62 lines
1.6 KiB
C#
62 lines
1.6 KiB
C#
// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
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// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
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using System.Collections;
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using System.Collections.Generic;
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namespace Microsoft.Internal.Web.Utils
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{
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internal class HashCodeCombiner
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{
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private long _combinedHash64 = 0x1505L;
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public int CombinedHash
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{
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get { return _combinedHash64.GetHashCode(); }
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}
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public HashCodeCombiner Add(IEnumerable e)
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{
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if (e == null)
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{
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Add(0);
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}
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else
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{
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var count = 0;
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foreach (object o in e)
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{
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Add(o);
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count++;
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}
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Add(count);
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}
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return this;
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}
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public HashCodeCombiner Add(int i)
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{
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_combinedHash64 = ((_combinedHash64 << 5) + _combinedHash64) ^ i;
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return this;
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}
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public HashCodeCombiner Add(object o)
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{
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var hashCode = (o != null) ? o.GetHashCode() : 0;
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Add(hashCode);
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return this;
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}
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public HashCodeCombiner Add<TValue>(TValue value, IEqualityComparer<TValue> comparer)
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{
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var hashCode = value != null ? comparer.GetHashCode(value) : 0;
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return Add(hashCode);
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}
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public static HashCodeCombiner Start()
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{
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return new HashCodeCombiner();
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}
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}
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}
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