Step2

README.md

@@ -1,11 +1,18 @@
 # 학습 관리 시스템(Learning Management System)
-## 질문 삭제하기 요구사항
+## 2단계 - 수강신청(도메인 모델)
+### 수강 신청 기능 요구사항
+* 과정(Course)은 기수 단위로 운영하며, 여러 개의 강의(Session)를 가질 수 있다.
+* 강의는 시작일과 종료일을 가진다.
+* 강의는 강의 커버 이미지 정보를 가진다.
+* 이미지 크기는 1MB 이하여야 한다.
+* 이미지 타입은 gif, jpg(jpeg 포함),, png, svg만 허용한다.
+* 이미지의 width는 300픽셀, height는 200픽셀 이상이어야 하며, width와 height의 비율은 3:2여야 한다.
+* 강의는 무료 강의와 유료 강의로 나뉜다.
+* 무료 강의는 최대 수강 인원 제한이 없다.
+* 유료 강의는 강의 최대 수강 인원을 초과할 수 없다.
+* 유료 강의는 수강생이 결제한 금액과 수강료가 일치할 때 수강 신청이 가능하다.
+* 강의 상태는 준비중, 모집중, 종료 3가지 상태를 가진다.
+* 강의 수강신청은 강의 상태가 모집중일 때만 가능하다.
+* 유료 강의의 경우 결제는 이미 완료한 것으로 가정하고 이후 과정을 구현한다.
+* 결제를 완료한 결제 정보는 payments 모듈을 통해 관리되며, 결제 정보는 Payment 객체에 담겨 반한된다.
 ---
-* [x] 질문 데이터를 완전히 삭제하는 것이 아니라 데이터의 상태를 삭제 상태(deleted - boolean type)로 변경한다.
-* [x] 로그인 사용자와 질문한 사람이 같은 경우 삭제 가능하다.
-* [x] 답변이 없는 경우 삭제가 가능하다.
-* [x] 답변을 삭제할 수 있다.
-* [x] 질문자와 답변글의 모든 답변자가 같은 경우 삭제가 가능하다.
-* [x] 질문을 삭제할 때 답변 또한 삭제해야 하며, 답변의 삭제 또한 삭제 상태(deleted)를 변경한다.
-* [x] 질문과 답변 삭제 이력에 대한 정보를 DeleteHistory를 활용해 남긴다.
----

gradlew.bat

@@ -1,89 +1,89 @@
-@rem
-@rem Copyright 2015 the original author or authors.
-@rem
-@rem Licensed under the Apache License, Version 2.0 (the "License");
-@rem you may not use this file except in compliance with the License.
-@rem You may obtain a copy of the License at
-@rem
-@rem      https://www.apache.org/licenses/LICENSE-2.0
-@rem
-@rem Unless required by applicable law or agreed to in writing, software
-@rem distributed under the License is distributed on an "AS IS" BASIS,
-@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-@rem See the License for the specific language governing permissions and
-@rem limitations under the License.
-@rem
-
-@if "%DEBUG%" == "" @echo off
-@rem ##########################################################################
-@rem
-@rem  Gradle startup script for Windows
-@rem
-@rem ##########################################################################
-
-@rem Set local scope for the variables with windows NT shell
-if "%OS%"=="Windows_NT" setlocal
-
-set DIRNAME=%~dp0
-if "%DIRNAME%" == "" set DIRNAME=.
-set APP_BASE_NAME=%~n0
-set APP_HOME=%DIRNAME%
-
-@rem Resolve any "." and ".." in APP_HOME to make it shorter.
-for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
-
-@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
-
-@rem Find java.exe
-if defined JAVA_HOME goto findJavaFromJavaHome
-
-set JAVA_EXE=java.exe
-%JAVA_EXE% -version >NUL 2>&1
-if "%ERRORLEVEL%" == "0" goto execute
-
-echo.
-echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
-
-goto fail
-
-:findJavaFromJavaHome
-set JAVA_HOME=%JAVA_HOME:"=%
-set JAVA_EXE=%JAVA_HOME%/bin/java.exe
-
-if exist "%JAVA_EXE%" goto execute
-
-echo.
-echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
-
-goto fail
-
-:execute
-@rem Setup the command line
-
-set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
-
-
-@rem Execute Gradle
-"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
-
-:end
-@rem End local scope for the variables with windows NT shell
-if "%ERRORLEVEL%"=="0" goto mainEnd
-
-:fail
-rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
-rem the _cmd.exe /c_ return code!
-if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
-exit /b 1
-
-:mainEnd
-if "%OS%"=="Windows_NT" endlocal
-
-:omega
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

