// $Id$
// 
// Copyright 2007-2008 Cisco Systems Inc.
// 
// Licensed 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.

using System;
using System.Collections.Generic;

namespace Etch.Util
{
    public class EmptyIterator<E> : IEnumerator<E>
    {

        #region IEnumerator<E> Members

        public E Current
        {
            get { throw new Exception( "No such element" ); }
        }

        #endregion

        #region IDisposable Members

        public void Dispose()
        {
            throw new Exception( "Invalid operation" );
        }

        #endregion

        #region IEnumerator Members

        object System.Collections.IEnumerator.Current
        {
            get { throw new Exception( "No such element" ); }
        }

        public bool MoveNext()
        {
            return false;
        }

        public void Reset()
        {
            throw new Exception( "Invalid operation" );
        }

        #endregion
    }
}