Method addAllImpl

corpus/java/training/guava/collect/Multisets.java:873–886

An implementation of Multiset#addAll.

(Multiset<E> self, Collection<? extends E> elements)

   * An implementation of {@link Multiset#addAll}.
   */
  static <E> boolean addAllImpl(Multiset<E> self, Collection<? extends E> elements) {
    if (elements.isEmpty()) {
      return false;
    }
    if (elements instanceof Multiset) {
      Multiset<? extends E> that = cast(elements);
      for (Entry<? extends E> entry : that.entrySet()) {
        self.add(entry.getElement(), entry.getCount());
      }
    } else {
      Iterators.addAll(self, elements.iterator());
    }
    return true;
  }

  /**
   * An implementation of {@link Multiset#removeAll}.