mcs/class/System.Core/System.Linq.Parallel.QueryNodes/QuerySelectManyNode.cs

   1 //
   2 // QueryConcatNode.cs
   3 //
   4 // Author:
   5 //       Jérémie "Garuma" Laval <jeremie.laval@gmail.com>
   6 //
   7 // Copyright (c) 2010 Jérémie "Garuma" Laval
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining a copy
  10 // of this software and associated documentation files (the "Software"), to deal
  11 // in the Software without restriction, including without limitation the rights
  12 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  13 // copies of the Software, and to permit persons to whom the Software is
  14 // furnished to do so, subject to the following conditions:
  15 //
  16 // The above copyright notice and this permission notice shall be included in
  17 // all copies or substantial portions of the Software.
  18 //
  19 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  22 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  23 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  24 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  25 // THE SOFTWARE.
  26
  27 #if NET_4_0
  28 using System;
  29 using System.Threading;
  30 using System.Collections;
  31 using System.Collections.Generic;
  32
  33 namespace System.Linq.Parallel.QueryNodes
  34 {
  35         internal class QuerySelectManyNode<TSource, TCollection, TResult> : QueryStreamNode<TResult, TSource>
  36         {
  37                 Func<TSource, IEnumerable<TCollection>> collectionSelector;
  38                 Func<TSource, int, IEnumerable<TCollection>> collectionSelectorIndexed;
  39                 Func<TSource, TCollection, TResult> resultSelector;
  40
  41                 internal QuerySelectManyNode (QueryBaseNode<TSource> parent,
  42                                               Func<TSource, int, IEnumerable<TCollection>> collectionSelectorIndexed,
  43                                               Func<TSource, TCollection, TResult> resultSelector)
  44                         : base (parent, true)
  45                 {
  46                         this.collectionSelectorIndexed = collectionSelectorIndexed;
  47                         this.resultSelector = resultSelector;
  48                 }
  49
  50                 internal QuerySelectManyNode (QueryBaseNode<TSource> parent,
  51                                               Func<TSource, IEnumerable<TCollection>> collectionSelector,
  52                                               Func<TSource, TCollection, TResult> resultSelector)
  53                         : base (parent, false)
  54                 {
  55                         this.collectionSelector = collectionSelector;
  56                         this.resultSelector = resultSelector;
  57                 }
  58
  59                 internal override IEnumerable<TResult> GetSequential ()
  60                 {
  61                         IEnumerable<TSource> source = Parent.GetSequential ();
  62
  63                         return IsIndexed ?
  64                                 source.SelectMany (collectionSelectorIndexed, resultSelector) :
  65                                 source.SelectMany (collectionSelector, resultSelector);
  66                 }
  67
  68                 internal override IList<IEnumerable<TResult>> GetEnumerablesIndexed (QueryOptions options)
  69                 {
  70                         return Parent.GetOrderedEnumerables (options)
  71                                 .Select ((i) => GetEnumerableInternal (i,
  72                                                                        (kv) => collectionSelectorIndexed (kv.Value, (int)kv.Key),
  73                                                                        (e, c) => resultSelector (e.Value, c)))
  74                                 .ToList ();
  75                 }
  76
  77                 internal override IList<IEnumerable<TResult>> GetEnumerablesNonIndexed (QueryOptions options)
  78                 {
  79                         return Parent.GetEnumerables (options)
  80                                 .Select ((i) => GetEnumerableInternal (i,
  81                                                                        collectionSelector,
  82                                                                        (e, c) => resultSelector (e, c)))
  83                                 .ToList ();
  84                 }
  85
  86                 // This one is gonna be tricky
  87                 internal override IList<IEnumerable<KeyValuePair<long, TResult>>> GetOrderedEnumerables (QueryOptions options)
  88                 {
  89                         throw new NotImplementedException ();
  90                 }
  91
  92                 IEnumerable<TResult> GetEnumerableInternal<T> (IEnumerable<T> source,
  93                                                                Func<T, IEnumerable<TCollection>> collectionner,
  94                                                                Func<T, TCollection, TResult> packer)
  95                 {
  96                         foreach (T element in source)
  97                                 foreach (TCollection item in collectionner (element))
  98                                         yield return packer (element, item);
  99                 }
 100
 101                 IEnumerable<KeyValuePair<long, TResult>> GetOrderedEnumerableInternal (IEnumerable<KeyValuePair<long, TSource>> source,
 102                                                                                        Barrier barrier)
 103                 {
 104                         foreach (KeyValuePair<long, TSource> element in source) {
 105                                 IEnumerable<TCollection> collection = collectionSelectorIndexed (element.Value, (int)element.Key);
 106
 107                                 foreach (TCollection item in collection)
 108                                         yield return new KeyValuePair<long, TResult> (-1, resultSelector (element.Value, item));
 109                         }
 110                 }
 111         }
 112 }
 113
 114 #endif