public AttributeSet[] getTreeChildren() {
int attrAmount = attributes.size();
if (attrAmount <= 1) {
return new AttributeSet[0];
}
final AttributeSet[] children = new AttributeSet[attrAmount];
Iterator<Attribute> it = attributes.iterator();
Attribute attr = it.next();
for (int i = 0; ; ++i) {
SortedSet<Attribute> childAttr = attributes.headSet(attr);
if (it.hasNext()) {
attr = it.next();
childAttr = new TreeSet<>(childAttr);
childAttr.addAll(attributes.tailSet(attr));
children[i] = AttributeSet.getSet(childAttr);
} else {
children[i] = AttributeSet.getSet(childAttr);
return children;
}
}
}
public AttributeSet merge(final AttributeSet other) {
SortedSet<Attribute> newSet = new TreeSet<>(attributes);
newSet.addAll(other.attributes);
return AttributeSet.getSet(newSet);
}
public static AttributeSet getSet(final Attribute attribute) {
SortedSet<Attribute> set = new TreeSet<>();
set.add(attribute);
return AttributeSet.getSet(set);
}