public static IReactiveSet <T> Except <T>(this IReactiveSet <T> first, IReactiveSet <T> second)
{
if (first == null)
{
throw new ArgumentNullException(nameof(first));
}
if (second == null)
{
throw new ArgumentNullException(nameof(second));
}
var obs1 = first.AsObservable().Select(change => new ReactiveSetChange <T>(change.ChangeReason, change.Items.Where(x => !second.Contains(x))));
var obs2 = second.AsObservable()
.Select(change => {
if (change.ChangeReason == ReactiveSetChangeReason.Add)
{
return(new ReactiveSetChange <T>(ReactiveSetChangeReason.Remove, change.Items));
}
else
{
return(new ReactiveSetChange <T>(ReactiveSetChangeReason.Add, change.Items.Where(first.Contains)));
}
});
return(obs1.Merge(obs2).ToReactiveSet(x => first.Contains(x) && !second.Contains(x)));
}
public static IReactiveSet <T> ObserveOnDispatcher <T>(this IReactiveSet <T> set)
{
if (set == null)
{
throw new ArgumentNullException(nameof(set));
}
return(set.AsObservable().ObserveOnDispatcher().ToSet(set.Contains));
}
public static ICollectedReactiveSet <T> Collect <T>(this IReactiveSet <T> set)
{
if (set == null)
{
throw new ArgumentNullException(nameof(set));
}
return(new ReactiveSet <T>(set.AsObservable()));
}
public static IObservable <int> Count <T>(this IReactiveSet <T> set)
{
if (set == null)
{
throw new ArgumentNullException(nameof(set));
}
return(set.Aggregate(0, (x, _) => x + 1, (x, _) => x - 1));
}
public static IObservable <int> Product(this IReactiveSet <int> set)
{
if (set == null)
{
throw new ArgumentNullException(nameof(set));
}
return(set.Aggregate(1, (x, y) => x * y, (x, y) => x / y));
}
public static IObservable <T> ElementsAdded <T>(this IReactiveSet <T> set)
{
if (set == null)
{
throw new ArgumentNullException(nameof(set));
}
return(set
.AsObservable()
.Where(x => x.ChangeReason == ReactiveSetChangeReason.Add)
.SelectMany(x => x.Items));
}
private static IObservable <IImmutableSet <T> > ToImmutableSets <T>(this IReactiveSet <T> set, Func <IImmutableSet <T> > setFactory)
{
if (set == null)
{
throw new ArgumentNullException(nameof(set));
}
if (setFactory == null)
{
throw new ArgumentNullException(nameof(setFactory));
}
return(set.Aggregate(ImmutableHashSet <T> .Empty, (x, y) => x.Add(y), (x, y) => x.Remove(y)));
}
public static IReactiveSet <T> SymmetricExcept <T>(this IReactiveSet <T> first, IReactiveSet <T> second)
{
if (first == null)
{
throw new ArgumentNullException(nameof(first));
}
if (second == null)
{
throw new ArgumentNullException(nameof(second));
}
return(first.Union(second).Except(first.Intersection(second)));
}
public static ICollectedReactiveSet <TResult> Select <T, TResult>(this IReactiveSet <T> set, Func <T, TResult> filter)
{
if (set == null)
{
throw new ArgumentNullException(nameof(set));
}
if (filter == null)
{
throw new ArgumentNullException(nameof(filter));
}
return(new SetSelectImplementation <T, TResult>(set.AsObservable(), filter));
}
public static IObservable <TResult> Aggregate <T, TResult>(this IReactiveSet <T> set, TResult seed, Func <TResult, T, TResult> addFunc, Func <TResult, T, TResult> removeFunc)
{
if (set == null)
{
throw new ArgumentNullException(nameof(set));
}
if (addFunc == null)
{
throw new ArgumentNullException(nameof(addFunc));
}
if (removeFunc == null)
{
throw new ArgumentNullException(nameof(removeFunc));
}
return(Observable.Create <TResult>(observer => {
var current = seed;
observer.OnNext(current);
IDisposable sub = null;
sub = set
.AsObservable()
.Subscribe(
x => {
try {
if (x.ChangeReason == ReactiveSetChangeReason.Add)
{
current = x.Items.Aggregate(current, addFunc);
}
else
{
current = x.Items.Aggregate(current, removeFunc);
