src/Boo.Lang/Runtime/DispatcherKey.cs

   1 #region license
   2 // Copyright (c) 2003, 2004, 2005 Rodrigo B. de Oliveira (rbo@acm.org)
   3 // All rights reserved.
   4 //
   5 // Redistribution and use in source and binary forms, with or without modification,
   6 // are permitted provided that the following conditions are met:
   7 //
   8 //     * Redistributions of source code must retain the above copyright notice,
   9 //     this list of conditions and the following disclaimer.
  10 //     * Redistributions in binary form must reproduce the above copyright notice,
  11 //     this list of conditions and the following disclaimer in the documentation
  12 //     and/or other materials provided with the distribution.
  13 //     * Neither the name of Rodrigo B. de Oliveira nor the names of its
  14 //     contributors may be used to endorse or promote products derived from this
  15 //     software without specific prior written permission.
  16 //
  17 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
  18 // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  19 // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  20 // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
  21 // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22 // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  23 // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  24 // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  25 // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26 // THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27 #endregion
  28
  29
  30 using System;
  31 using System.Collections.Generic;
  32
  33 namespace Boo.Lang.Runtime
  34 {
  35         public class DispatcherKey
  36         {
  37                 public static readonly Type[] NoArguments = new Type[0];
  38
  39                 public static readonly IEqualityComparer<DispatcherKey> EqualityComparer = new _EqualityComparer();
  40
  41                 private readonly Type _type;
  42                 private readonly string _name;
  43                 private readonly Type[] _arguments;
  44
  45                 public DispatcherKey(Type type, string name) : this(type, name, NoArguments)
  46                 {
  47                 }
  48
  49                 public DispatcherKey(Type type, string name, Type[] arguments)
  50                 {
  51                         _type = type;
  52                         _name = name;
  53                         _arguments = arguments;
  54                 }
  55
  56                 public Type[] Arguments
  57                 {
  58                         get { return _arguments;  }
  59                 }
  60
  61                 class _EqualityComparer : IEqualityComparer<DispatcherKey>
  62                 {
  63                         public int GetHashCode(DispatcherKey key)
  64                         {
  65                                 return key._type.GetHashCode() ^ key._name.GetHashCode() ^ key._arguments.Length;
  66                         }
  67
  68                         public bool Equals(DispatcherKey x, DispatcherKey y)
  69                         {
  70                                 if (x._type != y._type) return false;
  71                                 if (x._arguments.Length != y._arguments.Length) return false;
  72                                 if (x._name != y._name) return false;
  73                                 for (int i = 0; i < x._arguments.Length; ++i)
  74                                 {
  75                                         if (x._arguments[i] != y._arguments[i]) return false;
  76                                 }
  77                                 return true;
  78                         }
  79                 }
  80         }
  81 }