/*  Directoryfile.cpp
 *
 * This is the cpp file for the  Directoryfile.
 *
 */

#include "Directoryfile.h"  // the header for the class
#include <fstream>
#include <iostream>
#include <string>
#include <iomanip>     // for setw, setiosflags, etc...
using namespace std;

// First constructor
// This sets up the elements 
Directoryfile::Directoryfile()
{
  // Initialize 
  key = 0;
  key_length=4;
 
  
  recsize = key_length + 2;

}

// The destructor for the Bucketfile class.
// We didn't allocate any memory using the "new" keyword, so we
// don't have anything to do here.
Directoryfile::~Directoryfile()
{
}

// Accessors for
int Directoryfile::getKey() const
{
  return key;
}

void Directoryfile::setKey(int newKey)
{
  key = newKey;
}



 

// seek to the appropriate record for reading
void Directoryfile::InputPositioningByRRN(int RRN, istream& input)
{
  input.seekg(RRN * recsize, ios::beg);
}

// seek to the appropriate position for writing
void Directoryfile::OutputPositioningByRRN(int RRN, ostream& output)
{
  output.seekp(RRN * recsize, ios::beg);
}




 //read a student from a istream 
void Directoryfile::readDirectoryfile(int rrn, istream& input)
{
  //Directoryfile& buck;
 
  string key_str;
  


  string directory_line;

  // seek to the appropriate student
  InputPositioningByRRN(rrn, input);

  // read in a line from fine
  getline(input,directory_line,'\n');

  // get the number and last name and first name and credits and CGPA strings
  key_str = directory_line.substr(0,key_length);
 
  
  
  // convert the numKeys and depthBucket string into int.
  key = atoi((key_str.c_str()));
  


 
  // set number and lastname and firstname and credits and CGPA for student s
  setKey(key);

}