Package io.reactivex.rxjava3.core

Interface ObservableOperator<Downstream,Upstream>

Type Parameters:

Downstream - the value type of the downstream

Upstream - the value type of the upstream

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface ObservableOperator<@NonNull Downstream,@NonNull Upstream>

Interface to map/wrap a downstream Observer to an upstream Observer.

Method Summary

Modifier and Type	Method	Description
@NonNull Observer<? super Upstream>	apply(@NonNull Observer<? super @NonNull Downstream> observer)	Applies a function to the child Observer and returns a new parent Observer.

Method Detail

apply

@NonNull
@NonNull Observer<? super Upstream> apply(@NonNull
                                          @NonNull Observer<? super @NonNull Downstream> observer)
                                   throws java.lang.Throwable

Applies a function to the child Observer and returns a new parent Observer.

Parameters:

observer - the child Observer instance

Returns:

the parent Observer instance

Throws:

java.lang.Throwable - on failure