package reactor.core.publisher;
import java.util.Objects;
import java.util.function.BiConsumer;
import java.util.function.Supplier;
import org.reactivestreams.Subscription;
import reactor.core.CoreSubscriber;
import reactor.core.Fuseable;
import reactor.util.annotation.Nullable;
final class MonoCollect<T, R> extends MonoFromFluxOperator<T, R>
implements Fuseable {
final Supplier<R> supplier;
final BiConsumer<? super R, ? super T> action;
MonoCollect(Flux<? extends T> source,
Supplier<R> supplier,
BiConsumer<? super R, ? super T> action) {
super(source);
this.supplier = Objects.requireNonNull(supplier, "supplier");
this.action = Objects.requireNonNull(action);
}
@Override
public void subscribe(CoreSubscriber<? super R> actual) {
R container;
try {
container = Objects.requireNonNull(supplier.get(),
"The supplier returned a null container");
}
catch (Throwable e) {
Operators.error(actual, Operators.onOperatorError(e, actual.currentContext()));
return;
}
source.subscribe(new CollectSubscriber<>(actual, action, container));
}
static final class CollectSubscriber<T, R> extends Operators.MonoSubscriber<T, R> {
final BiConsumer<? super R, ? super T> action;
Subscription s;
boolean done;
CollectSubscriber(CoreSubscriber<? super R> actual,
BiConsumer<? super R, ? super T> action,
R container) {
super(actual);
this.action = action;
this.value = container;
}
@Override
@Nullable
public Object scanUnsafe(Attr key) {
if (key == Attr.TERMINATED) return done;
if (key == Attr.PARENT) return s;
return super.scanUnsafe(key);
}
@Override
public void cancel() {
super.cancel();
s.cancel();
}
@Override
public void onSubscribe(Subscription s) {
if (Operators.validate(this.s, s)) {
this.s = s;
actual.onSubscribe(this);
s.request(Long.MAX_VALUE);
}
}
@Override
public void onNext(T t) {
if (done) {
Operators.onNextDropped(t, actual.currentContext());
return;
}
try {
action.accept(value, t);
}
catch (Throwable e) {
onError(Operators.onOperatorError(this, e, t, actual.currentContext()));
}
}
@Override
public void onError(Throwable t) {
if (done) {
Operators.onErrorDropped(t, actual.currentContext());
return;
}
done = true;
actual.onError(t);
}
@Override
public void onComplete() {
if (done) {
return;
}
done = true;
complete(value);
}
@Override
public void setValue(R value) {
}
}
}