code: public <C> DbxDeltaC<C> getDeltaCWithPathPrefix(Collector<DbxDeltaC.Entry<DbxEntry>, C> collector,
                                                      /*@Nullable*/String cursor, String pathPrefix,
                                                      boolean includeMediaInfo)
          throws DbxException
      {
          DbxPathV1.checkArg("path", pathPrefix);
          return _getDeltaC(collector, cursor, pathPrefix, includeMediaInfo);
      }
docs: A more generic version of {@link #getDeltaWithPathPrefix}.  You provide a <em>collector</em>,
  which lets you process the delta entries as they arrive over the network.