code: public void addAllSubsystemFileSources(ZipFileSubsystemInputStreamSources other) {
          for (Map.Entry<String, ZipEntryInputStreamSource> entry : other.inputStreamSourceMap.entrySet()) {
              if (!this.inputStreamSourceMap.containsKey(entry.getKey())) {
                  this.inputStreamSourceMap.put(entry.getKey(), entry.getValue());
              }
          }
      }
docs: Adds all subsystem input stream sources from the specified factory. Note that only absent sources will be added.
  @param other