/// <summary>
/// Remove duplicates found in the equivalence mappings.
/// </summary>
public IEnumerable <NuGetFramework> Reduce(IEnumerable <NuGetFramework> frameworks)
{
// order first so we get consistent results for equivalent frameworks
var input = frameworks.OrderBy(f => f.DotNetFrameworkName, StringComparer.OrdinalIgnoreCase).ToArray();
var comparer = new NuGetFrameworkFullComparer();
for (var i = 0; i < input.Length; i++)
{
var dupe = false;
IEnumerable <NuGetFramework> eqFrameworks = null;
if (!_mappings.TryGetEquivalentFrameworks(input[i], out eqFrameworks))
{
eqFrameworks = new List <NuGetFramework>()
{
input[i]
};
}
for (var j = i + 1; !dupe && j < input.Length; j++)
{
dupe = eqFrameworks.Contains(input[j], comparer);
}
if (!dupe)
{
yield return(input[i]);
}
}
yield break;
}
/// <summary>
/// Creates a FrameworkReducer using custom framework mappings.
/// </summary>
public FrameworkReducer(IFrameworkNameProvider mappings, IFrameworkCompatibilityProvider compat)
{
_mappings = mappings;
_compat = compat;
_fullComparer = new NuGetFrameworkFullComparer();
_fwNameComparer = new NuGetFrameworkNameComparer();
}
public static T GetNearest <T>(IEnumerable <T> items, NuGetFramework framework, Func <T, NuGetFramework> selector) where T : class
{
var reducer = new FrameworkReducer();
var comparer = new NuGetFrameworkFullComparer();
var frameworkLookup = items.ToDictionary(item => selector(item));
var nearest = reducer.GetNearest(framework, frameworkLookup.Keys) ??
frameworkLookup.Where(f => comparer.Equals(f.Key, NuGetFramework.AnyFramework))
.Select(f => f.Key)
.FirstOrDefault();
if (nearest == null)
{
return(null);
}
return(frameworkLookup[nearest]);
}
