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/Dependencies/boo/src/Boo.Lang/BooHashCodeProvider.cs

https://github.com/w4x/boolangstudio
C# | 74 lines | 42 code | 7 blank | 25 comment | 5 complexity | cbdc441030d1851b623bf409475378c4 MD5 | raw file
Possible License(s): GPL-2.0
  1. #region license
  2. // Copyright (c) 2004, 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. namespace Boo.Lang
  29. {
  30. using System;
  31. using System.Collections;
  32. [Serializable]
  33. public class BooHashCodeProvider : IEqualityComparer
  34. {
  35. public static readonly IEqualityComparer Default = new BooHashCodeProvider();
  36. private BooHashCodeProvider()
  37. {
  38. }
  39. public int GetHashCode(object o)
  40. {
  41. if (null != o)
  42. {
  43. Array array = o as Array;
  44. if (null != array)
  45. {
  46. return GetArrayHashCode(array);
  47. }
  48. return o.GetHashCode();
  49. }
  50. return 0;
  51. }
  52. public new bool Equals(object lhs, object rhs)
  53. {
  54. return BooComparer.Default.Compare(lhs, rhs) == 0;
  55. }
  56. public int GetArrayHashCode(Array array)
  57. {
  58. int code = 1;
  59. int position = 0;
  60. foreach (object item in array)
  61. {
  62. code ^= GetHashCode(item)*(++position);
  63. }
  64. return code;
  65. }
  66. }
  67. }