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Class distans.AnswerData 

java.lang.Object
   |
   +----java.util.Dictionary
           |
           +----java.util.Hashtable
                   |
                   +----distans.AnswerData
public class AnswerData
extends Hashtable
This class is responsible for storing the students answers. The class extends hashtable, the hashtable uses a PageData object as key. The key is associated to a String array that holds the answers and the grade. The String array thus has an structure like this answerI,gradeI,answerII,gradeII and so on.
For QuestionPages of type cross and alt the answers strings are integers, for written though a text string is used. The AnswerData also hold two Class variable (static) vectors with the cedulas and the name of the students as well as a hashtable for mapping between name and cedula.

Variable Index

o ALT
o cedulaNo
The CedulaNo of the student
o CROSS
o nameToCedulaHT
Hashtable with key == name value == cedula
o NO_OF_DATA
o studentCedulas
Static vector with all the cedulas
o studentName
The name of the student (both first and last name)
o studentNames
Static vector with all the student names
o UNDEFINED_TYPE
o WRITTEN

Constructor Index

o AnswerData(String)
o AnswerData(String, String, String)
Created a new AnswerData for a student, the first and last name are put in one string with space separating them.

Method Index

o addStudentCedula(String)
A very primitive sort function, but it's only done once so no big deal.
o addStudentName(String)
A very primitive sort function, but it's only done once so no big deal.
o getGrade(PageData, int)
o getNoOfCorrects(PageData)
o getStudentAnswerNumerical(PageData, int)
o getStudentAnswerText(PageData, int)
o getStudentCedulas()
Static method returning all the student cedulas
o getStudentName()
o getStudentNames()
Static method returning all the student names
o hasAnswered(PageData)
o hashCode()
The hashcode is taken from the cedula number.
o nameToCedula(String)
o parseCedula(String)
Static method that parse a String into an int, if the String can't be parsed 0 is returned.
o putStudentAnswers(PageData, String[])
puts a String array with the answers that the student has given for the PageData object into the hashtable
o setGrade(PageData, int, int)
Sets the grade
o setStudentName(String)
Sets the name of the student
o toString()
This method writes the AnswerData on a String, used for debugging

Variables

o ALT 
 static final int ALT
o CROSS 
 static final int CROSS
o WRITTEN 
 static final int WRITTEN
o UNDEFINED_TYPE 
 static final int UNDEFINED_TYPE
o NO_OF_DATA 
 static final int NO_OF_DATA
o cedulaNo 
 private String cedulaNo
The CedulaNo of the student

o studentCedulas 
 static Vector studentCedulas
Static vector with all the cedulas

o studentNames 
 static Vector studentNames
Static vector with all the student names

o nameToCedulaHT 
 static Hashtable nameToCedulaHT
Hashtable with key == name value == cedula

o studentName 
 private String studentName
The name of the student (both first and last name)

Constructors

o AnswerData 
 public AnswerData(String cedulaNo,
                   String studentFirstName,
                   String studentLastName)
Created a new AnswerData for a student, the first and last name are put in one string with space separating them.

Parameters:
cedulaNo - the cedula number
studentFirstName - the First name of the student
studentLastName - the students family name.
o AnswerData 
 public AnswerData(String cedula)

Methods

o hashCode 
 public int hashCode()
The hashcode is taken from the cedula number.

Overrides:
hashCode in class Object
o nameToCedula 
 public static String nameToCedula(String name)
Parameters:
name - a student name
Returns:
the cedula number for a student name
o toString 
 public String toString()
This method writes the AnswerData on a String, used for debugging

Overrides:
toString in class Hashtable
o getStudentAnswerNumerical 
 public int getStudentAnswerNumerical(PageData pd,
                                      int question)
Parameters:
pd - a PageData object for a QuestionPage
question - the number of the subquestion on the QuestionPage
Returns:
the numerical answer given by the student for PageData pd and subquestion question. This method don't have a lot of meaning for QuestionPAges of type written.
o getStudentAnswerText 
 public String getStudentAnswerText(PageData pd,
                                    int question)
Returns:
the String answer for subquestion question and the given PageData object This is not nessecarally the correct answer.
o getGrade 
 public int getGrade(PageData pd,
                     int question)
Returns:
the grade for the given subquestion and PageData. This is however not used in the current version has there is no way to save the grades on the server.
o setGrade 
 public void setGrade(PageData pd,
                      int question,
                      int grade)
Sets the grade

Parameters:
pd - the PageData containing the questions
question - the subquestion
grade - the new grade
See Also:
getGrade
o hasAnswered 
 public boolean hasAnswered(PageData pd)
Returns:
true if a student has responded to the QuestionPage given by the PageData object
o getNoOfCorrects 
 public int getNoOfCorrects(PageData pd)
Returns:
the number of correctly answered subquestions for the QuestionPage given by the PageData object.
o putStudentAnswers 
 public void putStudentAnswers(PageData pd,
                               String answers[])
puts a String array with the answers that the student has given for the PageData object into the hashtable

o getStudentName 
 public String getStudentName()
Returns:
the name of the student
o setStudentName 
 public void setStudentName(String name)
Sets the name of the student

Parameters:
name - the students name
o parseCedula 
 static int parseCedula(String cedula)
Static method that parse a String into an int, if the String can't be parsed 0 is returned.

Parameters:
cedula - the String to parse
Returns:
the int parsed
o getStudentNames 
 public static Enumeration getStudentNames()
Static method returning all the student names

o getStudentCedulas 
 public static Enumeration getStudentCedulas()
Static method returning all the student cedulas

o addStudentCedula 
 private static void addStudentCedula(String cedula)
A very primitive sort function, but it's only done once so no big deal. It sorts the studentCedulas vector nummerically

o addStudentName 
 private static void addStudentName(String name)
A very primitive sort function, but it's only done once so no big deal. It sorts the studentNames Vector alphabetically. 

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