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

@@ -1,6 +1,7 @@
 package nextstep.courses.domain;
 
 import java.time.LocalDateTime;
+import java.util.List;
 
 public class Course {
     private Long id;
@@ -13,9 +14,15 @@ public class Course {
 
     private LocalDateTime updatedAt;
 
+    private List<Session> sessions;
+
     public Course() {
     }
 
+    public Course(List<Session> sessions) {
+        this.sessions = sessions;
+    }
+
     public Course(String title, Long creatorId) {
         this(0L, title, creatorId, LocalDateTime.now(), null);
     }
@@ -40,6 +47,10 @@ public LocalDateTime getCreatedAt() {
         return createdAt;
     }
 
+    public List<Session> getSessions() {
+        return sessions;
+    }
+
     @Override
     public String toString() {
         return "Course{" +

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

@@ -0,0 +1,20 @@
+package nextstep.courses.domain;
+
+public class Enrolment {
+    private final Session session;
+
+    public Enrolment(Session session) {
+        this.session = session;
+    }
+
+    public void register() {
+        validateSessionStatus();
+        session.addStudent();
+    }
+
+    private void validateSessionStatus() {
+        if (!session.isSessionStatus().isSessionResult()) {
+            throw new IllegalArgumentException();
+        }
+    }
+}

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

@@ -0,0 +1,7 @@
+package nextstep.courses.domain;
+
+public class FreeSession extends Session {
+    public FreeSession(int studentCount, int tuition) {
+        super(studentCount, tuition);
+    }
+}

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

@@ -0,0 +1,51 @@
+package nextstep.courses.domain;
+
+public class Image {
+    private String type;
+    private int width;
+    private int height;
+
+    public Image() {
+    }
+
+    public Image(String type, int width, int height) {
+        validateImage(type, width, height);
+        this.type = type;
+        this.width = width;
+        this.height = height;
+    }
+
+    public String getType() {
+        return type;
+    }
+
+    public int getWidth() {
+        return width;
+    }
+
+    public int getHeight() {
+        return height;
+    }
+
+    private static void validateImage(String type, int width, int height) {
+        if (width * height > 1024 * 1024) {
+            throw new IllegalArgumentException("이미지 크기는 1MB 이하여야 한다.");
+        }
+
+        if (!(type.contains("gif") || type.contains("jpg") || type.contains("jpeg") || type.contains("png") || type.contains("svg"))) {
+            throw new IllegalArgumentException("이미지 타입은 gif, jpg(jpeg 포함),, png, svg만 허용한다.");
+        }
+
+        if (width < 300) {
+            throw new IllegalArgumentException("이미지 넓이는 300px 이상이여야 한다.");
+        }
+
+        if (height < 200) {
+            throw new IllegalArgumentException("이미지 높이는 200px 이상이여야 한다.");
+        }
+
+        if (width / height != 3 / 2) {
+            throw new IllegalArgumentException("넓이와 높이의 비율은 3:2여야 한다.");
+        }
+    }
+}

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

@@ -0,0 +1,32 @@
+package nextstep.courses.domain;
+
+public class PaidSession extends Session {
+    private static final int PAID_SESSION_TUITION_FEE = 10000;
+    private static final int MAX_SESSION_STUDENT_COUNT = 5;
+
+    public PaidSession(int tuition) {
+        super(tuition);
+        validateTuitionFee(tuition);
+    }
+
+    public PaidSession(SessionStatus sessionStatus) {
+        super(sessionStatus);
+    }
+
+    public PaidSession(int studentCount, int tuition) {
+        super(studentCount, tuition);
+        validateStudentCount(studentCount);
+    }
+
+    private void validateTuitionFee(int tuition) {
+        if (tuition != PAID_SESSION_TUITION_FEE) {
+            throw new IllegalArgumentException();
+        }
+    }
+
+    private void validateStudentCount(int studentCount) {
+        if (studentCount > MAX_SESSION_STUDENT_COUNT) {
+            throw new IllegalArgumentException();
+        }
+    }
+}