private void initHyperlinkSet() {
if (myVisitedHyperlinks == null) {
myVisitedHyperlinks = new TreeSet<String>();
if (myId != -1) {
myVisitedHyperlinks.addAll(BooksDatabase.Instance().loadVisitedHyperlinks(myId));
}
}
}
public List<Author> authors() {
final Set<Author> authors = new TreeSet<Author>();
synchronized (myBooksByFile) {
for (Book book : myBooksByFile.values()) {
final List<Author> bookAuthors = book.authors();
if (bookAuthors.isEmpty()) {
authors.add(Author.NULL);
} else {
authors.addAll(bookAuthors);
}
}
}
return new ArrayList<Author>(authors);
}