public Tagset filterPrefix(String prefix, boolean positive, boolean removePrefix) {
if (prefix == null) {
throw new IllegalArgumentException("prefix == null");
}
Tagset set = new Tagset();
for (Tag tag : this) {
if (tag.normalizedValue().startsWith(prefix) == positive) {
if (positive && removePrefix) {
String str = tag.normalizedValue().substring(prefix.length());
if (str.length() != 0) set.add(str);
} else {
set.add(tag);
}
}
}
return set;
}
public int compare(Tag a, Tag b) {
return a.normalizedValue().compareTo(b.normalizedValue());
}