Collections/CountableEnumerator.cs

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/*
 * Author: Kishore Reddy
 * Url: http://commonlibrarynet.codeplex.com/
 * Title: CommonLibrary.NET
 * Copyright: � 2009 Kishore Reddy
 * License: LGPL License
 * LicenseUrl: http://commonlibrarynet.codeplex.com/license
 * Description: A C# based .NET 3.5 Open-Source collection of reusable components.
 * Usage: 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;
using System.Text;

namespace GenericCode.Collections
{
    /// <summary>
    /// Extension to enumerator with extended methods to indicate if last or first item
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public interface ICountableEnumerator<T> : IEnumerator<T>
    {
        /// <summary>
        /// Indicates if the enumerator is empty ( it has 0 items ).
        /// </summary>
        bool IsEmpty { get; }


        /// <summary>
        /// Indicate if current item is first.
        /// </summary>
        /// <returns></returns>
        bool IsFirst();


        /// <summary>
        /// Indicate if current item is last.
        /// </summary>
        /// <returns></returns>
        bool IsLast();


        /// <summary>
        /// Get the index of the current item.
        /// </summary>
        /// <returns></returns>
        int CurrentIndex { get; }


        /// <summary>
        /// Get the total number of items.
        /// </summary>
        int Count { get; }
    }