// Read a list of people from a file, output the list, and then examine it.
// Barry Cornelius, 19 June 2000
import java.util. ArrayList;
import java.io.   BufferedReader;
import java.io.   FileReader;
import java.io.   InputStreamReader;
import java.io.   IOException;
import java.util. Iterator;
import java.util. List;
public class ExamineList
{
   public static void main(final String[] pArgs) throws IOException
   {
      if (pArgs.length!=1)
      {
         System.out.println("Usage: java ExamineList datafile");
         System.exit(1);
      } //BJCHEREFIRST
      final List<Person> tList = new ArrayList<Person>();
      // read a list of people from a file
      final BufferedReader tInputHandle =
                    new BufferedReader(new FileReader(pArgs[0]));
      while (true)
      {
         final String tFileLine = tInputHandle.readLine();
         if (tFileLine==null)
         {
            break;
         }
         final Person tFilePerson = new PersonImpl(tFileLine);
         tList.add(tFilePerson);
      }
      // tList.add(new java.util.Date());
      // output the list that has been read in
      final Iterator<Person> tIterator = tList.iterator();
      while (tIterator.hasNext())
      {
         final Person tIteratePerson = tIterator.next();
         System.out.println(tIteratePerson);
      }
      // ask the user to examine the list
      final BufferedReader tKeyboard =
                    new BufferedReader(new InputStreamReader(System.in));
      while (true)
      {
         System.out.print("Person? ");  
         System.out.flush();
         final String tKeyboardLine = tKeyboard.readLine();
         if (tKeyboardLine.equals(""))
         {
            break;
         }
         final Person tTargetPerson = new PersonImpl(tKeyboardLine);
         final int tPosition = tList.indexOf(tTargetPerson);
         System.out.print(tTargetPerson);
         if (tPosition>=0)
         {
            System.out.println(" is at position " + tPosition);
         }
         else
         {
            System.out.println(" is absent");
         }
      } 
   }
}