ObservableTransformer (RxJava Javadoc 2.2.21)

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Type Parameters:

Upstream - the upstream value type

Downstream - the downstream value type
```
public interface ObservableTransformer<Upstream,Downstream>
```
Interface to compose Observables.

Method Summary

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Modifier and Type	Method and Description
`ObservableSource<Downstream>`	`apply(Observable<Upstream> upstream)` Applies a function to the upstream Observable and returns an ObservableSource with optionally different element type.

- Method Detail
  - apply
```
@NonNull
ObservableSource<Downstream> apply(@NonNull
                                            Observable<Upstream> upstream)
```
    Applies a function to the upstream Observable and returns an ObservableSource with optionally different element type.
    
    Parameters:
    
    upstream - the upstream Observable instance
    
    Returns:
    
    the transformed ObservableSource instance

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