code: public final String getInterfacesCommaSeparated() {
          final StringBuffer sb = new StringBuffer();
          if (interfaces.size() > 0) {
              for (int i = 0; i < interfaces.size(); i++) {
                  if (i > 0) {
                      sb.append(", ");
                  }
                  sb.append(interfaces.get(i).getSourceName());
              }
          }
          return sb.toString();
      }
docs: Returns all (fully qualified) interface names.
  
  @return Names separated by a comma - Always non-null.