// *******************************************
import EDU.neu.ccs.demeter.*;
 class Block_List implements java.util.Enumeration, Cloneable {
  protected Nonempty_Block_List first;
  public Nonempty_Block_List get_first() { return first;   }
  public void set_first(Nonempty_Block_List new_first) { first = new_first;   }
  public Block_List() { super();   }
  public Block_List(Nonempty_Block_List first) {
    super();
    set_first(first);
    }

  
  private Nonempty_Block_List tail;
  public void addElement(Block e) { 
    checktail(); 
    if (tail == null) {
      first = new Nonempty_Block_List(e,null); tail = first;
    } else {
	tail.set_next(new Nonempty_Block_List(e,null)); tail = tail.get_next();
    }
  }

  public void push(Block e) { first = new Nonempty_Block_List(e,first); }

  public java.util.Enumeration elements() { return new Block_List(first); } 

  public int size() {
    int i= 0;
    for (java.util.Enumeration e=elements(); e.hasMoreElements(); i++)
	e.nextElement();
    return i;
  }
  public boolean isEmpty() { return (first == null); }

  public boolean hasMoreElements() { return (first != null); }

  public Object nextElement() {
    Block car = first.get_it();
    first = first.get_next();
    return (Object) car;
  }

  private void checktail() {
    if (tail == null && first != null) {
	tail = first;
	while (tail.get_next() != null) tail = tail.get_next();
    }
  }
  public boolean contains(Block e) {
    java.util.Enumeration en = this.elements();
    while (en.hasMoreElements())
	if (e.equals((Block) en.nextElement())) return true;
    return false;
  }

}