Optimized Indexed Matching

using System;
using System.Collections.Generic;
using System.Linq;

namespace Matching.Expressions
{
    /// <summary>
    /// A matching expression that performs an And operation.
    /// </summary>
    public class AndMatchingExpression : IEnumerable<int>
    {
        private const int StopValue = Int32.MinValue;

        private List<IEnumerable<int>> enumerables = new List<IEnumerable<int>>();

        public AndMatchingExpression()
        { }

        public AndMatchingExpression(params IEnumerable<int>[] indexes)
        {
            foreach (var index in indexes)
                this.Add(index);
        }

        public AndMatchingExpression(IEnumerable<IEnumerable<int>> indexes)
        {
            foreach (var index in indexes)
                this.Add(index);
        }

        /// <summary>
        /// Adds the index to this matching session.
        /// </summary>
        public void Add(IEnumerable<int> index)
        {
            this.enumerables.Add(index);
        }

        public IEnumerator<int> GetEnumerator()
        {
            // Get enumerators:
            var enumerators = this.enumerables.Select(e => e.GetEnumerator()).ToArray();
            var enumeratorCount = enumerators.Length;
            int cursor = 0;

            try
            {
                int prevValue = StopValue;
                int prevValueCursor = StopValue;

                // Search values common to all enumerators:
                while (true)
                {
                    var v = GetNextOfEnumerator(enumerators[cursor], prevValue);

                    if (v > prevValue)
                    {
                        prevValue = v;
                        prevValueCursor = cursor;
                        cursor = ((cursor + 1) % enumeratorCount);
                    }
                    else if (v == StopValue)
                    {
                        break;
                    }
                    else
                    {
                        cursor = ((cursor + 1) % enumeratorCount);
                        if (cursor == prevValueCursor)
                        {
                            yield return prevValue;
                        }
                    }
                }
            }
            finally
            {
                // Dispose all enumerators:
                foreach (var enumerator in enumerators)
                    enumerator.Dispose();
            }
        }

        System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
        {
            return (System.Collections.IEnumerator)this.GetEnumerator();
        }

        private static int GetNextOfEnumerator(IEnumerator<int> enumerator, int atLeast)
        {
            do
            {
                if (!enumerator.MoveNext())
                {
                    return StopValue;
                }
            } while (enumerator.Current < atLeast);
            return enumerator.Current;
        }
    }
}