示例#1
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 @SuppressWarnings("unchecked")
 static <T, U> Tree<U> apply(
     Node<T> node, Function<? super T, ? extends Iterable<? extends U>> mapper) {
   final Tree<U> mapped = Tree.ofAll(mapper.apply(node.getValue()));
   if (mapped.isEmpty()) {
     return Tree.empty();
   } else {
     final List<Node<U>> children =
         (List<Node<U>>)
             (Object)
                 node.getChildren()
                     .map(child -> FlatMap.apply(child, mapper))
                     .filter(Tree::isDefined);
     return Tree.of(mapped.getValue(), children.prependAll(mapped.getChildren()));
   }
 }
示例#2
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 @Override
 default Tree<T> clear() {
   return Tree.empty();
 }
示例#3
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 /**
  * Returns a Tree containing {@code n} values supplied by a given Supplier {@code s}.
  *
  * @param <T> Component type of the Tree
  * @param n The number of elements in the Tree
  * @param s The Supplier computing element values
  * @return A Tree of size {@code n}, where each element contains the result supplied by {@code s}.
  * @throws NullPointerException if {@code s} is null
  */
 static <T> Tree<T> fill(int n, Supplier<? extends T> s) {
   Objects.requireNonNull(s, "s is null");
   return Collections.fill(n, s, Tree.empty(), Tree::of);
 }
示例#4
0
 /**
  * Returns a Tree containing {@code n} values of a given Function {@code f} over a range of
  * integer values from 0 to {@code n - 1}.
  *
  * @param <T> Component type of the Tree
  * @param n The number of elements in the Tree
  * @param f The Function computing element values
  * @return A Tree consisting of elements {@code f(0),f(1), ..., f(n - 1)}
  * @throws NullPointerException if {@code f} is null
  */
 static <T> Tree<T> tabulate(int n, Function<? super Integer, ? extends T> f) {
   Objects.requireNonNull(f, "f is null");
   return Collections.tabulate(n, f, Tree.empty(), Tree::of);
 }