OrderablePartitioner.cs

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// 
// OrderablePartitioner.cs
//  
// Author:
//       Jérémie "Garuma" Laval <jeremie.laval@gmail.com>
// 
// Copyright (c) 2009 Jérémie "Garuma" Laval
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

#if NET_4_0

using System;
using System.Collections.Generic;

namespace System.Collections.Concurrent
{
    public abstract class OrderablePartitioner<TSource> : Partitioner<TSource>
    {
        bool keysOrderedInEachPartition;
        bool keysOrderedAcrossPartitions;
        bool keysNormalized;
        
        protected OrderablePartitioner (bool keysOrderedInEachPartition,
                                        bool keysOrderedAcrossPartitions, 
                                        bool keysNormalized) : base ()
        {
            this.keysOrderedInEachPartition = keysOrderedInEachPartition;
            this.keysOrderedAcrossPartitions = keysOrderedAcrossPartitions;
            this.keysNormalized = keysNormalized;
        }
        
        public override IEnumerable<TSource> GetDynamicPartitions ()
        {
          foreach (KeyValuePair<long, TSource> item in GetOrderableDynamicPartitions ())
            yield return item.Value;
        }
        
        public override IList<IEnumerator<TSource>> GetPartitions (int partitionCount)
        {
            IEnumerator<TSource>[] temp = new IEnumerator<TSource>[partitionCount];
            IList<IEnumerator<KeyValuePair<long, TSource>>> enumerators
              = GetOrderablePartitions (partitionCount);
            
            for (int i = 0; i < enumerators.Count; i++)
                temp[i] = new ProxyEnumerator (enumerators[i]);
            
            return temp;
        }

        
        IEnumerator<TSource> GetProxyEnumerator (IEnumerator<KeyValuePair<long, TSource>> enumerator)
        {
            while (enumerator.MoveNext ())
                yield return enumerator.Current.Value;
        }
        
        public abstract IList<IEnumerator<KeyValuePair<long, TSource>>> GetOrderablePartitions(int partitionCount);
        
        public virtual IEnumerable<KeyValuePair<long, TSource>> GetOrderableDynamicPartitions()
        {
            if (!SupportsDynamicPartitions)
                throw new NotSupportedException ();
            
            return null;
        }

        public bool KeysOrderedInEachPartition {
            get {
                return keysOrderedInEachPartition;
            }
        }
        
        public bool KeysOrderedAcrossPartitions {
            get {
                return keysOrderedAcrossPartitions;
            }
        }
        
        public bool KeysNormalized {
            get {
                return keysNormalized;
            }
        }

        class ProxyEnumerator : IEnumerator<TSource>, IDisposable
        {
            IEnumerator<KeyValuePair<long, TSource>> internalEnumerator;

            internal ProxyEnumerator (IEnumerator<KeyValuePair<long, TSource>> enumerator)
            {
                internalEnumerator = enumerator;
            }

            public void Dispose ()
            {
                internalEnumerator.Dispose ();
            }

            public bool MoveNext ()
            {
                if (!internalEnumerator.MoveNext ())
                    return false;

                Current = internalEnumerator.Current.Value;

                return true;
            }

            public void Reset ()
            {
                internalEnumerator.Reset ();
            }

            object IEnumerator.Current {
                get {
                    return Current;
                }
            }

            public TSource Current {
                get;
                private set;
            }
        }
    }
}
#endif