PVD2XDMF.cpp

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#include <tclap/CmdLine.h>
 
#include <array>
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/xml_parser.hpp>
#include <string>
 
#include "BaseLib/FileTools.h"
#include "BaseLib/Logging.h"
#include "BaseLib/MPI.h"
#include "BaseLib/MemWatch.h"
#include "BaseLib/StringTools.h"
#include "BaseLib/TCLAPArguments.h"
#include "InfoLib/GitInfo.h"
#include "MeshLib/Elements/Element.h"
#include "MeshLib/IO/XDMF/XdmfHdfWriter.h"
#include "MeshLib/IO/readMeshFromFile.h"
#include "MeshLib/Mesh.h"
 
// TODO (naumov) use std::filesystem::path
std::vector<std::pair<double, std::string>> readPvd(
    std::string const& pvd_filename)
{
    DBUG("Start reading the PVD file {:s}", pvd_filename);
    boost::property_tree::ptree pvd;
    read_xml(pvd_filename, pvd,
             boost::property_tree::xml_parser::trim_whitespace);
 
    std::vector<std::pair<double, std::string>> timeseries;
    for (auto const& dataset : pvd.get_child("VTKFile.Collection"))
    {
        if (dataset.first != "DataSet")
        {
            OGS_FATAL("Expected DataSet tag but got '{:s}'", dataset.first);
        }
 
        auto const time = dataset.second.get<double>("<xmlattr>.timestep");
        auto const file = dataset.second.get<std::string>("<xmlattr>.file");
        timeseries.emplace_back(time, file);
    }
    DBUG("Finished reading the PVD file {:s}", pvd_filename);
 
    return timeseries;
}
 
template <typename T>
bool copyPropertyVector(MeshLib::Properties const& properties,
                        MeshLib::PropertyVectorBase* destination_pv)
{
    if (!dynamic_cast<MeshLib::PropertyVector<T>*>(destination_pv))
    {
        return false;
    }
 
    auto const* pv = properties.getPropertyVector<T>(
        destination_pv->getPropertyName(), destination_pv->getMeshItemType(),
        destination_pv->getNumberOfGlobalComponents());
 
    assert(pv != nullptr);
 
    std::copy(
        std::begin(*pv), std::end(*pv),
        std::begin(dynamic_cast<MeshLib::PropertyVector<T>&>(*destination_pv)));
 
    return true;
}
 
void testIfMeshesAreEqual(MeshLib::Mesh const& mesh,
                          MeshLib::Mesh const& main_mesh,
                          std::string error_message)
{
    if (mesh.getDimension() != main_mesh.getDimension())
    {
        OGS_FATAL(
            "{:s}The mesh has dimension {} which is different from the "
            "dimension {} of in the main mesh.",
            error_message, mesh.getDimension(), main_mesh.getDimension());
    }
    if (mesh.getNumberOfElements() != main_mesh.getNumberOfElements())
    {
        OGS_FATAL(
            "{:s}The mesh has {} elements which is different from the number "
            "of elements ({}) in the main mesh.",
            error_message, mesh.getNumberOfElements(),
            main_mesh.getNumberOfElements());
    }
    if (mesh.getNumberOfNodes() != main_mesh.getNumberOfNodes())
    {
        OGS_FATAL(
            "{:s}The mesh has {} nodes which is different from the number of "
            "nodes ({}) in the main mesh.",
            error_message, mesh.getNumberOfNodes(),
            main_mesh.getNumberOfNodes());
    }
}
 
int main(int argc, char* argv[])
{
    TCLAP::CmdLine cmd(
        "Converts a time series from PVD to XDMF format.\n\n"
        "OpenGeoSys-6 software, version " +
            GitInfoLib::GitInfo::ogs_version +
            ".\n"
            "Copyright (c) 2012-2025, OpenGeoSys Community "
            "(http://www.opengeosys.org)",
        ' ', GitInfoLib::GitInfo::ogs_version);
 
    auto log_level_arg = BaseLib::makeLogLevelArg();
    cmd.add(log_level_arg);
 
    TCLAP::UnlabeledValueArg<std::string> pvd_file_arg(
        "pvd-file", "Input (.pvd) file", true, "", "INPUT_FILE");
    cmd.add(pvd_file_arg);
 
