| // Boost.Geometry Index |
| // |
| // R-tree levels validating visitor implementation |
| // |
| // Copyright (c) 2011-2013 Adam Wulkiewicz, Lodz, Poland. |
| // |
| // Use, modification and distribution is subject to the Boost Software License, |
| // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
| // http://www.boost.org/LICENSE_1_0.txt) |
| |
| #ifndef BOOST_GEOMETRY_INDEX_DETAIL_RTREE_UTILITIES_ARE_LEVELS_OK_HPP |
| #define BOOST_GEOMETRY_INDEX_DETAIL_RTREE_UTILITIES_ARE_LEVELS_OK_HPP |
| |
| #include <boost/geometry/index/detail/rtree/node/node.hpp> |
| |
| namespace boost { namespace geometry { namespace index { namespace detail { namespace rtree { namespace utilities { |
| |
| namespace visitors { |
| |
| template <typename Value, typename Options, typename Box, typename Allocators> |
| class are_levels_ok |
| : public rtree::visitor<Value, typename Options::parameters_type, Box, Allocators, typename Options::node_tag, true>::type |
| { |
| typedef typename rtree::internal_node<Value, typename Options::parameters_type, Box, Allocators, typename Options::node_tag>::type internal_node; |
| typedef typename rtree::leaf<Value, typename Options::parameters_type, Box, Allocators, typename Options::node_tag>::type leaf; |
| |
| public: |
| inline are_levels_ok() |
| : result(true), m_leafs_level((std::numeric_limits<size_t>::max)()), m_current_level(0) |
| {} |
| |
| inline void operator()(internal_node const& n) |
| { |
| typedef typename rtree::elements_type<internal_node>::type elements_type; |
| elements_type const& elements = rtree::elements(n); |
| |
| if (elements.empty()) |
| { |
| result = false; |
| return; |
| } |
| |
| size_t current_level_backup = m_current_level; |
| ++m_current_level; |
| |
| for ( typename elements_type::const_iterator it = elements.begin(); |
| it != elements.end() ; ++it) |
| { |
| rtree::apply_visitor(*this, *it->second); |
| |
| if ( result == false ) |
| return; |
| } |
| |
| m_current_level = current_level_backup; |
| } |
| |
| inline void operator()(leaf const& n) |
| { |
| typedef typename rtree::elements_type<leaf>::type elements_type; |
| elements_type const& elements = rtree::elements(n); |
| |
| // empty leaf in non-root node |
| if (0 < m_current_level && elements.empty()) |
| { |
| result = false; |
| return; |
| } |
| |
| if ( m_leafs_level == (std::numeric_limits<size_t>::max)() ) |
| { |
| m_leafs_level = m_current_level; |
| } |
| else if ( m_leafs_level != m_current_level ) |
| { |
| result = false; |
| } |
| } |
| |
| bool result; |
| |
| private: |
| size_t m_leafs_level; |
| size_t m_current_level; |
| }; |
| |
| } // namespace visitors |
| |
| template <typename Rtree> inline |
| bool are_levels_ok(Rtree const& tree) |
| { |
| typedef utilities::view<Rtree> RTV; |
| RTV rtv(tree); |
| |
| visitors::are_levels_ok< |
| typename RTV::value_type, |
| typename RTV::options_type, |
| typename RTV::box_type, |
| typename RTV::allocators_type |
| > v; |
| |
| rtv.apply_visitor(v); |
| |
| return v.result; |
| } |
| |
| }}}}}} // namespace boost::geometry::index::detail::rtree::utilities |
| |
| #endif // BOOST_GEOMETRY_INDEX_DETAIL_RTREE_UTILITIES_ARE_LEVELS_OK_HPP |