@Override
  public boolean containsAll(Collection collection) {
    for (final Object o : collection) {
      if (!contains(o)) {
        return false;
      }
    }
    return true;
  }
Determine if all of the elements in <tt>collection</tt> are present.

@param collection a <code>Collection</code> value
@return true if all elements are present.
geode-core/src/main/java/org/apache/geode/cache/query/internal/index/HashIndexSet.java