3단계 - 수강신청(DB 적용)

.gitignore

@@ -31,3 +31,5 @@ out/
 
 ### VS Code ###
 .vscode/
+
+/bin/

src/main/java/nextstep/courses/domain/Capacity.java

@@ -1,5 +1,7 @@
 package nextstep.courses.domain;
 
+import java.util.Objects;
+
 public class Capacity {
     private final int value;
 
@@ -17,4 +19,17 @@ public int getValue() {
     public boolean isFull(int registeredCount) {
         return registeredCount >= value;
     }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (!(o instanceof Capacity)) return false;
+        Capacity capacity = (Capacity) o;
+        return value == capacity.value;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(value);
+    }
 }

src/main/java/nextstep/courses/domain/Image.java

@@ -1,16 +1,16 @@
 package nextstep.courses.domain;
 
 public class Image {
+    private static final int MAX_IMAGE_SIZE = 1024 * 1024;
+    private static final int WIDTH_LIMIT = 300;
+    private static final int HEIGHT_LIMIT = 200;
+    private static final double REQUIRED_ASPECT_RATIO = 1.5;
+    private static final double ASPECT_RATIO_TOLERANCE = 0.01;
     private String fileName;
     private String contentType;
     private long sizeInBytes;
     private int width;
     private int height;
-    private static final int IMAGE_SIZE_1MB = 1024 * 1024;
-    private static final int WIDTH_LIMIT = 300;
-    private static final int HEIGHT_LIMIT = 200;
-    private static final double REQUIRED_ASPECT_RATIO = 1.5;
-    private static final double ASPECT_RATIO_TOLERANCE = 0.01;
 
     public Image(String fileName, String contentType, long sizeInBytes, int width, int height) {
         validate(contentType, sizeInBytes, width, height);
@@ -21,8 +21,24 @@ public Image(String fileName, String contentType, long sizeInBytes, int width, i
         this.height = height;
     }
 
+    public String getFileName() {
+        return fileName;
+    }
+    public String getContentType() {
+        return contentType;
+    }
+    public long getSizeInBytes() {
+        return sizeInBytes;
+    }
+    public int getWidth() {
+        return width;
+    }
+    public int getHeight() {
+        return height;
+    }
+
     private void validate(String contentType, long sizeInBytes, int width, int height) {
-        if (sizeInBytes > IMAGE_SIZE_1MB) {
+        if (sizeInBytes > MAX_IMAGE_SIZE) {
             throw new IllegalArgumentException("이미지 크기는 1MB 이하여야 합니다.");
         }
 

src/main/java/nextstep/courses/domain/PaidSession.java

@@ -13,6 +13,14 @@ public PaidSession(Long id, String name, Period period, Image coverImage,
         this.tuitionFee = new TuitionFee(tuitionFee);
     }
 
+    public Capacity getCapacity() {
+        return maxCapacity;
+    }
+
+    public TuitionFee getTuitionFee() {
+        return tuitionFee;
+    }
+
     @Override
     protected void validateRegistration(Long studentId, Payment payment) {
         if (registeredStudents.size() >= maxCapacity.getValue()) {
@@ -27,7 +35,7 @@ protected void validateRegistration(Long studentId, Payment payment) {
         if (!studentId.equals(payment.getNsUserId())) {
             throw new IllegalArgumentException("결제한 사용자와 일치하지 않습니다.");
         }
-        if (this.tuitionFee.getAmount() != payment.getAmount()) {
+        if (!this.tuitionFee.isSameAmount(payment.getAmount())) {
             throw new IllegalArgumentException("결제 금액과 일치하지 않습니다.");
         }
     }

src/main/java/nextstep/courses/domain/Period.java

@@ -1,6 +1,7 @@
 package nextstep.courses.domain;
 
 import java.time.LocalDate;
+import java.util.Objects;
 
 public class Period {
     private final LocalDate startDate;
@@ -21,4 +22,18 @@ public LocalDate getStartDate() {
     public LocalDate getEndDate() {
         return endDate;
     }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (!(o instanceof Period)) return false;
+        Period period = (Period) o;
+        return Objects.equals(startDate, period.startDate) &&
+                Objects.equals(endDate, period.endDate);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(startDate, endDate);
+    }
 }

src/main/java/nextstep/courses/domain/Session.java

@@ -2,22 +2,53 @@
 
 import nextstep.payments.domain.Payment;
 
