org.javers.core.diff.custom

Interface CustomPropertyComparator<T,C extends PropertyChange>

Type Parameters:

T - custom type, e.g. Multimap

C - concrete type of PropertyChange returned by a comparator

All Known Implementing Classes:

CustomBigDecimalComparator

public interface CustomPropertyComparator<T,C extends PropertyChange>

Custom property-scope comparator.

Implementation should calculate a diff between two Value types.

For example, if you are using Multimap from Guava, implement:

  public class GuavaCustomComparator implements CustomPropertyComparator<Multimap, MapChange> {
     public MapChange compare(Multimap left, Multimap right, GlobalId affectedId, Property property) {
       ... // omitted
     }
   }
 

and register a custom comparator in JaversBuilder:

 JaversBuilder.javers()
     .registerCustomComparator(new GuavaCustomComparator(), Multimap.class).build()
 

Method Summary

Modifier and Type	Method and Description
C	compare(T left, T right, GlobalId affectedId, Property property)

Method Detail

compare

C compare(T left,
          T right,
          GlobalId affectedId,
          Property property)

Parameters:

left - left (or old) property value

right - right (or current) property value

affectedId - Id of domain object being compared

property - property being compared

Returns:

should return null if compared objects have no differences