import objectdraw.*;

/*
 * A non-empty image stack.  This stack contains a single image,
 * and the rest of the stack after the first image.
 */
public class NonEmptyStack implements StackInterface {

  private VisibleImage log;
  private StackInterface rest;

  // Create a stack out a single image and the rest of the stack
  public NonEmptyStack(VisibleImage theLog, StackInterface theRest) {
    log = theLog;
    rest = theRest;
  }

  public boolean isEmpty() { 
    return false; 
  }

  // Return the first element.
  public VisibleImage getFirst() { 
    return log; 
  }

  // Return the StackInterface object that represents the rest 
  // of the stack.
  public StackInterface getRest() { 
    return rest; 
  }

}