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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
using System.Collections.Generic;
using System.Globalization;
namespace System.Reactive
{
abstract class Either<TLeft, TRight>
{
Either()
{
}
public static Either<TLeft, TRight> CreateLeft(TLeft value)
{
return new Either<TLeft, TRight>.Left(value);
}
public static Either<TLeft, TRight> CreateRight(TRight value)
{
return new Either<TLeft, TRight>.Right(value);
}
public abstract TResult Switch<TResult>(Func<TLeft, TResult> caseLeft, Func<TRight, TResult> caseRight);
public abstract void Switch(Action<TLeft> caseLeft, Action<TRight> caseRight);
public sealed class Left : Either<TLeft, TRight>, IEquatable<Left>
{
public TLeft Value { get; private set; }
public Left(TLeft value)
{
Value = value;
}
public override TResult Switch<TResult>(Func<TLeft, TResult> caseLeft, Func<TRight, TResult> caseRight)
{
return caseLeft(Value);
}
public override void Switch(Action<TLeft> caseLeft, Action<TRight> caseRight)
{
caseLeft(Value);
}
public bool Equals(Left other)
{
if (other == this)
return true;
if (other == null)
return false;
return EqualityComparer<TLeft>.Default.Equals(Value, other.Value);
}
public override bool Equals(object obj)
{
return Equals(obj as Left);
}
public override int GetHashCode()
{
return EqualityComparer<TLeft>.Default.GetHashCode(Value);
}
public override string ToString()
{
return string.Format(CultureInfo.CurrentCulture, "Left({0})", Value);
}
}
public sealed class Right : Either<TLeft, TRight>, IEquatable<Right>
{
public TRight Value { get; private set; }
public Right(TRight value)
{
Value = value;
}
public override TResult Switch<TResult>(Func<TLeft, TResult> caseLeft, Func<TRight, TResult> caseRight)
{
return caseRight(Value);
}
public override void Switch(Action<TLeft> caseLeft, Action<TRight> caseRight)
{
caseRight(Value);
}
public bool Equals(Right other)
{
if (other == this)
return true;
if (other == null)
return false;
return EqualityComparer<TRight>.Default.Equals(Value, other.Value);
}
public override bool Equals(object obj)
{
return Equals(obj as Right);
}
public override int GetHashCode()
{
return EqualityComparer<TRight>.Default.GetHashCode(Value);
}
public override string ToString()
{
return string.Format(CultureInfo.CurrentCulture, "Right({0})", Value);
}
}
}
}
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