Module com.remondis.remap
Package com.remondis.remap.utils.mapOver

Class MapOver<R,​T>

  • Type Parameters:
    T - The root bean type
    public class MapOver<R,​T>
extends Object

    A util class that supports mapping of objects of the same type while only specified properties are taken from source and will be overridden in the target object. This makes it easier to use attached JPA entities and only map over changes made in the source object. Handling attached entities with RE-Map is a little bit tricky when it comes to update operations, since RE-Map always creates a new object and the map-into method in the mapper does not perform a real recursive map-into.

    Using the MapOver utility makes it possible to apply the following update strategy on attached entities: 

     REST -->  DTO  -->  RE-Map  --> new Entity instance     (detached)
                                                             *
                                                             |
                                                         Map-over selected attributes
                                                         to perform a partial update
                                                         on the attached entity+
                                                             |
                                                             |
                                                             V
 JPA-Repository --> findById --> Entity instance from DB (attached)  --> em.update(entity);