// $Id$
// 
// 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.
// 
using System;
using System.Collections.Generic;

namespace Org.Apache.Etch.Bindings.Csharp.Util
{
    /// <summary>
    /// An iterator over a single object
    /// </summary>
    public class SingleIterator<E> : IEnumerator<E>
    {
        private E _obj;

        public SingleIterator( Object obj )
        {
            _obj = ( E ) obj;
        }

        #region IEnumerator<E> Members

        public E Current
        {
            get 
            {
                if ( _obj == null )
                    throw new Exception( "No Such element" );

                E o = _obj;
                _obj = default(E);
                return o;
            }
        }

        #endregion

        #region IDisposable Members

        public void Dispose()
        {
            throw new Exception( "The method or operation is not implemented." );
        }

        #endregion

        #region IEnumerator Members

        object System.Collections.IEnumerator.Current
        {
            get
            {
                if ( _obj == null )
                    throw new Exception( "No Such element" );

                E o = _obj;
                _obj = default( E );
                return o;
            }
        }

        public bool MoveNext()
        {
            return _obj != null;
        }

        public void Reset()
        {
            throw new Exception( "The method or operation is not implemented." );
        }

        #endregion
    }
}