private void addGroupToIndexes(final FileGroup fromGroup) {
    myGroupHolder.put(fromGroup.getId(), fromGroup);

    for (String file : fromGroup.getFiles()) {
      myFileIdx.put(file, fromGroup);
    }

    for (FileGroup fromChild : fromGroup.getChildren()) {
      addGroupToIndexes(fromChild);
    }
  }
private void addGroupToIndexes(final FileGroup fromGroup)