public Set<String> getFilteringExcludedExtensions() {
    if (filteringExclusions.isEmpty()) {
      return MavenProjectConfiguration.DEFAULT_FILTERING_EXCLUDED_EXTENSIONS;
    }
    final Set<String> result = CollectionFactory.createFilePathSet();
    result.addAll(MavenProjectConfiguration.DEFAULT_FILTERING_EXCLUDED_EXTENSIONS);
    result.addAll(filteringExclusions);
    return Collections.unmodifiableSet(result);
  }
public Set<String> getFilteringExcludedExtensions()