public IObservable <IChangeSet <TDestination> > Run()
{
if (_childChanges != null)
{
return(CreateWithChangeset());
}
return(Observable.Create <IChangeSet <TDestination> >(observer =>
{
//NB: ChangeAwareList is used internally by dd to capture changes to a list and ensure they can be replayed by subsequent operators
var result = new ChangeAwareList <TDestination>();
return _source.Transform(item => new ManyContainer(_manyselector(item).ToArray()), true)
.Select(changes =>
{
var destinationChanges = new DestinationEnumerator(changes, _equalityComparer);
result.Clone(destinationChanges, _equalityComparer);
return result.CaptureChanges();
})
.NotEmpty()
.SubscribeSafe(observer);
}
));
}
public IObservable <IChangeSet <TDestination> > Run()
{
return(_source.Transform(item =>
{
//create a container which is used to store state of an item together with it's children
var many = _manyselector(item).ToArray();
return new ManyContainer(item, many);
})
.Select(changes =>
{
var items = new DestinationEnumerator(changes, _equalityComparer);
return new ChangeSet <TDestination>(items);
}).NotEmpty());
}
public IObservable <IChangeSet <TDestination, TDestinationKey> > Run()
{
return(_source.Transform((source, key) =>
{
var many = _manyselector(source)
.Select(m => new DestinationContainer(m, _keySelector(m)))
.ToArray();
return new ManyContainer(source, key, many);
})
.Select(changes =>
{
var items = new DestinationEnumerator(changes);
return new ChangeSet <TDestination, TDestinationKey>(items);
}));
}