    TCLAP::ValueArg<std::string> outdir_arg(
        "o", "output-directory", "Output. The output directory to write to",
        false, ".", "OUTPUT_PATH");
    cmd.add(outdir_arg);
 
    cmd.parse(argc, argv);
 
    BaseLib::MPI::Setup mpi_setup(argc, argv);
    BaseLib::initOGSLogger(log_level_arg.getValue());
 
    auto const pvd_file_dir = BaseLib::extractPath(pvd_file_arg.getValue());
 
    auto const timeseries = readPvd(pvd_file_arg.getValue());
 
    if (timeseries.empty())
    {
        OGS_FATAL("Empty time series.");
    }
 
    // Initialized from the first timeseries entry and data is updated for each
    // subsequent time step.
    std::unique_ptr<MeshLib::Mesh> main_mesh;
 
    std::filesystem::path const output_file{
        BaseLib::extractBaseNameWithoutExtension(pvd_file_arg.getValue()) +
        ".xdmf"};
    std::filesystem::path output_file_path{outdir_arg.getValue()};
    if (outdir_arg.getValue() != "")
    {
        output_file_path =
            BaseLib::joinPaths(outdir_arg.getValue(), output_file.string());
    }
    std::set<std::string> variable_output_names;
    std::unique_ptr<MeshLib::IO::XdmfHdfWriter> mesh_xdmf_hdf_writer;
    // read first file in the time series; it is determining variables.
    {
        auto [time, filename] = timeseries[0];
        DBUG("{} - {}", time, filename);
 
        main_mesh.reset(MeshLib::IO::readMeshFromFile(
            BaseLib::joinPaths(pvd_file_dir, filename)));
        if (main_mesh == nullptr)
        {
            OGS_FATAL("Could not read mesh from '{:s}'.",
                      BaseLib::joinPaths(pvd_file_dir, filename));
        }
 
        for (auto const& p : main_mesh->getProperties())
        {
            variable_output_names.insert(std::string(p.first));
        }
        mesh_xdmf_hdf_writer = std::make_unique<MeshLib::IO::XdmfHdfWriter>(
            std::vector{std::cref(*main_mesh)}, output_file_path,
            0 /*timestep*/, time, variable_output_names,
            true /*output_file.compression*/, 1 /*output_file.n_files*/,
            1048576 /*chunk_size_bytes*/);
    }
 
    for (std::size_t timestep = 1; timestep < timeseries.size(); ++timestep)
    {
        auto [time, filename] = timeseries[timestep];
        DBUG("{} - {}", time, filename);
 
        std::unique_ptr<MeshLib::Mesh> mesh{MeshLib::IO::readMeshFromFile(
            BaseLib::joinPaths(pvd_file_dir, filename))};
        if (mesh == nullptr)
        {
            OGS_FATAL("Could not read mesh from '{:s}'.",
                      BaseLib::joinPaths(pvd_file_dir, filename));
        }
 
        testIfMeshesAreEqual(
            *mesh, *main_mesh,
            fmt::format("Error in comparison of mesh from file '{:s}' to the "
                        "main mesh:\n",
                        BaseLib::joinPaths(pvd_file_dir, filename)));
 
        // We have to copy the values because the xdmf writer remembers the data
        // pointers. Therefore replacing the properties will not work.
        for (auto& [name, pv] : main_mesh->getProperties())
        {
            if (copyPropertyVector<double>(mesh->getProperties(), pv) ||
                copyPropertyVector<float>(mesh->getProperties(), pv) ||
                copyPropertyVector<int>(mesh->getProperties(), pv) ||
                copyPropertyVector<long>(mesh->getProperties(), pv) ||
                copyPropertyVector<unsigned>(mesh->getProperties(), pv) ||
                copyPropertyVector<unsigned long>(mesh->getProperties(), pv) ||
                copyPropertyVector<std::size_t>(mesh->getProperties(), pv) ||
                copyPropertyVector<char>(mesh->getProperties(), pv) ||
                copyPropertyVector<unsigned char>(mesh->getProperties(), pv))
            {
                continue;
            }
            OGS_FATAL(
                "Could not copy property vector '{:s}' from '{:s}' mesh to the "
                "main_mesh.",
                name, BaseLib::joinPaths(pvd_file_dir, filename));
        }
 
        mesh_xdmf_hdf_writer->writeStep(time);
    }
    return EXIT_SUCCESS;
}