Method instancesOf

java/dagger/internal/codegen/DaggerStreams.java:75–77

Returns a function from Object to Stream , which returns a stream containing its input if its input is an instance of T. Use as an argument to Stream#flatMap(Function): Stream barStream = fooStream.flatMap(instancesOf(Bar.class));

(Class<T> to)

   * <pre>{@code Stream<Bar>} barStream = fooStream.flatMap(instancesOf(Bar.class));</pre>
   */
  public static <T> Function<Object, Stream<T>> instancesOf(Class<T> to) {
    return f -> to.isInstance(f) ? Stream.of(to.cast(f)) : Stream.empty();
  }

  private DaggerStreams() {}
}