import java.util.Stack;
import Card;

/* Note: Inherits operations from stack class.  Overrides the push 
         operation to provide a stack that will only accept cards in 
	 order. */

public class BuildStack extends Stack
{
   public boolean push (Card item)
   /* Function: Compares arguement card to the top card of the stack.  If the
                card is one greater than the top card, then it is pushed 
       	        onto the stack.  Otherwise the card is not pushed onto the
                stack.
       Accepts: A card.
       Returns: A boolean value representing the success or failure of the 
   	     push operation. */
   {
      Card temp = new Card ();
      Object object = new Object ();

      if (empty ()) {
         temp.setUseValue (0);	//if stack is empty then look for an ace
         }
      else {
         object = this.peek ();
         temp = (Card) object;  //cast object into a card
         }
      if (item.showUseValue() == 14) {
         if (temp.showUseValue() == 13)
            return false;
         else 
            item.setUseValue(temp.showUseValue() + 1);
         }
      if (temp.showUseValue () + 1 == item.showUseValue ()) {
         super.push (item);	//Call to superclass Push operation
         return true;
         }
      return false;
   }
}