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> 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)));
}