public String toString() {
    return String.format(
      "IdeaContentRoot{rootDirectory=%s, sourceDirectories count=%d, testDirectories count=%d, resourceDirectories count=%d, testResourceDirectories count=%d, excludeDirectories count=%d}",
      this.rootDirectory, this.sourceDirectories.size(), this.testDirectories.size(),
      this.resourceDirectories.size(), this.testResourceDirectories.size(), this.excludeDirectories.size());
  }
public String toString()