backend/buisnesslogic/src/main/java/com/plannaplan/services/CourseService.java

package com.plannaplan.services;

import java.util.List;
import java.util.Optional;

import com.plannaplan.entities.Course;
import com.plannaplan.repositories.CourseRepository;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * Service of CourseService which can get(Course By Name, All Courses, Courses
 * Ammount ), save, delete course.
 */

@Service
public class CourseService {
    @Autowired
    private CourseRepository repo;

    /**
     * getCourseByName
     * 
     * @param name name of course to be found
     * @return Course By Name
     */
    public Optional<Course> getCourseByName(String name) {
        return this.repo.findByName(name);
    }

    /**
     * 
     * @return all courses from db
     */
    public List<Course> getAllCourses() {
        return this.repo.findAll();
    }

    /**
     * save to db
     * 
     * @param course which course you would like to save
     * @return Course instance with id from db
     */
    public Course save(Course course) {
        this.repo.save(course);
        return course;
    }

    /**
     * delete course from db
     * 
     * @param course which course you would like to delete
     */
    public void delete(Course course) {
        this.repo.delete(course);
    }

    /**
     * @return ammount of courses in db
     */
    public int getCoursesAmmount() {
        return (int) this.repo.count();
    }
}