From 17aace8fa69c48c1b987a4ddf0f01d99ddee0fd9 Mon Sep 17 00:00:00 2001
From: chuyan <1047381936@qq.com>
Date: Fri, 11 Sep 2020 20:35:05 +0800
Subject: [PATCH] =?UTF-8?q?CalculationService=E6=9E=84=E5=BB=BA=EF=BC=8C?=
 =?UTF-8?q?=E6=9C=89=E5=BE=85=E5=AE=B6=E9=95=BF=E7=9B=B8=E5=85=B3=E7=9A=84?=
 =?UTF-8?q?=E5=AE=8C=E5=96=84?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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---
 .../controller/student/StudentController.java | 11 +++
 .../ase/repository/student/SCRepository.java  | 15 ----
 .../ase/service/ActivityService.java          |  2 +-
 .../ase/service/CalculationService.java       | 84 +++++++++++++++++++
 4 files changed, 96 insertions(+), 16 deletions(-)
 create mode 100644 src/main/java/com/codesdream/ase/controller/student/StudentController.java
 delete mode 100644 src/main/java/com/codesdream/ase/repository/student/SCRepository.java
 create mode 100644 src/main/java/com/codesdream/ase/service/CalculationService.java

diff --git a/src/main/java/com/codesdream/ase/controller/student/StudentController.java b/src/main/java/com/codesdream/ase/controller/student/StudentController.java
new file mode 100644
index 0000000..c3c61a5
--- /dev/null
+++ b/src/main/java/com/codesdream/ase/controller/student/StudentController.java
@@ -0,0 +1,11 @@
+package com.codesdream.ase.controller.student;
+
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("student")
+public class StudentController {
+
+    public 
+}
diff --git a/src/main/java/com/codesdream/ase/repository/student/SCRepository.java b/src/main/java/com/codesdream/ase/repository/student/SCRepository.java
deleted file mode 100644
index 4b170a4..0000000
--- a/src/main/java/com/codesdream/ase/repository/student/SCRepository.java
+++ /dev/null
@@ -1,15 +0,0 @@
-package com.codesdream.ase.repository.student;
-
-import com.codesdream.ase.model.student.StudentCourse;
-import org.springframework.data.domain.Sort;
-import org.springframework.data.jpa.repository.JpaRepository;
-import org.springframework.stereotype.Repository;
-
-import java.util.List;
-
-@Repository
-public interface SCRepository extends JpaRepository<StudentCourse, Integer> {
-
-    List<StudentCourse> findByStudentId(String studentId);
-    List<StudentCourse> findByStudentId(String studentId, Sort sort);
-}
diff --git a/src/main/java/com/codesdream/ase/service/ActivityService.java b/src/main/java/com/codesdream/ase/service/ActivityService.java
index 17dcf0e..73a0c00 100644
--- a/src/main/java/com/codesdream/ase/service/ActivityService.java
+++ b/src/main/java/com/codesdream/ase/service/ActivityService.java
@@ -171,7 +171,7 @@ public class ActivityService {
      * @exception NotFoundException 对应activityId在数据库中无记录
      * @see NotFoundException
      * @param activityId
-     * @return
+     * @return 对应活动实例
      */
     private Activity getActivity(int activityId){
         Optional<Activity> optionalActivity = activityRepository.findById(activityId);
diff --git a/src/main/java/com/codesdream/ase/service/CalculationService.java b/src/main/java/com/codesdream/ase/service/CalculationService.java
new file mode 100644
index 0000000..72c0ed1
--- /dev/null
+++ b/src/main/java/com/codesdream/ase/service/CalculationService.java
@@ -0,0 +1,84 @@
+package com.codesdream.ase.service;
+
+import com.codesdream.ase.exception.notfound.NotFoundException;
+import com.codesdream.ase.model.student.Course;
+import com.codesdream.ase.model.student.Student;
+import com.codesdream.ase.model.student.StudentCourse;
+import com.codesdream.ase.repository.student.CourseRepository;
+import com.codesdream.ase.repository.student.StudentCourseRepository;
+import com.codesdream.ase.repository.student.StudentRepository;
+
+import javax.annotation.Resource;
+import java.util.List;
+import java.util.Optional;
+
+public class CalculationService {
+    @Resource
+    StudentRepository studentRepository;
+
+    @Resource
+    StudentCourseRepository studentCourseRepository;
+
+    @Resource
+    CourseRepository courseRepository;
+
+    /**
+     * 用于计算指定学生的学分绩
+     * @exception NotFoundException 课程或学生id无效
+     * @param studentId 学生id
+     * @return 计算好的学分绩
+     */
+    public float calculateGPA(int studentId){
+        if(checkStudentExistence(studentId)){
+            throw new NotFoundException("No such student.");
+        }
+        List<StudentCourse> studentCourses = studentCourseRepository.findByStudentId(studentId);
+
+        float sum = 0f;
+        float credits = 0f;
+        for (StudentCourse studentCourse : studentCourses){
+
+            Optional<Course> optionalCourse = courseRepository.findById(studentCourse.getCourseId());
+            if(!optionalCourse.isPresent()){
+                throw new NotFoundException("No such course.");
+            }
+            Course course = optionalCourse.get();
+            sum += studentCourse.getScore() * course.getCredit();
+            credits += course.getCredit();
+        }
+        return sum / credits;
+    }
+
+    public float calculateAttendanceRate(int studentId, int term){
+        //Todo
+        return -1;
+    }
+
+    public float sumUpStudentAbsence (int studentId, int term){
+        //Todo
+        return -1;
+    }
+
+    public float calculateConcernRate(int parentId){
+        //Todo
+        return -1;
+    }
+
+    public float calculateGradeChange(int studentId){
+        //Todo
+        return -1;
+    }
+
+    /**
+     * 私有方法用于判断学生id是否有效
+     * @param studentId 学生id
+     * @return 是否有效
+     */
+    private boolean checkStudentExistence(int studentId){
+        Optional<Student> optionalStudent = studentRepository.findById(studentId);
+        if(!optionalStudent.isPresent()){
+            return false;
+        }
+        return true;
+    }
+}