private static void Copy <T>(
ISet <T> source,
ISet <T> target,
MemberSettings settings,
ReferencePairCollection referencePairs)
{
if (Is.IsFixedSize(source, target) && source.Count != target.Count)
{
throw State.Copy.Throw.CannotCopyFixesSizeCollections(source, target, settings);
}
if (settings.IsImmutable(typeof(T)))
{
using (var borrow = HashSetPool <T> .Borrow(EqualityComparer <T> .Default))
{
borrow.Value.UnionWith(source);
target.IntersectWith(borrow.Value);
target.UnionWith(borrow.Value);
return;
}
}
switch (settings.ReferenceHandling)
{
case ReferenceHandling.Throw:
break;
case ReferenceHandling.References:
using (var borrow = HashSetPool <T> .Borrow((x, y) => ReferenceEquals(x, y), x => RuntimeHelpers.GetHashCode(x)))
{
borrow.Value.UnionWith(source);
target.IntersectWith(borrow.Value);
target.UnionWith(borrow.Value);
}
break;
case ReferenceHandling.Structural:
IEqualityComparer <T> comparer;
if (!Set.TryGetComparer(source, out comparer))
{
comparer = EqualityComparer <T> .Default;
}
var copyIngComparer = new CopyingComparer <T>(comparer, settings, referencePairs);
using (var borrow = HashSetPool <T> .Borrow(copyIngComparer))
{
borrow.Value.UnionWith(source);
target.IntersectWith(borrow.Value);
copyIngComparer.StartCopying();
target.UnionWith(borrow.Value);
}
return;
default:
throw new ArgumentOutOfRangeException();
}
}
private bool ItemsEquals(ISet <T> x, ISet <T> y, Func <T, T, bool> compare, Func <T, int> getHashCode)
{
using (var borrow = HashSetPool <T> .Borrow(compare, getHashCode))
{
borrow.Value.UnionWith(x);
var result = borrow.Value.SetEquals(y);
return(result);
}
}
private void AddDiffs(
DiffBuilder collectionBuilder,
IDictionary <TKey, TValue> x,
IDictionary <TKey, TValue> y,
MemberSettings settings)
{
using (var borrow = HashSetPool <TKey> .Borrow(EqualityComparer <TKey> .Default.Equals, EqualityComparer <TKey> .Default.GetHashCode))
{
borrow.Value.UnionWith(x.Keys);
borrow.Value.UnionWith(y.Keys);
foreach (var key in borrow.Value)
{
var xv = x.ElementAtOrMissing(key);
var yv = y.ElementAtOrMissing(key);
collectionBuilder.UpdateCollectionItemDiff(xv, yv, key, settings);
}
}
}
// ReSharper disable once UnusedParameter.Local
private void AddDiffs(
DiffBuilder collectionBuilder,
ISet <T> x,
ISet <T> y,
MemberSettings settings)
{
if (typeof(T).Implements <IEquatable <T> >())
{
using (var borrow = HashSetPool <T> .Borrow(EqualityComparer <T> .Default.Equals, EqualityComparer <T> .Default.GetHashCode))
{
AddItemDiffs(collectionBuilder, x, y, borrow.Value);
return;
}
}
switch (settings.ReferenceHandling)
{
case ReferenceHandling.Throw:
throw Throw.ShouldNeverGetHereException("ReferenceHandling should be checked before");
case ReferenceHandling.References:
using (var borrow = HashSetPool <T> .Borrow((xi, yi) => ReferenceEquals(xi, yi), item => RuntimeHelpers.GetHashCode(item)))
{
AddItemDiffs(collectionBuilder, x, y, borrow.Value);
return;
}
case ReferenceHandling.Structural:
using (var borrow = HashSetPool <T> .Borrow((xi, yi) => EqualBy.MemberValues(xi, yi, settings), xi => 0))
{
AddItemDiffs(collectionBuilder, x, y, borrow.Value);
return;
}
default:
throw new ArgumentOutOfRangeException();
}
}