/*
  Processing of a List of integer objects, using class List
  This shows that we can implement the functionality in our
  first example, but using only a list of objects.
  We need to define predicates and comparators to do this
  */

import java.lancs.*;

public class Test
{      
         
 public static void main(String[] args) throws Exception
  {
    List l1 = new List();
    String prompt =   "Type in command: ";
    String commands = "(end, show, cons, length, add, " +
                      "insert, reverse, present, help) ";

    BasicIo.prompt(prompt + commands);
    String command = BasicIo.readString();
    
    while (!command.equals("end"))
      {
	if (command.equals("help"))
	    System.out.println(commands);

	if (command.equals("show"))
	  System.out.println(l1);

	if (command.equals("cons"))
	  System.out.println(l1.cons());

	if (command.equals("length"))
	  System.out.println(l1.length());

	if (command.equals("add")){
	  BasicIo.prompt("data: ");
	  int i = BasicIo.readInteger();
	  l1 = l1.add(new Integer(i));
	  System.out.println(l1);}

	if (command.equals("insert")){
	  BasicIo.prompt("data: ");
	  int i = BasicIo.readInteger();
	  l1 = l1.insert(new Integer(i),new IntComp());
	  System.out.println(l1);
	}

	if (command.equals("present")) {
	  BasicIo.prompt("data: ");
	  int i = BasicIo.readInteger();
	  IntPred pred = new IntPred(i);
	  System.out.println(l1.isPresent(pred));
	}

	if (command.equals("reverse")){
	  try {
	    l1 = l1.reverse();
	    System.out.println(l1);
	  } catch (ListException e){System.out.println("Woops");}
	}

	BasicIo.prompt(prompt);
	command = BasicIo.readString();
      }
  }
}