objects/_11_call/AdditionalRatePolicy.java
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+package com.johngrib.objects._11_call;
+
+import com.johngrib.objects._02_movie.Money;
+
+public abstract class AdditionalRatePolicy implements RatePolicy {
+  private RatePolicy next;
+
+  public AdditionalRatePolicy(RatePolicy next) {
+    this.next = next;
+  }
+
+  @Override
+  public Money calculateFee(Phone phone) {
+    Money fee = next.calculateFee(phone);
+    return afterCalculated(fee);
+  }
+
+  protected abstract Money afterCalculated(Money fee);
+}
diff --git a/src/main/java/com/johngrib/objects/_11_call/BasicRatePolicy.java b/src/main/java/com/johngrib/objects/_11_call/BasicRatePolicy.java
@@ -0,0 +1,17 @@
+package com.johngrib.objects._11_call;
+
+import com.johngrib.objects._02_movie.Money;
+
+public abstract class BasicRatePolicy implements RatePolicy {
+  @Override
+  public Money calculateFee(Phone phone) {
+    Money result = Money.ZERO;
+
+    for (Call call : phone.getCalls()) {
+      result.plus(calculateCallFee(call));
+    }
+    return result;
+  }
+
+  protected abstract Money calculateCallFee(Call call);
+}
diff --git a/src/main/java/com/johngrib/objects/_11_call/Call.java b/src/main/java/com/johngrib/objects/_11_call/Call.java
@@ -0,0 +1,24 @@
+package com.johngrib.objects._11_call;
+
+import lombok.Getter;
+
+import java.time.Duration;
+import java.time.LocalDateTime;
+
+/**
+ * 개별 통화 시간.
+ */
+public class Call {
+  @Getter
+  private LocalDateTime from;
+  private LocalDateTime to;
+
+  public Call(LocalDateTime from, LocalDateTime to) {
+    this.from = from;
+    this.to = to;
+  }
+
+  public Duration getDuration() {
+    return Duration.between(from, to);
+  }
+}
diff --git a/src/main/java/com/johngrib/objects/_11_call/NightlyDiscountPolicy.java b/src/main/java/com/johngrib/objects/_11_call/NightlyDiscountPolicy.java
@@ -0,0 +1,27 @@
+package com.johngrib.objects._11_call;
+
+import com.johngrib.objects._02_movie.Money;
+
+import java.time.Duration;
+
+public class NightlyDiscountPolicy extends BasicRatePolicy {
+  private static final int LATE_NIGHT_HOUR = 22;
+
+  private Money nightlyAmount;
+  private Money regularAmount;
+  private Duration seconds;
+
+  public NightlyDiscountPolicy(Money nightlyAmount, Money regularAmount, Duration seconds) {
+    this.nightlyAmount = nightlyAmount;
+    this.regularAmount = regularAmount;
+    this.seconds = seconds;
+  }
+
+  @Override
+  protected Money calculateCallFee(Call call) {
+    if (call.getFrom().getHour() >= LATE_NIGHT_HOUR) {
+      return nightlyAmount.times(call.getDuration().getSeconds() / seconds.getSeconds());
+    }
+    return regularAmount.times(call.getDuration().getSeconds() / seconds.getSeconds());
+  }
+}
diff --git a/src/main/java/com/johngrib/objects/_11_call/Phone.java b/src/main/java/com/johngrib/objects/_11_call/Phone.java
@@ -0,0 +1,26 @@
+package com.johngrib.objects._11_call;
+
+import com.johngrib.objects._02_movie.Money;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+public class Phone {
+  private RatePolicy ratePolicy;
+
+  /** 전체 통화 목록 */
+  private List<Call> calls = new ArrayList<>();
+
+  public Phone(RatePolicy ratePolicy) {
+    this.ratePolicy = ratePolicy;
+  }
+
+  public List<Call> getCalls() {
+    return Collections.unmodifiableList(calls);
+  }
+
+  public Money calculateFee() {
+    return ratePolicy.calculateFee(this);
+  }
+}
diff --git a/src/main/java/com/johngrib/objects/_11_call/RateDiscountablePolicy.java b/src/main/java/com/johngrib/objects/_11_call/RateDiscountablePolicy.java
@@ -0,0 +1,17 @@
+package com.johngrib.objects._11_call;
+
+import com.johngrib.objects._02_movie.Money;
+
+public class RateDiscountablePolicy extends AdditionalRatePolicy {
+  private Money discountAmount;
+
+  public RateDiscountablePolicy(Money discountAmount, RatePolicy next) {
+    super(next);
+    this.discountAmount = discountAmount;
+  }
+
+  @Override
+  protected Money afterCalculated(Money fee) {
+    return fee.minus(discountAmount);
+  }
+}
