//
// System.CharEnumerator.cs
//
// Author: Duncan Mak  (duncan@ximian.com)
//
// (C) Ximian, Inc.
//

using System.Collections;

namespace System
{
	[Serializable]
	public sealed class CharEnumerator : IEnumerator, ICloneable
	{
		private string str;
		private int idx;
		private int len;
		
		// Constructor
		internal CharEnumerator (string s)
		{
			 str = s;
			 idx = -1;
			 len = s.Length;
		}
		
		// Property
		public char Current
		{
			get { if (idx == -1)
				throw new InvalidOperationException ("The position is not valid.");

			return str [idx];
			}
		}
		
		object IEnumerator.Current
		{
			get { if (idx == -1)
				throw new InvalidOperationException ("The position is not valid");

			return str [idx];
			}
		}
		
		// Methods
		public object Clone ()
		{
			CharEnumerator x = new CharEnumerator (str);
			x.idx = idx;
			return x;
		}
		
		public bool MoveNext ()
		{
			if (len < 0)
				return false;
			
			idx++;
			
			if (idx >= len) {
				idx = -1;
				return false;
			}
			
			return true;
		}
		
		public void Reset ()
		{
			idx = -1;

		}
	}
}