-import java.util.HashSet;
-import java.util.Set;
+import java.util.List;
+import java.util.stream.Collectors;
+
 public abstract class Session {
     protected Long id;
     protected String name;
     protected Period period;
     protected Image coverImage;
     protected SessionStatus status;
-    protected Set<Long> registeredStudents = new HashSet<>();
+    protected Students registeredStudents;
 
     public Session(Long id, String name, Period period, Image coverImage, SessionStatus status) {
         this.id = id;
         this.name = name;
         this.period = period;
         this.coverImage = coverImage;
         this.status = status;
+        this.registeredStudents = new Students();
+    }
+    public List<Long> getStudentIds() {
+        return registeredStudents.getStudents().stream()
+                .map(Student::getId)
+                .collect(Collectors.toList());
+    }
+
+    public Students getRegisteredStudent() {
+        return registeredStudents;
+    }
+
+    public Image getCoverImage() {
+        return coverImage;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public Period getPeriod() {
+        return period;
+    }
+
+    public SessionStatus getStatus() {
+        return status;
+    }
+
+    public Long getId() {
+        return id;
     }
 
     public void register(Long studentId, Payment payment) {
@@ -26,11 +57,7 @@ public void register(Long studentId, Payment payment) {
         }
 
         validateRegistration(studentId, payment);
-        registeredStudents.add(studentId);
-    }
-
-    public boolean isRegistered(Long studentId) {
-        return registeredStudents.contains(studentId);
+        registeredStudents.addStudent(new Student(studentId));
     }
 
     protected abstract void validateRegistration(Long studentId, Payment payment);

src/main/java/nextstep/courses/domain/Student.java

@@ -0,0 +1,30 @@
+package nextstep.courses.domain;
+
+public class Student {
+    Long id;
+    public Student() {
+    }
+    public Student(Long id) {
+        this.id = id;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public boolean contains(Long studentId) {
+        return id.equals(studentId);
+    }
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Student student = (Student) o;
+        return id != null && id.equals(student.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return id != null ? id.hashCode() : 0;
+    }
+}

src/main/java/nextstep/courses/domain/Students.java

@@ -0,0 +1,33 @@
+package nextstep.courses.domain;
+
+import java.util.HashSet;
+import java.util.Set;
+import java.util.Collections;
+
+public class Students {
+    private Set<Student> students = new HashSet<>();
+
+    public void addStudent(Student student) {
+        if (contains(student)) {
+            throw new IllegalArgumentException("이미 등록된 학생입니다.");
+        }
+        students.add(student);
+    }
+
+    public void removeStudent(Student student) {
+        students.remove(student);
+    }
+
+    public boolean contains(Student student) {
+        return students.stream()
+                .anyMatch(s -> s.equals(student));
+    }
+
+    public int size() {
+        return students.size();
+    }
+
+    public Set<Student> getStudents() {
+        return Collections.unmodifiableSet(students);
+    }
+}

src/main/java/nextstep/courses/domain/TuitionFee.java

@@ -1,5 +1,7 @@
 package nextstep.courses.domain;
 
+import java.util.Objects;
+
 public class TuitionFee {
     private final int amount;
 
@@ -10,7 +12,24 @@ public TuitionFee(int amount) {
         this.amount = amount;
     }
 
-    public int getAmount() {
+    public boolean isSameAmount(int amount) {
+        return this.amount == amount;
+    }
+
+    public int getValue() {
         return amount;
     }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (!(o instanceof TuitionFee)) return false;
+        TuitionFee that = (TuitionFee) o;
+        return amount == that.amount;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(amount);
+    }
 }