Method retainAllImpl

output/java_guava/1.4.17/Multisets.java:927–934

An implementation of Multiset#retainAll.

(Multiset<?> self, Collection<?> elementsToRetain)

   */

  static boolean retainAllImpl(Multiset<?> self, Collection<?> elementsToRetain) {
    checkNotNull(elementsToRetain);
    Collection<?> collection =
      (elementsToRetain instanceof Multiset)
        ? ((Multiset<?>) elementsToRetain).elementSet()
        : elementsToRetain;
    return self.elementSet().retainAll(collection);
  }

  /**
   * An implementation of {@link Multiset#setCount(Object, int)}.