I3SReader.cpp

/******************************************************************************
* Copyright (c) 2018, Kyle Mann (kyle@hobu.co)
*
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#include "I3SReader.hpp"

namespace pdal
{

    static PluginInfo const i3sInfo
    {
        "readers.i3s",
        "I3S Reader",
        "http://pdal.io/stages/readers.i3s.html"
    };

    CREATE_SHARED_STAGE(I3SReader, i3sInfo)

    std::string I3SReader::getName() const { return i3sInfo.name; }

    void I3SReader::initInfo()
    {
        try
        {
            m_info = parse(m_arbiter->get(m_filename))["layers"][0];
        }catch(pdal_error& )
        {
            throwError(std::string("Error parsing Json object. "
                        "This could be due to a bad endpoint."));
        }
        if(m_info.empty())
            throwError(std::string("Incorrect Json object"));

        m_filename += "/layers/0";
    }

    //Traverse tree through nodepages. Create a nodebox for each node in
    //the tree and test if it overlaps with the bounds created by user.
    //If it's a leaf node(the highest resolution) and it overlaps, add
    //it to the list of nodes to be pulled later.
    void I3SReader::buildNodeList(std::vector<int>& nodes, int pageIndex)
    {
        Json::Value nodeIndexJson;
        std::string nodeUrl = m_filename + "/nodepages/"
            + std::to_string(pageIndex);

        nodeIndexJson = parse(m_arbiter->get(nodeUrl));

        int pageSize = nodeIndexJson["nodes"].size();
        int initialNode = nodeIndexJson["nodes"][0]["resourceId"].asInt();

        for (int i = 0; i < pageSize; i++)
        {
            BOX3D nodeBox = parseBox(nodeIndexJson["nodes"][i]);
            int cCount = nodeIndexJson["nodes"][i]["childCount"].asInt();
            bool overlap = m_bounds.overlaps(nodeBox);
            if (cCount == 0 && overlap)
            {
                int name = nodeIndexJson["nodes"][i]["resourceId"].asInt();
                nodes.push_back(name);
            }
            //keeps track of largest node so recursive loop knows when to stop
            if ((nodeIndexJson["nodes"][i]["firstChild"].asInt() +
                    cCount - 1) > m_maxNode)
            {
                m_maxNode = nodeIndexJson["nodes"][i]["firstChild"].asInt() +
                    cCount - 1;
            }
            else if (initialNode + i == m_maxNode)
                return;
        }
        buildNodeList(nodes, ++pageIndex);
    }

    std::vector<char> I3SReader::fetchBinary(std::string url,
            std::string attNum, std::string ext) const
    {
        // For the REST I3S endpoint there are no file extensions.
        return m_arbiter->getBinary(url + attNum);
    }

} //namespace pdal