/Dependencies/boo/src/Boo.Lang/BooHashCodeProvider.cs
C# | 74 lines | 42 code | 7 blank | 25 comment | 5 complexity | cbdc441030d1851b623bf409475378c4 MD5 | raw file
Possible License(s): GPL-2.0
- #region license
- // Copyright (c) 2004, Rodrigo B. de Oliveira (rbo@acm.org)
- // All rights reserved.
- //
- // Redistribution and use in source and binary forms, with or without modification,
- // are permitted provided that the following conditions are met:
- //
- // * Redistributions of source code must retain the above copyright notice,
- // this list of conditions and the following disclaimer.
- // * Redistributions in binary form must reproduce the above copyright notice,
- // this list of conditions and the following disclaimer in the documentation
- // and/or other materials provided with the distribution.
- // * Neither the name of Rodrigo B. de Oliveira nor the names of its
- // contributors may be used to endorse or promote products derived from this
- // software without specific prior written permission.
- //
- // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
- // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
- // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- // THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- #endregion
- namespace Boo.Lang
- {
- using System;
- using System.Collections;
- [Serializable]
- public class BooHashCodeProvider : IEqualityComparer
- {
- public static readonly IEqualityComparer Default = new BooHashCodeProvider();
- private BooHashCodeProvider()
- {
- }
- public int GetHashCode(object o)
- {
- if (null != o)
- {
- Array array = o as Array;
- if (null != array)
- {
- return GetArrayHashCode(array);
- }
- return o.GetHashCode();
- }
- return 0;
- }
-
- public new bool Equals(object lhs, object rhs)
- {
- return BooComparer.Default.Compare(lhs, rhs) == 0;
- }
-
- public int GetArrayHashCode(Array array)
- {
- int code = 1;
- int position = 0;
- foreach (object item in array)
- {
- code ^= GetHashCode(item)*(++position);
- }
- return code;
- }
- }
- }