Streamer (aksw-commons-index 0.9.2 API)

Type Parameters:

V - The type of the store from which to stream items

T - The item type to stream

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 Streamer<V,T>
```
A streamer returns a stream of items from a collection-like object (referred to as a 'store') given as the argument. For example, in the case of a map data structure a streamer may return any of its key, value or entry set. If the actual type of the collection is not known the {streamRaw(Object) method should be used.

Author:

Claus Stadler 11/09/2020

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`default <U> Streamer<V,U>`	`mapItems(java.util.function.Function<T,U> itemTransform)`	Convenience method to derive a new streamer that transforms the items emitted by the original streamer.
`default <U> Streamer<V,U>`	`mapStream(StreamTransform<T,U> streamTransform)`	Convenience method that yields a new Streamer that wraps this streamer such that its streams are transformed by the given streamTransform.
`java.util.stream.Stream<T>`	`stream(V store)`
`default java.util.stream.Stream<T>`	`streamRaw(Object store)`	Delegate to `stream(Object)`.

- Method Detail
  - stream
```
java.util.stream.Stream<T> stream(V store)
```
  - mapStream
```
default <U> Streamer<V,U> mapStream(StreamTransform<T,U> streamTransform)
```
    Convenience method that yields a new Streamer that wraps this streamer such that its streams are transformed by the given streamTransform.
    
    Type Parameters:
    
    U -
    
    Parameters:
    
    streamTransform -
    
    Returns:
  - mapItems
```
default <U> Streamer<V,U> mapItems(java.util.function.Function<T,U> itemTransform)
```
    Convenience method to derive a new streamer that transforms the items emitted by the original streamer.
    
    Type Parameters:
    
    U -
    
    Parameters:
    
    itemTransform -
    
    Returns:
  - streamRaw
```
default java.util.stream.Stream<T> streamRaw(Object store)
```
    Delegate to stream(Object).
    
    Parameters:
    
    store -
    
    Returns:
    
    A stream from given store. Arguments of incorrect type will cause a ClassCastException.