Extractor (MapStruct 1.6.3)

Type Parameters:

T - the type of the input to the function

R - the type of the result of the function
```
public interface Extractor<T,R>
```
This is a helper interface until we migrate to Java 8. It allows us to abstract our code easier.

Author:

Filip Hrisafov

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  R apply(T t)
  Extract a value from the passed parameter.

- Method Detail
  - apply
```
R apply(T t)
```
    Extract a value from the passed parameter.
    
    Parameters:
    
    t - the value that we need to extract from
    
    Returns:
    
    the result from the extraction