code: public void setDirectoryNames(java.util.Collection<String> directoryNames) {
          if (directoryNames == null) {
              this.directoryNames = null;
              return;
          }
  
          this.directoryNames = new java.util.ArrayList<String>(directoryNames);
      }
docs: <p>
  The directory names.
  </p>
  
  @param directoryNames
  The directory names.