/** * Factory method to create a transforming navigable set. * <p> * If there are any elements already in the set being decorated, they * are NOT transformed. * Contrast this with {@link #transformedNavigableSet(NavigableSet, Transformer)}. * * @param <E> the element type * @param set the set to decorate, must not be null * @param transformer the transformer to use for conversion, must not be null * @return a new transformed {@link NavigableSet} * @throws NullPointerException if set or transformer is null */ public static <E> TransformedNavigableSet<E> transformingNavigableSet(final NavigableSet<E> set, final Transformer<? super E, ? extends E> transformer) { return new TransformedNavigableSet<>(set, transformer); }
/** * Factory method to create a transforming navigable set that will transform * existing contents of the specified navigable set. * <p> * If there are any elements already in the set being decorated, they * will be transformed by this method. * Contrast this with {@link #transformingNavigableSet(NavigableSet, Transformer)}. * * @param <E> the element type * @param set the set to decorate, must not be null * @param transformer the transformer to use for conversion, must not be null * @return a new transformed {@link NavigableSet} * @throws NullPointerException if set or transformer is null */ public static <E> TransformedNavigableSet<E> transformedNavigableSet(final NavigableSet<E> set, final Transformer<? super E, ? extends E> transformer) { final TransformedNavigableSet<E> decorated = new TransformedNavigableSet<>(set, transformer); if (set.size() > 0) { @SuppressWarnings("unchecked") // set is type E final E[] values = (E[]) set.toArray(); // NOPMD - false positive for generics set.clear(); for (final E value : values) { decorated.decorated().add(transformer.transform(value)); } } return decorated; }