studentcontroller.java

国外的数据结构与算法分析用书

package Controllers;

import Entities.*;
import Interfaces.*;
import Transactions.*;

/**	Obtains a sequence of student transactions and executes them. */
public class StudentController implements UserController
{

	protected StudentInterface inter;

	/**	For the registrar accessing the system, read in a
		transaction and execute it */
	public void initiate(Person newUser)
	{
		inter = new StudentInterface();
		int transId = 0;
		CallNum callNum = null;
		Student user = (Student)newUser; 
		if (user != null)
		{
			do
			{
				transId = inter.getCommandID();
				
				switch (transId)
				{
					case 1:
						callNum = inter.getCallNum();
						EnrollInCourseTrans t1 = new EnrollInCourseTrans();
						t1.execute(callNum, user);
						break;
					case 2:
						ListCoursesTrans t2 = new ListCoursesTrans();
						t2.execute(user);
						inter.showCourseList(t2.listOfCourses);
						break;
					case 3:
						int pac = inter.getNewPAC();
						ChangePACTrans t3 = new ChangePACTrans();
						t3.execute(pac, user);
						break;
					case 4:
						callNum = inter.getCallNum();
						DropCourseTrans t4 = new DropCourseTrans();
						t4.execute(callNum, user);
						break;
					case 5:
						ListGradesTrans t5 = new ListGradesTrans();
						t5.execute(user);
						inter.showGradeList(t5.gradeList);
						break;
					case 6:
						int deptNum = inter.getDeptNumber();
						int courseNum = inter.getCourseNumber();
						ListOpenSectionsTrans t6 = new ListOpenSectionsTrans();
						t6.execute(deptNum, courseNum);
						inter.showOpenSectionsList(t6.openSectionsList);						
						break;
					case 7:
						ShowFeesTrans t7 = new ShowFeesTrans();
						t7.execute(user);
						double totalFees = t7.totalFees;
						double totalPaid = t7.totalPaid;
						inter.showFees(totalFees, totalPaid);
						break;
					default:
						if (transId != 99)
							inter.showInvalidChoice();
				}
			} while (transId != 99);
		}
	}

} /* end of StudentController */