/*

  * Licensed to the Apache Software Foundation (ASF) under one

  * or more contributor license agreements.  See the NOTICE file

  * distributed with this work for additional information

  * regarding copyright ownership.  The ASF licenses this file

  * to you under the Apache License, Version 2.0 (the

  * "License"); you may not use this file except in compliance

  * with the License.  You may obtain a copy of the License at

  *

  *   http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing,

  * software distributed under the License is distributed on an

  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

  * KIND, either express or implied.  See the License for the

  * specific language governing permissions and limitations

  * under the License.

  */

 package org.apache.myfaces.shared.util;

 import java.util.Iterator;

 import java.util.NoSuchElementException;

 /**

  * Iterator without elements

  */

 public final class NullIterator<T> implements Iterator<T>

 {

     //~ Static fields/initializers -----------------------------------------------------------------

     private static final NullIterator<?> INSTANCE = new NullIterator<Object>();

     //~ Methods ------------------------------------------------------------------------------------

     @SuppressWarnings("unchecked")

     public static final <T> Iterator<T> instance()

     {

         return (Iterator<T>) INSTANCE;

     }

     public boolean hasNext()

     {

         return false;

     }

     public T next()

     {

         throw new NoSuchElementException();

     }

     public void remove()

     {

         throw new UnsupportedOperationException(this.getClass().getName() + " UnsupportedOperationException");

     }

 }