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Either usability improvements #1132

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merged 1 commit into from
Jul 8, 2015
Merged

Either usability improvements #1132

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88 changes: 88 additions & 0 deletions src/core/Akka/Util/Either.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,8 @@
// </copyright>
//-----------------------------------------------------------------------

using System;

namespace Akka.Util
{
public abstract class Either<TA,TB>
Expand Down Expand Up @@ -39,8 +41,54 @@ public Left<TA, TB> ToLeft()
{
return new Left<TA, TB>(Left);
}

public static implicit operator Either<TA, TB>(Left<TA> left)
{
return new Left<TA, TB>(left.Value);
}

public static implicit operator Either<TA, TB>(Right<TB> right)
{
return new Right<TA, TB>(right.Value);
}

public Either<TRes1, TRes2> Map<TRes1, TRes2>(Func<TA, TRes1> map1, Func<TB, TRes2> map2)
{
if (IsLeft)
return new Left<TRes1, TRes2>(map1(ToLeft().Value));
return new Right<TRes1, TRes2>(map2(ToRight().Value));
}

public Either<TRes, TB> MapLeft<TRes>(Func<TA, TRes> map)
{
return Map(map, x => x);
}

public Either<TA, TRes> MapRight<TRes>(Func<TB, TRes> map)
{
return Map(x => x, map);
}

public TRes Fold<TRes>(Func<TA, TRes> left, Func<TB, TRes> right)
{
return IsLeft ? left(ToLeft().Value) : right(ToRight().Value);
}
}

public static class Either
{
public static Left<T> Left<T>(T value)
{
return new Left<T>(value);
}

public static Right<T> Right<T>(T value)
{
return new Right<T>(value);
}
}


public class Right<TA, TB> : Either<TA, TB>
{
public Right(TB b) : base(default(TA), b)
Expand All @@ -63,6 +111,26 @@ public override bool IsRight
}
}

public class Right<T>
{
public Right(T value)
{
Value = value;
}

public T Value { get; private set; }

public bool IsLeft
{
get { return false; }
}

public bool IsRight
{
get { return true; }
}
}

public class Left<TA, TB> : Either<TA, TB>
{
public Left(TA a) : base(a, default(TB))
Expand All @@ -84,5 +152,25 @@ public override bool IsRight
get { return Left; }
}
}

public class Left<T>
{
public Left(T value)
{
Value = value;
}

public T Value { get; private set; }

public bool IsLeft
{
get { return true; }
}

public bool IsRight
{
get { return false; }
}
}
}