diff --git a/src/main/java/com/johngrib/objects/_11_call/RatePolicy.java b/src/main/java/com/johngrib/objects/_11_call/RatePolicy.java
@@ -0,0 +1,7 @@
+package com.johngrib.objects._11_call;
+
+import com.johngrib.objects._02_movie.Money;
+
+public interface RatePolicy {
+  Money calculateFee(Phone phone);
+}
diff --git a/src/main/java/com/johngrib/objects/_11_call/RegularPolicy.java b/src/main/java/com/johngrib/objects/_11_call/RegularPolicy.java
@@ -0,0 +1,20 @@
+package com.johngrib.objects._11_call;
+
+import com.johngrib.objects._02_movie.Money;
+
+import java.time.Duration;
+
+public class RegularPolicy extends BasicRatePolicy {
+  public Money amount;
+  private Duration seconds;
+
+  public RegularPolicy(Money amount, Duration seconds) {
+    this.amount = amount;
+    this.seconds = seconds;
+  }
+
+  @Override
+  protected Money calculateCallFee(Call call) {
+    return amount.times(call.getDuration().getSeconds() / seconds.getSeconds());
+  }
+}
diff --git a/src/main/java/com/johngrib/objects/_11_call/TaxablePolicy.java b/src/main/java/com/johngrib/objects/_11_call/TaxablePolicy.java
@@ -0,0 +1,17 @@
+package com.johngrib.objects._11_call;
+
+import com.johngrib.objects._02_movie.Money;
+
+public class TaxablePolicy extends AdditionalRatePolicy {
+  private double taxRatio;
+
+  public TaxablePolicy(double taxRatio, RatePolicy next) {
+    super(next);
+    taxRatio = taxRatio;
+  }
+
+  @Override
+  protected Money afterCalculated(Money fee) {
+    return fee.plus(fee.times(taxRatio));
+  }
+}
diff --git a/src/test/java/com/johngrib/objects/_11_call/PhoneTest.java b/src/test/java/com/johngrib/objects/_11_call/PhoneTest.java
@@ -0,0 +1,76 @@
+package com.johngrib.objects._11_call;
+
+import com.johngrib.objects._02_movie.Money;
+import org.junit.jupiter.api.DisplayName;
+
+import java.time.Duration;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+@DisplayName("Phone")
+class PhoneTest {
+
+  // 일반 요금제의 규칙에 따라 통화 요금을 계산하는 전화
+  Phone regularPolicyPhone() {
+    return new Phone(
+            new RegularPolicy(
+                    Money.wons(10),
+                    Duration.ofSeconds(10)));
+  }
+
+  // 심야 할인 요금제의 규칙에 따라 통화 요금을 계산하는 전화
+  Phone nightlyDiscountPolicyPhone() {
+    return new Phone(
+            new NightlyDiscountPolicy(
+                    Money.wons(5),
+                    Money.wons(10),
+                    Duration.ofSeconds(10)));
+  }
+
+  // 일반 요금제에 세금 정책을 조합할 경우의 Phone 인스턴스를 생성하는 방법
+  Phone taxableRegularPolicyPhone() {
+    return new Phone(
+            new TaxablePolicy(  // 세금 정책
+                    0.05,
+                    new RegularPolicy(  // 일반 요금제
+                            Money.wons(10),
+                            Duration.ofSeconds(10))));
+  }
+
+  // 일반 요금제에 기본 요금 할인 정책을 조합한 결과에 세금 정책을 조합하는 방법
+  Phone regularRateDiscountTaxablePhone() {
+    return new Phone(
+            new TaxablePolicy(  // 세금 정책
+                    0.05,
+                    new RateDiscountablePolicy( // 기본 요금 할인 정책
+                            Money.wons(1000),
+                            new RegularPolicy(  // 일반 요금제
+                                    Money.wons(10),
+                                    Duration.ofSeconds(10)))));
+  }
+
+  // 순서를 바꾸는 것도 가능하다
+  Phone regularRateDiscountTaxablePhone1() {
+    return new Phone(
+            new RateDiscountablePolicy( // 기본 요금 할인 정책
+                    Money.wons(1000),
+                    new TaxablePolicy(  // 세금 정책
+                            0.05,
+                            new RegularPolicy(  // 일반 요금제
+                                    Money.wons(10),
+                                    Duration.ofSeconds(10)))));
+  }
+
+  // 같은 정책을 심야 할인 요금제에도 적용
+  Phone rateDiscountNightlyPhone() {
+    return new Phone(
+            new RateDiscountablePolicy(
+                    Money.wons(1000),
+                    new TaxablePolicy(
+                            0.05,
+                            new NightlyDiscountPolicy(
+                                    Money.wons(5),
+                                    Money.wons(10),
+                                    Duration.ofSeconds(10)))));
+  }
+}