MigrationHandler (Component API)

```
public interface MigrationHandler
```
Migrate a tcomp data instance from one version to another one. This uses a flat format to make any conversion very easy and an "untyped" structure to avoid
- to require the type to be passed through the layers
- to require to instantiate unknown objects
This is linked to a component through Version to ensure cross inputs can be handled.

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  Map<String,String> migrate(int incomingVersion, Map<String,String> incomingData)

- Method Detail
  - migrate
```
Map<String,String> migrate(int incomingVersion,
                                 Map<String,String> incomingData)
```
    Parameters:
    
    incomingVersion - the version of associatedData values.
    
    incomingData - the data sent from the caller. Keys are using the path of the property as in component metadata.
    
    Returns:
    
    the set of properties for the current version.