Spring in action 源代码

package com.springinaction.training.service; import java.util.Iterator; import java.util.Set; import org.apache.log4j.Logger; import org.springframework.mail.MailException; import org.springframework.mail.MailSender; import org.springframework.mail.SimpleMailMessage; import com.springinaction.training.CourseException; import com.springinaction.training.dao.CourseDao; import com.springinaction.training.model.Course; import com.springinaction.training.model.Student; public class CourseServiceImpl implements CourseService { private static Logger LOGGER = Logger.getLogger(CourseServiceImpl.class); public CourseServiceImpl(CourseDao dao) { this.courseDao = dao; } public Course getCourse(int id) { return getCourse(new Integer(id)); } public Course getCourse(Integer id) { return courseDao.findById(id); } public void saveCourse(Course course) { courseDao.save(course); } public void enrollStudentInCourse(Course course, Student student) throws CourseException { // TODO: enforcePrerequisites(course, student); // TODO: Check for schedule conflicts course.getStudents().add(student); courseDao.save(course); } public Set getAllCourses() { return courseDao.findAll(); } public void sendCourseEnrollmentReport() { Set courseList = courseDao.findAll(); SimpleMailMessage message = new SimpleMailMessage(this.mailMessage); StringBuffer messageText = new StringBuffer(); messageText.append("Current enrollment data is as follows:\n\n"); for(Iterator iter = courseList.iterator(); iter.hasNext(); ) { Course course = (Course) iter.next(); messageText.append(course.getId() + " "); messageText.append(course.getName() + " "); int enrollment = courseDao.getEnrollment(course); messageText.append(enrollment); } message.setText(messageText.toString()); try { mailSender.send(message); } catch (MailException e) { LOGGER.error(e.getMessage()); } } private void enforcePrerequisites(Course course, Student student) throws CourseException { Set completed = studentService.getCompletedCourses(student); // Check for prerequesites Set prereqs = course.getPrerequisites(); for(Iterator iter = prereqs.iterator(); iter.hasNext(); ) { if(!completed.contains(iter.next())) { throw new CourseException("Prerequisites are not met."); } } // Check for scheduling clash for(Iterator iter = completed.iterator(); iter.hasNext(); ) { Course completedCourse = (Course) iter.next(); } } // COLLABORATORS private CourseDao courseDao; public void setCourseDao(CourseDao courseDao) { this.courseDao = courseDao; } private StudentService studentService; public void setStudentService(StudentService service) { this.studentService = service; } private MailSender mailSender; public void setMailSender(MailSender mailSender) { this.mailSender = mailSender; } private SimpleMailMessage mailMessage; public void setMailMessage(SimpleMailMessage mailMessage) { this.mailMessage = mailMessage; } }