public boolean hasBooksForPattern(String pattern) {
if (pattern == null || pattern.length() == 0) {
return false;
}
pattern = pattern.toLowerCase();
for (Book b : books()) {
if (b.matches(pattern)) {
return true;
}
}
return false;
}
public List<Book> booksForPattern(String pattern) {
if (pattern == null || pattern.length() == 0) {
return Collections.emptyList();
}
pattern = pattern.toLowerCase();
final LinkedList<Book> filtered = new LinkedList<Book>();
for (Book b : books()) {
if (b.matches(pattern)) {
filtered.add(b);
}
}
return filtered;
}