EmptyIterator.java |
package de.spieleck.util; import java.util.Iterator; import java.util.NoSuchElementException; /** * Convenicence class to provide an empty implementation of the * Iterator Interface. This is a Singleton. * */ public class EmptyIterator implements Iterator { /** This is a Singleton. */ protected static Iterator mySelf = new EmptyIterator(); /** This is a Singleton. */ private EmptyIterator() { } public static Iterator getInstance() { return mySelf; } public boolean hasNext() { return false; } public Object next() { // It's a hard world, just cry out loud throw new NoSuchElementException(); } public void remove() { throw new UnsupportedOperationException("Cannot remove from EmptyIterator"); } } // // Jacson - Text Filtering with Java. // Copyright (C) 2002 Frank S. Nestel (nestefan -at- users.sourceforge.net) // // This library is free software; you can redistribute it and/or // modify it under the terms of the GNU Lesser General Public // License as published by the Free Software Foundation; either // version 2.1 of the License, or (at your option) any later version. // // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU // Lesser General Public License for more details. // // You should have received a copy of the GNU Lesser General Public // License along with this library; if not, write to the Free Software // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA //
EmptyIterator.java |