public static Mapper concat(final Mapper first, final Mapper second){
        return new ConcatMapper(new Mapper[]{first,second});
    }
public static Mapper concat ( final Mapper first , final Mapper second ) { return new ConcatMapper ( new Mapper [ ] { first , second } ) ; }
Concatenate two Mappers.
@param first first mapper to apply
@param second second mapper to apply
@return mapper