/*******************************************************/
/*****  Author: David McCabe  ***  S-ID: 12129103  *****/
/*******************************************************/
 
import java.io.*;
import ContactDetails.*;
 
public class TestStudentContactDetails {
 
    //Creates a new instance of TestStudentContactDetails
    public TestStudentContactDetails() {
    }
 
    public static void main (String [] args) {
 
        // create instance
        StudentContactDetails details = new StudentContactDetails();  // fill in the arguments
 
		// call member
        try
        {
            details.emailAddress("12129103", "E410UJ");
        }
		catch (ContactDetails.StudentContactDetails.IdNotFoundException e)
        {
            System.out.println("Registration Number not found");
        }
		catch (ContactDetails.StudentContactDetails.EmailAddressNotAvailableException e)
        {
            System.out.println("Email Address not found");
        }
		/*
		catch (java.io.FileNotFoundException e)
        {
            System.out.println("java.io.FileNotFoundException thrown");
        }
		catch (java.io.IOException e)
        {
            System.out.println("java.io.IOException thrown");
        }
		*/
 
    }// main
 
}// TestStudentContactDetails

package ContactDetails;
 
import java.io.*;
 
public class StudentContactDetails
{
    /* member class not found */
    class EmailAddressNotAvailableException {}
 
    /* member class not found */
    class IdNotFoundException {}
 
 
    public StudentContactDetails()
    {
    }
 
    public String emailAddress(String RegNumber, String Course)
        throws IdNotFoundException, EmailAddressNotAvailableException, FileNotFoundException, IOException
    {
        File inputFile = new File("c:/UserInfo/" + Course + ".csv");
        char Separator = ',';
        BufferedReader InputAddresses = new BufferedReader(new FileReader(inputFile));
        String EmailAddressString = "***ERROR: Email Address not found for " + RegNumber;
        String s;
        boolean RegNumberFound;
        for(RegNumberFound = false; (!RegNumberFound) & ((s = InputAddresses.readLine()) != null);)
        {
            int FirstSeparatorPos = s.indexOf(',', 0);
            int SecondSeparatorPos = s.indexOf(',', FirstSeparatorPos + 1);
            String NextRegNumber = s.substring(FirstSeparatorPos + 1, SecondSeparatorPos);
            RegNumberFound = true;
            int NextSeparatorPos = SecondSeparatorPos;
            for(int PosCounter = 3; PosCounter < 9; PosCounter++)
                NextSeparatorPos = s.indexOf(',', NextSeparatorPos + 1);
 
            int EndSeparatorPos = s.indexOf(',', NextSeparatorPos + 1);
            EmailAddressString = s.substring(NextSeparatorPos + 1, EndSeparatorPos);
        }
 
        if(RegNumberFound)
        {
            if(!EmailAddressString.equals(""))
                return EmailAddressString;
            else
                throw new EmailAddressNotAvailableException();
        } else
        {
            throw new IdNotFoundException();
        }
    }
}