}
observer.OnNext(current);
}
catch (Exception ex) {
observer.OnError(ex);
sub?.Dispose();
return;
}
},
observer.OnError,
observer.OnCompleted
);
return sub;
})
.DistinctUntilChanged());
}
public static IReactiveSet <T> Where <T>(this IReactiveSet <T> set, Func <T, bool> filter)
{
if (set == null)
{
throw new ArgumentNullException(nameof(set));
}
if (filter == null)
{
throw new ArgumentNullException(nameof(filter));
}
return(set
.AsObservable()
.Select(change => new ReactiveSetChange <T>(change.ChangeReason, change.Items.Where(filter)))
.ToReactiveSet(x => filter(x) && set.Contains(x)));
}
public static IReactiveSet <T> Intersection <T>(this IReactiveSet <T> first, IReactiveSet <T> second)
{
if (first == null)
{
throw new ArgumentNullException(nameof(first));
}
if (second == null)
{
throw new ArgumentNullException(nameof(second));
}
var obs1 = first.AsObservable().Select(change => new ReactiveSetChange <T>(change.ChangeReason, change.Items.Where(x => second.Contains(x))));
var obs2 = second.AsObservable().Select(change => new ReactiveSetChange <T>(change.ChangeReason, change.Items.Where(x => first.Contains(x))));
return(obs1.Merge(obs2).ToReactiveSet(x => first.Contains(x) && second.Contains(x)));
}
public static IOrderedReactiveSet <T> OrderBy <T, TCompare>(this IReactiveSet <T> set, Func <T, TCompare> compareFunc)
{
int comparison(T first, T second)
{
int comp = Comparer <TCompare> .Default.Compare(compareFunc(first), compareFunc(second));
if (comp != 0)
{
return(comp);
}
comp = Comparer <T> .Default.Compare(first, second);
if (comp != 0)
{
return(comp);
}
return(1);
}
return(new OrderedReactiveSet <T>(set.AsObservable(), Comparer <T> .Create(comparison)));
}
public static T FirstOrDefault <T>(this IReactiveSet <T> set)
{
return(set.AsObservable().Select(x => x.Items.FirstOrDefault()).FirstAsync().Wait());
}
public static T[] ToArray <T>(this IReactiveSet <T> set)
{
return(set.AsObservable().FirstAsync().Select(x => x.Items.ToArray()).Wait());
}
public static IObservable <IImmutableSet <T> > ToImmutableSets <T>(this IReactiveSet <T> set) => set.ToImmutableSets(() => ImmutableHashSet <T> .Empty);
public static ICollectedReactiveSet <T> Buffer <T>(this IReactiveSet <T> set, TimeSpan time)
{
if (set == null)
{
throw new ArgumentNullException(nameof(set));
}
var obs = Observable.Create <ReactiveSetChange <T> >(observer => {
var isFirst = true;
return(set.AsObservable()
.Where(x => {
if (isFirst)
{
isFirst = false;
observer.OnNext(x);
return false;
}
else
{
return true;
}
})
.Buffer(time)
.Subscribe(
x => {
var added = new HashSet <T>();
var removed = new HashSet <T>();
foreach (var change in x)
{
if (change.ChangeReason == ReactiveSetChangeReason.Add)
{
foreach (var item in change.Items)
{
if (removed.Contains(item))
{
removed.Remove(item);
}
else
{
added.Add(item);
}
}
}
else
{
foreach (var item in change.Items)
{
if (added.Contains(item))
{
added.Remove(item);
}
else
{
removed.Add(item);
}
}
}
}
if (added.Any())
{
observer.OnNext(new ReactiveSetChange <T>(ReactiveSetChangeReason.Add, added));
}
if (removed.Any())
{
observer.OnNext(new ReactiveSetChange <T>(ReactiveSetChangeReason.Remove, removed));
}
},
observer.OnError,
observer.OnCompleted
));
});
return(obs.ToReactiveSet());
}
public static IObservable <ImmutableSortedSet <T> > ToImmutableSortedSets <T>(this IReactiveSet <T> set)
{
return(set.Aggregate(ImmutableSortedSet <T> .Empty, (x, y) => x.Add(y), (x, y) => x.Remove(y)));
}
public static T FirstOrDefault <T>(this IReactiveSet <T> set, Func <T, bool> predicate)
{
return(set.AsObservable().Select(x => x.Items.FirstOrDefault(predicate)).FirstAsync().Wait());
}
