mcs/class/Mono.CodeContracts/Mono.CodeContracts.Static.DataStructures/DoubleImmutableMap.cs

   1 //
   2 // DoubleImmutableMap.cs
   3 //
   4 // Authors:
   5 //      Alexander Chebaturkin (chebaturkin@gmail.com)
   6 //
   7 // Copyright (C) 2011 Alexander Chebaturkin
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 using System;
  30 using System.Collections.Generic;
  31
  32 namespace Mono.CodeContracts.Static.DataStructures {
  33         class DoubleImmutableMap<A, B, C>
  34                 where A : IEquatable<A>
  35                 where B : IEquatable<B> {
  36                 private readonly B[] EmptyCache = new B[0];
  37                 private readonly IImmutableMap<A, IImmutableMap<B, C>> map;
  38
  39                 private DoubleImmutableMap (IImmutableMap<A, IImmutableMap<B, C>> map)
  40                 {
  41                         this.map = map;
  42                 }
  43
  44                 public C this [A key1, B key2]
  45                 {
  46                         get
  47                         {
  48                                 IImmutableMap<B, C> inner = this.map [key1];
  49                                 if (inner == null)
  50                                         return default(C);
  51                                 return inner [key2];
  52                         }
  53                 }
  54
  55                 public int Keys1Count
  56                 {
  57                         get { return this.map.Count; }
  58                 }
  59
  60                 public IEnumerable<A> Keys1
  61                 {
  62                         get { return this.map.Keys; }
  63                 }
  64
  65                 public DoubleImmutableMap<A, B, C> Add (A key1, B key2, C value)
  66                 {
  67                         IImmutableMap<B, C> immutableMap = this.map [key1] ?? ImmutableMap<B, C>.Empty;
  68                         return new DoubleImmutableMap<A, B, C> (this.map.Add (key1, immutableMap.Add (key2, value)));
  69                 }
  70
  71                 public DoubleImmutableMap<A, B, C> RemoveAll (A key1)
  72                 {
  73                         return new DoubleImmutableMap<A, B, C> (this.map.Remove (key1));
  74                 }
  75
  76                 public DoubleImmutableMap<A, B, C> Remove (A key1, B key2)
  77                 {
  78                         IImmutableMap<B, C> inner = this.map [key1];
  79                         if (inner == null)
  80                                 return this;
  81                         IImmutableMap<B, C> newInner = inner.Remove (key2);
  82                         if (newInner == inner)
  83                                 return this;
  84                         return new DoubleImmutableMap<A, B, C> (this.map.Add (key1, newInner));
  85                 }
  86
  87                 public static DoubleImmutableMap<A, B, C> Empty (Func<A, int> uniqueIdGenerator)
  88                 {
  89                         return new DoubleImmutableMap<A, B, C> (ImmutableIntKeyMap<A, IImmutableMap<B, C>>.Empty (uniqueIdGenerator));
  90                 }
  91
  92                 public bool Contains (A key1, B key2)
  93                 {
  94                         IImmutableMap<B, C> inner = this.map [key1];
  95                         if (inner == null)
  96                                 return false;
  97                         return inner.ContainsKey (key2);
  98                 }
  99
 100                 public bool ContainsKey1 (A key1)
 101                 {
 102                         return this.map.ContainsKey (key1);
 103                 }
 104
 105                 public int Keys2Count (A key1)
 106                 {
 107                         if (key1 == null)
 108                                 return 0;
 109                         IImmutableMap<B, C> inner = this.map [key1];
 110                         if (inner == null)
 111                                 return 0;
 112                         return inner.Count;
 113                 }
 114
 115                 public IEnumerable<B> Keys2 (A key1)
 116                 {
 117                         if (key1 == null)
 118                                 return this.EmptyCache;
 119
 120                         IImmutableMap<B, C> inner = this.map [key1];
 121                         if (inner == null)
 122                                 return this.EmptyCache;
 123                         return inner.Keys;
 124                 }
 125         }
 126 }