Method keySet

src/java/org/apache/poi/util/BinaryTree.java:1531–1573

Returns a set view of the keys contained in this map. The set is backed by the map, so changes to the map are reflected in the set, and vice-versa. If the map is modified while an iteration over the set is in progress, the results of the iteration are undefined. The set supports element removal, wh

()

     * @return a set view of the keys contained in this map.
     */
    public Set keySet()
    {
        if (_key_set[ _KEY ] == null)
        {
            _key_set[ _KEY ] = new AbstractSet()
            {
                public Iterator iterator()
                {
                    return new BinaryTreeIterator(_KEY)
                    {
                        protected Object doGetNext()
                        {
                            return _last_returned_node.getData(_KEY);
                        }
                    };
                }

                public int size()
                {
                    return BinaryTree.this.size();
                }

                public boolean contains(Object o)
                {
                    return containsKey(o);
                }

                public boolean remove(Object o)
                {
                    int old_size = _size;

                    BinaryTree.this.remove(o);
                    return _size != old_size;
                }

                public void clear()
                {
                    BinaryTree.this.clear();
                }
            };
        }
        return _key_set[ _KEY ];
    }

    /**
     * Returns a collection view of the values contained in this