tprtree/Leaf.cc

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/******************************************************************************
 * Project:  libspatialindex - A C++ library for spatial indexing
 * Author:   Marios Hadjieleftheriou, mhadji@gmail.com
 ******************************************************************************
 * 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.
******************************************************************************/
 
#include <cstring>
 
#include <spatialindex/SpatialIndex.h>
 
#include "TPRTree.h"
#include "Node.h"
#include "Index.h"
#include "Leaf.h"
 
using namespace SpatialIndex;
using namespace SpatialIndex::TPRTree;
 
Leaf::~Leaf()
= default;
 
Leaf::Leaf(SpatialIndex::TPRTree::TPRTree* pTree, id_type id)
    : Node(pTree, id, 0, pTree->m_leafCapacity)
{
}
 
NodePtr Leaf::chooseSubtree(const MovingRegion&, uint32_t, std::stack<id_type>&)
{
    // should make sure to relinquish other PoolPointer lists that might be pointing to the
    // same leaf.
    return NodePtr(this, &(m_pTree->m_leafPool));
}
 
NodePtr Leaf::findLeaf(const MovingRegion&, id_type id, std::stack<id_type>&)
{
    for (uint32_t cChild = 0; cChild < m_children; ++cChild)
    {
        // should make sure to relinquish other PoolPointer lists that might be pointing to the
        // same leaf.
        if (m_pIdentifier[cChild] == id /*&& mbr == *(m_ptrMBR[cChild])*/) return NodePtr(this, &(m_pTree->m_leafPool));
    }
 
    return NodePtr();
}
 
void Leaf::split(uint32_t dataLength, uint8_t* pData, MovingRegion& mbr, id_type id, NodePtr& pLeft, NodePtr& pRight)
{
    ++(m_pTree->m_stats.m_splits);
 
    std::vector<uint32_t> g1, g2;
 
    switch (m_pTree->m_treeVariant)
    {
        case TPRV_RSTAR:
            rstarSplit(dataLength, pData, mbr, id, g1, g2);
            break;
        default:
            throw Tools::NotSupportedException("Leaf::split: Tree variant not supported.");
    }
 
    pLeft = m_pTree->m_leafPool.acquire();
    pRight = m_pTree->m_leafPool.acquire();
 
    if (pLeft.get() == nullptr) pLeft = NodePtr(new Leaf(m_pTree, -1), &(m_pTree->m_leafPool));
    if (pRight.get() == nullptr) pRight = NodePtr(new Leaf(m_pTree, -1), &(m_pTree->m_leafPool));
 
    pLeft->m_nodeMBR = m_pTree->m_infiniteRegion;
    pRight->m_nodeMBR = m_pTree->m_infiniteRegion;
 
    uint32_t cIndex;
 
    for (cIndex = 0; cIndex < g1.size(); ++cIndex)
    {
        pLeft->insertEntry(m_pDataLength[g1[cIndex]], m_pData[g1[cIndex]], *(m_ptrMBR[g1[cIndex]]), m_pIdentifier[g1[cIndex]]);
        // we don't want to delete the data array from this node's destructor!
        m_pData[g1[cIndex]] = nullptr;
    }
 
    for (cIndex = 0; cIndex < g2.size(); ++cIndex)
    {
        pRight->insertEntry(m_pDataLength[g2[cIndex]], m_pData[g2[cIndex]], *(m_ptrMBR[g2[cIndex]]), m_pIdentifier[g2[cIndex]]);
        // we don't want to delete the data array from this node's destructor!
        m_pData[g2[cIndex]] = nullptr;
    }
}
 
void Leaf::deleteData(id_type id, std::stack<id_type>& pathBuffer)
{
    uint32_t child;
 
    for (child = 0; child < m_children; ++child)
    {
        if (m_pIdentifier[child] == id) break;
    }
 
    deleteEntry(child);
    m_pTree->writeNode(this);
 
    std::stack<NodePtr> toReinsert;
    NodePtr ptrThis(this, &(m_pTree->m_leafPool));
    condenseTree(toReinsert, pathBuffer, ptrThis);
    ptrThis.relinquish();
 
    // re-insert eliminated nodes.
    while (! toReinsert.empty())
    {
        NodePtr n = toReinsert.top(); toReinsert.pop();
        m_pTree->deleteNode(n.get());
 
        for (uint32_t cChild = 0; cChild < n->m_children; ++cChild)
        {
            // keep this in the for loop. The tree height might change after insertions.
            uint8_t* overflowTable = new uint8_t[m_pTree->m_stats.m_treeHeight];
            memset(overflowTable, 0, m_pTree->m_stats.m_treeHeight);
            m_pTree->insertData_impl(n->m_pDataLength[cChild], n->m_pData[cChild], *(n->m_ptrMBR[cChild]), n->m_pIdentifier[cChild], n->m_level, overflowTable);
            n->m_pData[cChild] = nullptr;
            delete[] overflowTable;
        }
        if (n.get() == this) n.relinquish();
    }
}