Method castOrCopyToCollection

output/java_guava/1.4.18/Iterables.java:364–368

Converts an iterable into a collection. If the iterable is already a collection, it is returned. Otherwise, an java.util.ArrayList is created with the contents of the iterable in the same iteration order.

(Iterable<E> iterable)

   */

  private static <E> Collection<E> castOrCopyToCollection(Iterable<E> iterable) {
    return (iterable instanceof Collection)
      ? (Collection<E>) iterable
      : Lists.newArrayList(iterable.iterator());
  }

  /**
   * Adds all elements in {@code iterable} to {@code collection}.