boo-lang /src/Boo.Lang/BooHashCodeProvider.cs

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#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;
		}
	}
}
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