msh_pvdreader.cc

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/*!
 *
 * Copyright (C) 2015 Technical University of Liberec.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License version 3 as published by the
 * Free Software Foundation. (http://www.gnu.org/licenses/gpl-3.0.en.html)
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
 *
 *
 * @file    msh_pvdreader.cc
 * @brief
 * @author  dalibor
 */


#include <iostream>
#include <vector>
#include <pugixml.hpp>

#include "msh_pvdreader.hh"
#include "msh_vtkreader.hh"



PvdMeshReader::PvdMeshReader(const FilePath &file_name)
: BaseMeshReader(file_name)
{
    data_section_name_ = "DataArray";
    has_compatible_mesh_ = false;
    pvd_path_dir_ = file_name.parent_path();
    make_header_table();
}


PvdMeshReader::~PvdMeshReader()
{
    for (auto file_data : file_list_) {
        if (file_data.reader != nullptr) delete file_data.reader;
    }
}


void PvdMeshReader::read_physical_names(Mesh * mesh) {
    // will be implemented later
}


void PvdMeshReader::read_nodes(Mesh * mesh) {
    ASSERT(false).error("Reading of VTK mesh is not supported yet!");
    // will be implemented later
}


void PvdMeshReader::read_elements(Mesh * mesh) {
    // will be implemented later
}


void PvdMeshReader::read_element_data(ElementDataCacheBase &data_cache, MeshDataHeader actual_header, unsigned int n_components,
        bool boundary_domain) {

    ASSERT(!boundary_domain).error("Reading PVD data of boundary elements is not supported yet!\n");
    list_it_->reader->read_element_data(data_cache, actual_header, n_components, boundary_domain);
}


void PvdMeshReader::check_compatible_mesh(Mesh &mesh) {
    ASSERT(file_list_.size()).error("Empty PVD file, no DataSet tag found.\n");
    ASSERT(file_list_[0].reader == nullptr).error("Method check_compatible_mesh must be called as first, before reading element data.\n");

    file_list_[0].reader = new VtkMeshReader(file_list_[0].file_name, this->element_data_values_, file_list_[0].time);
    file_list_[0].reader->check_compatible_mesh(mesh);

    this->bulk_elements_id_ = file_list_[0].reader->bulk_elements_id_;
    this->boundary_elements_id_ = file_list_[0].reader->boundary_elements_id_;
    this->has_compatible_mesh_ = true;
}


void PvdMeshReader::make_header_table() {
    pugi::xml_document doc;;
    doc.load_file( tok_.f_name().c_str() );
    pugi::xml_node node = doc.child("VTKFile").child("Collection");

    double last_time = -numeric_limits<double>::infinity(); // check ascending order of times
    std::vector<std::string> sub_paths; //allow construct paths of VTK files
    sub_paths.resize(2);
    sub_paths[0] = pvd_path_dir_;

    // read PVD data
    for (pugi::xml_node subnode = node.child("DataSet"); subnode; subnode = subnode.next_sibling("DataSet")) {
        double time = subnode.attribute("timestep").as_double();
        if (time <= last_time) {
            WarningOut().fmt("Wrong time order in PVD file '{}', time '{}'. Skipping this time step.\n", tok_.f_name(), time );
        } else {
            sub_paths[1] = subnode.attribute("file").as_string();
            FilePath vtk_path(sub_paths, FilePath::input_file);
            last_time = time;
            file_list_.push_back( VtkFileData(time, vtk_path) );
        }
    }
}


BaseMeshReader::MeshDataHeader & PvdMeshReader::find_header(BaseMeshReader::HeaderQuery &header_query) {
    auto comp = [](double t, const VtkFileData &a) {
        return t * (1.0 + 2.0*numeric_limits<double>::epsilon()) < a.time;
    };

    // find iterator to data of VTK file
    list_it_ = std::upper_bound(file_list_.begin(),
            file_list_.end(),
            header_query.time,
            comp);
    --list_it_;

    // check if VTK reader exists and eventually creates its
    if (!list_it_->reader) {
        list_it_->reader = new VtkMeshReader(list_it_->file_name, this->element_data_values_, list_it_->time);
        list_it_->reader->bulk_elements_id_ = this->bulk_elements_id_;
        list_it_->reader->boundary_elements_id_ = this->boundary_elements_id_;
        list_it_->reader->has_compatible_mesh_ = true;
    }

    actual_header_ = list_it_->reader->find_header(header_query);
    return actual_header_;
}