enrollincoursetrans.java

国外的数据结构与算法分析用书

package Transactions;

import Sets.*;
import Entities.*;

/**	Add a new course for a department */
public class EnrollInCourseTrans
{

	public void execute(CallNum callN, Student user)
	{
		CourseSection courseSec = DepartmentSet.getCourseSection(callN);
		if (courseSec != null)
		{
			CourseReg courseReg = new CourseReg(Clock.getDate(), user, "NORMAL");
			StudentReg studReg = new StudentReg(courseReg, callN);
			if (!user.isRegistered(studReg))
			{
				user.registerInCourse(studReg);
				courseSec.addRegistration(courseReg);
			}
			else
				System.out.println("Already registered in this course section. Aborting!");
		}
		else
			System.out.println("Invalid inputs. EnrollInCourseTrans - Aborting!!!");
	}

	public void executeReg(CallNum callN, int studNum)
	{
		Student student = (Student)StudentSet.rep.obtain(new Integer(studNum));
		if (student != null)
			execute(callN, student);
		else
			System.out.println("Invalid inputs. EnrollInCourseTrans - Aborting!!!");	
	}

} /* end of EnrollInCourseTrans */