import java.util.Iterator;
import java.util.Scanner;
/**
   A class of telephone directories.
   @author Frank M. Carrano
   @author Timothy M. Henry
   @version 4.0
*/
public class TelephoneDirectory
{
   private DictionaryInterface<Name, String> phoneBook; // Sorted dictionary with distinct search keys

   public TelephoneDirectory() 
   { 
      phoneBook = new SortedDictionary<>();
   } // end default constructor
   
   // 19.10
   /** Reads a text file of names and telephone numbers.
       @param data  A text scanner for the text file of data. */
   public void readFile(Scanner data)
   {
      while (data.hasNext())
      {
         String firstName   = data.next();
         String lastName    = data.next();
         String phoneNumber = data.next();

         Name fullName = new Name(firstName, lastName);
         phoneBook.add(fullName, phoneNumber);
      } // end while

      data.close();  
   } // end readFile
   
   // 19.11
   /** Gets the phone number of a given person. */
   public String getPhoneNumber(Name personName)
   {
      return phoneBook.getValue(personName);
   } // end getPhoneNumber

   public String getPhoneNumber(String firstName, String lastName)
   {
      Name fullName = new Name(firstName, lastName);
      return phoneBook.getValue(fullName);
   } // end getPhoneNumber

} // end TelephoneDirectory