public List<Book> booksForTitlePrefix(String prefix) {
final LinkedList<Book> filtered = new LinkedList<Book>();
for (Book b : books()) {
if (prefix.equals(TitleUtil.firstTitleLetter(b))) {
filtered.add(b);
}
}
return filtered;
}
public List<String> titlesForTitlePrefix(String prefix, int limit) {
if (limit <= 0) {
return Collections.emptyList();
}
final ArrayList<String> titles = new ArrayList<String>(limit);
synchronized (myBooksByFile) {
for (Book b : myBooksByFile.values()) {
if (prefix.equals(TitleUtil.firstTitleLetter(b))) {
titles.add(b.getTitle());
if (--limit == 0) {
break;
}
}
}
}
return titles;
}