Method copyOf

src/main/java/net/starlark/java/eval/Dict.java:456–492

Returns a new dict with the specified mutability containing the entries of m.

(@Nullable Mutability mu, Map<? extends K, ? extends V> m)

  /** Returns a new dict with the specified mutability containing the entries of {@code m}. */
  public static <K, V> Dict<K, V> copyOf(@Nullable Mutability mu, Map<? extends K, ? extends V> m) {
    if (mu == null) {
      mu = Mutability.IMMUTABLE;
    }

    if (mu == Mutability.IMMUTABLE) {
      if (m.isEmpty()) {
        return empty();
      }

      if (m instanceof ImmutableMap) {
        m.forEach(
            (k, v) -> {
              Starlark.checkValid(k);
              Starlark.checkValid(v);
            });
        @SuppressWarnings("unchecked")
        ImmutableMap<K, V> immutableMap = (ImmutableMap<K, V>) m;
        return new Dict<>(immutableMap);
      }

      if (m instanceof Dict && ((Dict<?, ?>) m).isImmutable()) {
        @SuppressWarnings("unchecked")
        Dict<K, V> dict = (Dict<K, V>) m;
        return dict;
      }

      ImmutableMap.Builder<K, V> immutableMapBuilder =
          ImmutableMap.builderWithExpectedSize(m.size());
      m.forEach((k, v) -> immutableMapBuilder.put(Starlark.checkValid(k), Starlark.checkValid(v)));
      return new Dict<>(immutableMapBuilder.buildOrThrow());
    } else {
      LinkedHashMap<K, V> linkedHashMap = Maps.newLinkedHashMapWithExpectedSize(m.size());
      m.forEach((k, v) -> linkedHashMap.put(Starlark.checkValid(k), Starlark.checkValid(v)));
      return new Dict<>(mu, linkedHashMap);
    }
  }

  /** Returns an immutable dict containing the entries of {@code m}. */
  public static <K, V> Dict<K, V> immutableCopyOf(Map<? extends K, ? extends V> m) {