54 lines
1.2 KiB
C#
54 lines
1.2 KiB
C#
// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
|
|
|
|
using System.Collections;
|
|
|
|
namespace Microsoft.Internal.Web.Utils
|
|
{
|
|
internal class HashCodeCombiner
|
|
{
|
|
private long _combinedHash64 = 0x1505L;
|
|
|
|
public int CombinedHash
|
|
{
|
|
get { return _combinedHash64.GetHashCode(); }
|
|
}
|
|
|
|
public HashCodeCombiner Add(IEnumerable e)
|
|
{
|
|
if (e == null)
|
|
{
|
|
Add(0);
|
|
}
|
|
else
|
|
{
|
|
int count = 0;
|
|
foreach (object o in e)
|
|
{
|
|
Add(o);
|
|
count++;
|
|
}
|
|
Add(count);
|
|
}
|
|
return this;
|
|
}
|
|
|
|
public HashCodeCombiner Add(int i)
|
|
{
|
|
_combinedHash64 = ((_combinedHash64 << 5) + _combinedHash64) ^ i;
|
|
return this;
|
|
}
|
|
|
|
public HashCodeCombiner Add(object o)
|
|
{
|
|
int hashCode = (o != null) ? o.GetHashCode() : 0;
|
|
Add(hashCode);
|
|
return this;
|
|
}
|
|
|
|
public static HashCodeCombiner Start()
|
|
{
|
|
return new HashCodeCombiner();
|
|
}
|
|
}
|
|
}
|