Move Validate methods

In this merge request, the following is changed:

• The methods validateCourse, validateCourseCode and validateActive are moved from the CourseEditionRepository to the CourseEditionService.
• The method validateNoteExists is moved from the NoteRepository to the NoteService.
• The method validateActive is moved from the ScheduleRepository to the ScheduleService.

src/main/java/nl/tudelft/ewi/tam/repositories/CourseEditionRepository.java

@@ -2,9 +2,6 @@ package nl.tudelft.ewi.tam.repositories;
 
 import nl.tudelft.ewi.tam.JdbcDaoImpl;
 import nl.tudelft.ewi.tam.beans.CourseEdition;
-import nl.tudelft.ewi.tam.exceptions.CourseAlreadyExistsException;
-import nl.tudelft.ewi.tam.exceptions.CourseNotActiveException;
-import nl.tudelft.ewi.tam.exceptions.CourseNotFoundException;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.jdbc.core.BeanPropertyRowMapper;
 import org.springframework.stereotype.Repository;
@@ -216,40 +213,4 @@ public class CourseEditionRepository {
         final int[] argumentTypes = {Types.INTEGER };
         return jdbcDaoImpl.count(CHECK_ACTIVE, arguments, argumentTypes) > 0;
     }
-
-    /**
-     * Validate whether a course exists with the given id.
-     *
-     * @param courseId                  the id of the course to look for
-     * @throws CourseNotFoundException  thrown when the course is not found
-     */
-    public void validateCourse(final int courseId) throws CourseNotFoundException {
-        if (!isCourse(courseId)) {
-            throw new CourseNotFoundException(courseId);
-        }
-    }
-
-    /**
-     * Validate whether the course code is unique.
-     *
-     * @param courseCode                        the course code to verify
-     * @throws CourseAlreadyExistsException     thrown when there already is a course with the given course code
-     */
-    public void validateCourseCode(final String courseCode) throws CourseAlreadyExistsException {
-        if (isCourse(courseCode)) {
-            throw new CourseAlreadyExistsException(courseCode);
-        }
-    }
-
-    /**
-     * Validate whether the course with the given id is active.
-     *
-     * @param courseId                  the id of the course to check
-     * @throws CourseNotActiveException thrown when the course is not active
-     */
-    public void validateActive(final int courseId) throws CourseNotActiveException {
-        if (!isActive(courseId)) {
-            throw new CourseNotActiveException(courseId);
-        }
-    }
 }