mcs/class/System.Core/System.Linq/Internal/QueryNodes/QuerySelectNode.cs

   1 #if NET_4_0
   2 //
   3 // QuerySelectNode.cs
   4 //
   5 // Author:
   6 //       Jérémie "Garuma" Laval <jeremie.laval@gmail.com>
   7 //
   8 // Copyright (c) 2010 Jérémie "Garuma" Laval
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining a copy
  11 // of this software and associated documentation files (the "Software"), to deal
  12 // in the Software without restriction, including without limitation the rights
  13 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  14 // copies of the Software, and to permit persons to whom the Software is
  15 // furnished to do so, subject to the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be included in
  18 // all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  21 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  22 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  23 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  24 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  25 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  26 // THE SOFTWARE.
  27
  28 using System;
  29 using System.Linq;
  30 using System.Collections.Generic;
  31 using System.Collections.Concurrent;
  32
  33 namespace System.Linq
  34 {
  35         internal class QuerySelectNode<TResult, TSource> : QueryStreamNode<TResult, TSource>
  36         {
  37                 Func<TSource, int, TResult> indexedSelector;
  38                 Func<TSource, TResult> selector;
  39
  40                 internal QuerySelectNode (QueryBaseNode<TSource> parent, Func<TSource, TResult> selector)
  41                         : base (parent, false)
  42                 {
  43                         this.selector = selector;
  44                 }
  45
  46                 internal QuerySelectNode (QueryBaseNode<TSource> parent, Func<TSource, int, TResult> selector)
  47                         : base (parent, true)
  48                 {
  49                         this.indexedSelector = selector;
  50                 }
  51
  52                 internal override IEnumerable<TResult> GetSequential ()
  53                 {
  54                         if (IsIndexed)
  55                                 return Parent.GetSequential ().Select (indexedSelector);
  56                         else
  57                                 return Parent.GetSequential ().Select (selector);
  58                 }
  59
  60                 internal override IList<IEnumerable<TResult>> GetEnumerables (QueryOptions options)
  61                 {
  62                         if (IsIndexed) {
  63                                 IList<IEnumerable<KeyValuePair<long, TSource>>> sources = Parent.GetOrderedEnumerables (options);
  64                                 IEnumerable<TResult>[] results = new IEnumerable<TResult>[sources.Count];
  65                                 for (int i = 0; i < results.Length; i++)
  66                                         results[i] = sources[i].Select ((e) => indexedSelector (e.Value, (int)e.Key));
  67                                 return results;
  68                         } else {
  69                                 IList<IEnumerable<TSource>> sources = Parent.GetEnumerables (options);
  70                                 IEnumerable<TResult>[] results = new IEnumerable<TResult>[sources.Count];
  71
  72                                 for (int i = 0; i < results.Length; i++)
  73                                         results[i] = sources[i].Select (selector);
  74                                 return results;
  75                         }
  76                 }
  77
  78                 internal override IList<IEnumerable<KeyValuePair<long, TResult>>> GetOrderedEnumerables (QueryOptions options)
  79                 {
  80                         IList<IEnumerable<KeyValuePair<long, TSource>>> sources = Parent.GetOrderedEnumerables (options);
  81                         IEnumerable<KeyValuePair<long, TResult>>[] results = new IEnumerable<KeyValuePair<long, TResult>>[sources.Count];
  82
  83                         if (IsIndexed) {
  84                                 for (int i = 0; i < results.Length; i++)
  85                                         results[i] = sources[i].
  86                                                 Select ((e) => new KeyValuePair<long, TResult> (e.Key, indexedSelector (e.Value, (int)e.Key)));
  87                         } else {
  88                                 for (int i = 0; i < results.Length; i++)
  89                                         results[i] = sources[i].
  90                                                 Select ((e) => new KeyValuePair<long, TResult> (e.Key, selector (e.Value)));
  91                         }
  92
  93                         return results;
  94                 }
  95         }
  96 }
  97 #endif