Implement new JDK21 SortedSet and List methods for SortedList

aQute.libg/src/aQute/lib/collections/SortedList.java

@@ -358,13 +358,21 @@ public T first() {
 		return get(0);
 	}
 
+	public T getFirst() {
+		return first();
+	}
+
 	@Override
 	public T last() {
 		if (isEmpty())
 			throw new NoSuchElementException("last");
 		return get(size() - 1);
 	}
 
+	public T getLast() {
+		return last();
+	}
+
 	@Override
 	@Deprecated
 	public boolean addAll(int index, Collection<? extends T> c) {
@@ -392,12 +400,32 @@ public void add(int index, T element) {
 		throw new UnsupportedOperationException("Immutable");
 	}
 
+	@Deprecated
+	public void addFirst(T e) {
+		throw new UnsupportedOperationException("Immutable");
+	}
+
+	@Deprecated
+	public void addLast(T e) {
+		throw new UnsupportedOperationException("Immutable");
+	}
+
 	@Override
 	@Deprecated
 	public T remove(int index) {
 		throw new UnsupportedOperationException("Immutable");
 	}
 
+	@Deprecated
+	public T removeFirst() {
+		throw new UnsupportedOperationException("Immutable");
+	}
+
+	@Deprecated
+	public T removeLast() {
+		throw new UnsupportedOperationException("Immutable");
+	}
+
 	@Override
 	public ListIterator<T> listIterator() {
 		return new It(start);
@@ -506,6 +534,13 @@ public static <T> SortedSet<T> empty() {
 		return (SortedSet<T>) EMPTY;
 	}
 
+	public SortedList<T> reversed() {
+		if (comparator == null) {
+			return new SortedList<>(list, start, end, (Comparator<? super T>) Comparator.reverseOrder());
+		}
+		return new SortedList<>(list, start, end, comparator.reversed());
+	}
+
 	@Override
 	public Spliterator<T> spliterator() {
 		return SortedSet.super.spliterator();

aQute.libg/src/aQute/lib/collections/package-info.java

@@ -1,4 +1,4 @@
-@Version("4.2.0")
+@Version("4.3.0")
 package aQute.lib.collections;
 
 import org.osgi.annotation.versioning.Version;