package plp.collection;

import java.util.Iterator;
import java.util.NoSuchElementException;

public class CListIterator implements Iterator {
    
    private final CList clist;
    private Cell current;

    public CListIterator(CList clist) {
	this.clist = clist;
	current = clist.first().next();
    }
    
    public boolean hasNext() {
	return current != clist.end();
    }
	    
    public Object next() {
	if (! hasNext()) {
	    throw new NoSuchElementException();
	}
	Object o = current.data();
	current = current.next();
	return o;
    }

    /** remove() is not possible during iteration in a CList. */
    public void remove() {
	throw new UnsupportedOperationException();
    }
}