Generic Pair
//------------------------------------------------------------------------------
// <copyright file="Pair.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Web.Util {
using System;
// Generic Pair class. Overrides Equals() and GetHashCode(), so it can be used as a dictionary key.
internal sealed class Pair<TFirst, TSecond> {
private readonly TFirst _first;
private readonly TSecond _second;
public Pair(TFirst first, TSecond second) {
_first = first;
_second = second;
}
public TFirst First {
get {
return _first;
}
}
public TSecond Second {
get {
return _second;
}
}
public override bool Equals(object obj) {
if (obj == this) {
return true;
}
Pair<TFirst, TSecond> other = obj as Pair<TFirst, TSecond>;
return (other != null) &&
(((other._first == null) && (_first == null)) ||
((other._first != null) && other._first.Equals(_first))) &&
(((other._second == null) && (_second == null)) ||
((other._second != null) && other._second.Equals(_second)));
}
public override int GetHashCode() {
int a = (_first == null) ? 0 : _first.GetHashCode();
int b = (_second == null) ? 0 : _second.GetHashCode();
return CombineHashCodes(a, b);
}
// Copied from ndp\fx\src\xsp\System\Web\Util\HashCodeCombiner.cs
private static int CombineHashCodes(int h1, int h2) {
return ((h1 << 5) + h1) ^ h2;
}
}
}
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