public void noteMissing(String key){
  if (missingHyphenationTrees == null) {
    missingHyphenationTrees=new HashSet<>();
  }
  missingHyphenationTrees.add(key);
}

public void noteMissing ( String key ) { if ( missingHyphenationTrees == null ) { missingHyphenationTrees = new HashSet < > ( ) ; } missingHyphenationTrees . add ( key ) ; }
notes a key to a hyphenation tree as missing . this is to avoid searching a second time for a hyphenation pattern file which is not available .
