// A program that tests the Pop interface and the PopImpl class.
// Barry Cornelius, 19 June 2000
import java.io. BufferedReader;
import java.io. InputStreamReader;
import java.io. IOException;
public class PopImplProg
{
   private static Pop iPop;
   private static BufferedReader iKeyboard;
   public static void main(final String[] pArgs) throws IOException
   {
      iPop = new PopImpl();
      iKeyboard = new BufferedReader(new InputStreamReader(System.in));
      while (true)
      {
         System.out.print("Command? ");
         System.out.flush();
         final char tCommand = iKeyboard.readLine().toLowerCase().charAt(0);
         if (tCommand=='q')
         {
            break;
         }
         iProcessCommand(tCommand);
         System.out.println();
      }
   }
   private static void iProcessCommand(final char pCommand)
                                                          throws IOException
   {
      switch (pCommand)
      {
         case 'a':
         {
            System.out.print("Person? ");
            System.out.flush();
            final Person tPerson = new PersonImpl(iKeyboard.readLine());
            if ( ! iPop.add(tPerson) )
            {
               System.out.println("The person is already in the population");
            }
         }
         break; //BJCHEREFIRST
         case 'd':
         {
            iPop = new PopImpl();
         }
         break;
         case 'g':
         {
            System.out.print("Name? ");
            System.out.flush();
            final String tName = iKeyboard.readLine();
            final Person tPerson = iPop.get(tName);
            if (tPerson==null)
            {
               System.out.println("No such person in the population");
            }
            else 
            {
               System.out.println(tPerson);
            }
         }
         break;
         case 'r':
         {
            System.out.print("Name? ");
            System.out.flush();
            final String tName = iKeyboard.readLine();
            if ( ! iPop.remove(tName) )
            {
               System.out.println("The person is not in the population");
            }
         }
         break;
         default:
         {
            System.out.println(pCommand + " is not a valid command letter");
         }
         break;
      }
   }
}