package University;
import java.util.*;
import javax.ejb.*;
public class CourseBean implements SessionBean 
{
String studentName;
String studentRollNo;
Vector selectedCourse;
public void ejbCreate(String StudentName, String RollNo) throws CreateException 
{
if (StudentName == null) 
{
throw new CreateException("Null person not allowed.");
}
else 
{
studentName= StudentName;
}
selectedCourse = new Vector();
}
public String addCourse(String Cname) 
{	  
if (Cname==null)
{
return "";		  
}
try
{
if(!selectedCourse.isEmpty())
{	
Enumeration enumer = selectedCourse.elements();           
String title="";    
while(enumer.hasMoreElements()) 
{            	    
title = (String)enumer.nextElement();
if(title!=null)                
{
if(Cname.equals(title))
{
return "You have already selected this course";
}	                
}
}               
selectedCourse.addElement(Cname);
			}
else
{
selectedCourse.addElement(Cname);
}
}	
catch(Exception e)
{
return "Error";	
}
return "";
}
public String removeCourse(String Cname) 
{
boolean result = selectedCourse.removeElement(Cname);
if (result == false)
{
return Cname + "course is not in cart.";
}
return "Course Removed";
}
public Vector getSelectedCourse() 
{
return selectedCourse;
}
public CourseBean() {}
public void ejbRemove() {}
public void ejbActivate() {}
public void ejbPassivate() {}
public void setSessionContext(SessionContext sc) {}
}