Index.h

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/******************************************************************************
 * Project:  libspatialindex - A C++ library for spatial indexing
 * Author:   Marios Hadjieleftheriou, [email protected]
 ******************************************************************************
 * Copyright (c) 2002, Marios Hadjieleftheriou
 *
 * All rights reserved.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
******************************************************************************/
 
#pragma once
 
namespace SpatialIndex
{
        namespace RTree
        {
                class Index : public Node
                {
                public:
                        virtual ~Index();
 
                protected:
                        Index(RTree* pTree, id_type id, uint32_t level);
 
                        virtual NodePtr chooseSubtree(const Region& mbr, uint32_t level, std::stack<id_type>& pathBuffer);
                        virtual NodePtr findLeaf(const Region& mbr, id_type id, std::stack<id_type>& pathBuffer);
 
                        virtual void split(uint32_t dataLength, byte* pData, Region& mbr, id_type id, NodePtr& left, NodePtr& right);
 
                        uint32_t findLeastEnlargement(const Region&) const;
                        uint32_t findLeastOverlap(const Region&) const;
 
                        void adjustTree(Node*, std::stack<id_type>&);
                        void adjustTree(Node*, Node*, std::stack<id_type>&, byte* overflowTable);
 
                        class OverlapEntry
                        {
                        public:
                                uint32_t m_index;
                                double m_enlargement;
                                RegionPtr m_original;
                                RegionPtr m_combined;
                                double m_oa;
                                double m_ca;
 
                                static int compareEntries(const void* pv1, const void* pv2)
                                {
                                        OverlapEntry* pe1 = * (OverlapEntry**) pv1;
                                        OverlapEntry* pe2 = * (OverlapEntry**) pv2;
 
                                        if (pe1->m_enlargement < pe2->m_enlargement) return -1;
                                        if (pe1->m_enlargement > pe2->m_enlargement) return 1;
                                        return 0;
                                }
                        }; // OverlapEntry
 
                        friend class RTree;
                        friend class Node;
                        friend class BulkLoader;
                }; // Index
        }
}