Method add

output/java_guava/1.4.18/TreeMultiset.java:256–276

(@Nullable E element, int occurrences)

  }

  @CanIgnoreReturnValue
  @Override
  public int add(@Nullable E element, int occurrences) {
    checkNonnegative(occurrences, "occurrences");
    if (occurrences == 0) {
      return count(element);
    }
    checkArgument(range.contains(element));
    AvlNode<E> root = rootReference.get();
    if (root == null) {
      comparator().compare(element, element);
      AvlNode<E> newRoot = new AvlNode<E>(element, occurrences);
      successor(header, newRoot, header);
      rootReference.checkAndSet(root, newRoot);
      return 0;
    }
    int[] result = new int[1]; // used as a mutable int reference to hold result
    AvlNode<E> newRoot = root.add(comparator(), element, occurrences, result);
    rootReference.checkAndSet(root, newRoot);
    return result[0];
  }

  @CanIgnoreReturnValue
  @Override