code: public Object getObjectWithId( IdKey id ) {
          if ( null != idToObject ) {
              return idToObject.get( id );
          }
          return null;
      }
docs: <p>getObjectWithId</p>
  
  @param id a {@link com.fasterxml.jackson.annotation.ObjectIdGenerator.IdKey} object.
  
  @return a {@link java.lang.Object} object.