Extractor (Flink : Streaming Java 2.2.0 API)

Type Parameters:

FROM - The input data type.

TO - The output data type.

All Superinterfaces:

Serializable

All Known Implementing Classes:

ArrayFromTuple, ConcatenatedExtract, FieldFromArray, FieldFromTuple, FieldsFromArray, FieldsFromTuple
```
@Internal
public interface Extractor<FROM,TO>
extends Serializable
```
Extractors allow to extract/convert one type to another. They are mostly used to extract some fields out of a more complex structure (Tuple/Array) to run further calculation on the extraction result.

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  TO extract(FROM in)
  Extracts/Converts the given input to an object of the output type.

- Method Detail
  - extract
```
TO extract(FROM in)
```
    Extracts/Converts the given input to an object of the output type.
    
    Parameters:
    
    in - the input data
    
    Returns:
    
    the extracted/converted data