Method makeJSONPipeline

kernels/TranslateKernel.cpp:117–164

Build a pipeline from a JSON filter specification. */

  Build a pipeline from a JSON filter specification.
*/
void TranslateKernel::makeJSONPipeline()
{
    std::string json;

    if (pdal::FileUtils::fileExists(m_filterJSON))
        json = pdal::FileUtils::readFileIntoString(m_filterJSON);

    if (json.empty())
        json = m_filterJSON;
    std::stringstream in(json);
    m_manager.readPipeline(in);

    std::vector<Stage *> roots = m_manager.roots();
    if (roots.size() > 1)
        throw pdal_error("Can't process pipeline with more than one root.");

    Stage *r(nullptr);
    if (roots.size())
        r = dynamic_cast<Reader *>(roots[0]);
    if (r)
    {
        StageCreationOptions ops { m_inputFile, m_readerType, nullptr,
            Options(), r->tag() };
        m_manager.replace(r, &m_manager.makeReader(ops));
    }
    else
    {
        r = &m_manager.makeReader(m_inputFile, m_readerType);
        if (roots.size())
            roots[0]->setInput(*r);
    }

    std::vector<Stage *> leaves = m_manager.leaves();
    if (leaves.size() != 1)
        throw pdal_error("Can't process pipeline with more than one "
            "terminal stage.");

    Stage *w = dynamic_cast<Writer *>(leaves[0]);
    if (w)
        m_manager.replace(w, &m_manager.makeWriter(m_outputFile, m_writerType));
    else
    {
        // We know we have a leaf because we added a reader.
        StageCreationOptions ops { m_outputFile, m_writerType, leaves[0],
            Options(), "" };  // These last two args just keep compiler quiet.
        m_manager.makeWriter(ops);
    }
}


/*