instructorcontroller.java

国外的数据结构与算法分析用书

package Controllers;

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

/**	This class executes instructor transactions based
	upon the user's selection from the interface. */
public class InstructorController implements UserController
{
	
	protected InstructorInterface inter;

	/**	For the instructor accessing the system, read in a
		transaction and execute it */
	public void initiate(Person newUser)
	{
		inter = new InstructorInterface();

		int transId = 0;
		Instructor user = (Instructor)newUser; 
		CallNum callNum = null;		
		if (user != null)
		{
			do
			{
				transId = inter.getCommandID();
				
				switch (transId)
				{
					case 20:
						int studentNum = inter.getStudentNumber();
						StudentGradeTrans t20 = new StudentGradeTrans();
						t20.execute(studentNum);
						inter.showGradeList(t20.gradeList);
						break;
					case 21:
						callNum = inter.getCallNum();
						ClassListTrans t21 = new ClassListTrans();
						t21.execute(callNum);
						inter.showClassList(t21.classList);
						break;
					case 22:
						callNum = inter.getCallNum();
						SectEnrollmentTrans t22 = new SectEnrollmentTrans();
						t22.execute(callNum);
						inter.showEnrollmentLimit(t22.limit); 
						break;
					default:
						if (transId != 99)
							inter.showInvalidChoice();
				}
			} while (transId != 99);
		}
	}

} /* end of InstructorController */