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/* ****************************************************************************
*
* Copyright (c) Microsoft Corporation. All rights reserved.
*
* This software is subject to the Microsoft Public License (Ms-PL).
* A copy of the license can be found in the license.htm file included
* in this distribution.
*
* You must not remove this notice, or any other, from this software.
*
* ***************************************************************************/
namespace System.Web.Mvc.ExpressionUtil {
using System;
using System.Collections;
// based on System.Web.Util.HashCodeCombiner
internal class HashCodeCombiner {
private long _combinedHash64 = 0x1505L;
public void AddFingerprint(ExpressionFingerprint fingerprint) {
if (fingerprint != null) {
fingerprint.AddToHashCodeCombiner(this);
}
else {
AddInt32(0);
}
}
public void AddEnumerable(IEnumerable e) {
if (e == null) {
AddInt32(0);
}
else {
int count = 0;
foreach (object o in e) {
AddObject(o);
count++;
}
AddInt32(count);
}
}
public void AddInt32(int i) {
_combinedHash64 = ((_combinedHash64 << 5) + _combinedHash64) ^ i;
}
public void AddObject(object o) {
int oHashCode = (o != null) ? o.GetHashCode() : 0;
AddInt32(oHashCode);
}
public int CombinedHash {
get {
return _combinedHash64.GetHashCode();
}
}
}
}
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