class/Mono.C5/UserGuideExamples/MultiCollection.cs

   1 /*
   2  Copyright (c) 2003-2006 Niels Kokholm and Peter Sestoft
   3  Permission is hereby granted, free of charge, to any person obtaining a copy
   4  of this software and associated documentation files (the "Software"), to deal
   5  in the Software without restriction, including without limitation the rights
   6  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   7  copies of the Software, and to permit persons to whom the Software is
   8  furnished to do so, subject to the following conditions:
   9
  10  The above copyright notice and this permission notice shall be included in
  11  all copies or substantial portions of the Software.
  12
  13  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  14  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  15  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  16  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  17  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  18  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  19  SOFTWARE.
  20 */
  21
  22
  23 using System;
  24 using C5;
  25 using SCG = System.Collections.Generic;
  26
  27 namespace MultiCollection
  28 {
  29   class BasicCollectionValue<T> : CollectionValueBase<T>, ICollectionValue<T>
  30   {
  31     SCG.IEnumerable<T> enumerable;
  32     Fun<T> chooser;
  33     int count;
  34     //TODO: add delegate for checking validity!
  35
  36     public BasicCollectionValue(SCG.IEnumerable<T> e, Fun<T> chooser, int c) { enumerable = e; count = c; this.chooser = chooser; }
  37
  38     public override int Count { get { return count; } }
  39
  40     public override Speed CountSpeed { get { return Speed.Constant; } }
  41
  42     public override bool IsEmpty { get { return count == 0; } }
  43
  44     public override T Choose() { return chooser(); }
  45
  46     public override System.Collections.Generic.IEnumerator<T> GetEnumerator()
  47     {
  48       return enumerable.GetEnumerator();
  49     }
  50   }
  51
  52   interface IMultiCollection<K, V>
  53   {
  54     SCG.IEqualityComparer<K> KeyEqualityComparer { get;}
  55     SCG.IEqualityComparer<V> ValueEqualityComparer { get;}
  56     bool Add(K k, V v);
  57     bool Remove(K k, V v);
  58     ICollectionValue<V> this[K k] { get;}
  59     ICollectionValue<K> Keys { get;}
  60     SCG.IEnumerable<V> Values { get;}
  61
  62   }
  63
  64   class BasicMultiCollection<K, V, W, U> : IMultiCollection<K, V>//: IDictionary<K, W>
  65   where W : ICollection<V>, new()
  66       where U : IDictionary<K, W>, new()
  67   {
  68     U dict = new U();
  69
  70     public SCG.IEqualityComparer<K> KeyEqualityComparer { get { return EqualityComparer<K>.Default; } }
  71
  72     public SCG.IEqualityComparer<V> ValueEqualityComparer { get { return EqualityComparer<V>.Default; } } //TODO: depends on W!
  73
  74     public bool Add(K k, V v)
  75     {
  76       W w;
  77       if (!dict.Find(k, out w))
  78         dict.Add(k,w = new W());
  79       return w.Add(v);
  80     }
  81
  82     public bool Remove(K k, V v)
  83     {
  84       W w;
  85       if (dict.Find(k, out w) && w.Remove(v))
  86       {
  87         if (w.Count == 0)
  88           dict.Remove(k);
  89         return true;
  90       }
  91       return false;
  92     }
  93
  94     public ICollectionValue<V> this[K k] { get { return dict[k]; } }
  95
  96     public ICollectionValue<K> Keys { get { return dict.Keys; } }
  97
  98     public SCG.IEnumerable<V> Values
  99     {
 100       get
 101       {
 102         foreach (W w in dict.Values)
 103           foreach (V v in w)
 104             yield return v;
 105       }
 106     }
 107   }
 108
 109   class WordIndex : BasicMultiCollection<string,int,HashSet<int>,HashDictionary<string,HashSet<int>>>
 110   {
 111   }
 112
 113   class MyTest
 114   {
 115     public static void Main(String[] args)
 116     {
 117       WordIndex wi = new WordIndex();
 118       wi.Add("ja", 2);
 119       wi.Add("nej", 4);
 120       wi.Add("ja", 7);
 121       foreach (string s in wi.Keys)
 122       {
 123         Console.WriteLine(s + " -->");
 124         foreach (int line in wi[s])
 125         {
 126           Console.WriteLine(" " + line);
 127         }
 128       }
 129     }
 130   }
 131 }