reader_cache.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    reader_cache.cc
 * @brief   
 */

#include "io/reader_cache.hh"
#include "io/msh_gmshreader.h"
#include "io/msh_vtkreader.hh"
#include "io/msh_pvdreader.hh"
#include "input/accessors.hh"


/***********************************************************************************************
 * Implementation of ReaderCache
 */

ReaderCache * ReaderCache::instance() {
    static ReaderCache *instance = new ReaderCache;
    return instance;
}

std::shared_ptr<BaseMeshReader> ReaderCache::get_reader(const FilePath &file_path) {
    return ReaderCache::get_reader_data(file_path)->second.reader_;
}

std::shared_ptr<Mesh> ReaderCache::get_mesh(const FilePath &file_path) {
    auto it = ReaderCache::get_reader_data(file_path);
    // Create and fill mesh if doesn't exist
    if ( (*it).second.mesh_ == nullptr ) {
        (*it).second.mesh_ = std::make_shared<Mesh>( Input::Record() );
        (*it).second.reader_->read_raw_mesh( (*it).second.mesh_.get() );
        (*it).second.reader_->check_compatible_mesh( *((*it).second.mesh_) );

    }
    return (*it).second.mesh_;
}

ReaderCache::ReaderTable::iterator ReaderCache::get_reader_data(const FilePath &file_path) {
    ReaderTable::iterator it = ReaderCache::instance()->reader_table_.find( string(file_path) );
    if (it == ReaderCache::instance()->reader_table_.end()) {
        ReaderData reader_data;
        if ( file_path.extension() == ".msh" ) {
            reader_data.reader_ = std::make_shared<GmshMeshReader>(file_path);
        } else if ( file_path.extension() == ".vtu" ) {
            reader_data.reader_ = std::make_shared<VtkMeshReader>(file_path);
        } else if ( file_path.extension() == ".pvd" ) {
            reader_data.reader_ = std::make_shared<PvdMeshReader>(file_path);
        } else {
            THROW(BaseMeshReader::ExcWrongExtension()
                << BaseMeshReader::EI_FileExtension(file_path.extension()) << BaseMeshReader::EI_MeshFile((string)file_path) );
        }
        ReaderCache::instance()->reader_table_.insert( std::pair<string, ReaderData>(string(file_path), reader_data) );
        it = ReaderCache::instance()->reader_table_.find( string(file_path) );
    }
    return it;
}