@Override public final boolean hasSource(String sourceId) throws AdeException {
  refreshDictionaryIfNeeded();
  return m_dictionary.getWordId(sourceId) != DbDictionary.InvalidID;
}

@ Override public final boolean hasSource ( String sourceId ) throws AdeException { refreshDictionaryIfNeeded ( ) ; return m_dictionary . getWordId ( sourceId ) != DbDictionary . InvalidID ; }
this method determines whether or not the input sourceid is associated with a source
