reader_cache.hh

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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.hh
 * @brief   
 */
 
#ifndef READER_CACHE_HH_
#define READER_CACHE_HH_
 
 
#include <map>                  // for map, map<>::value_compare
#include <memory>               // for shared_ptr
#include <string>               // for string
#include "system/file_path.hh"  // for FilePath
#include "system/index_types.hh" // for LongIdx
 
class BaseMeshReader;
class Mesh;
 
 
 
/**
 * Auxiliary class to map filepaths to instances of readers.
 */
class ReaderCache {
public:
    struct ReaderData {
        /// Constructor
        ReaderData() : target_mesh_element_map_(nullptr) {};
 
        std::shared_ptr<BaseMeshReader> reader_;
        std::shared_ptr<Mesh> mesh_;
        std::shared_ptr<std::vector<LongIdx>> target_mesh_element_map_;
    };
 
    typedef std::map< string, ReaderData > ReaderTable;
 
    /**
     * Returns reader of given FilePath.
     */
    static std::shared_ptr<BaseMeshReader> get_reader(const FilePath &file_path);
 
    /**
     * Returns mesh of given FilePath.
     */
    static std::shared_ptr<Mesh> get_mesh(const FilePath &file_path);
 
    /**
     * Fill element id vectors of reader without checking compatibility.
     */
    static void get_element_ids(const FilePath &file_path, const Mesh &mesh);
 
    /**
     * Returns shared vector mapping elements to target mesh.
     *
     * Reader and appropriate input data mesh are given by FilePath.
     * If map is not created method check_compatible_mesh of \p computational_mesh is called.
     */
    static std::shared_ptr<std::vector<LongIdx>> get_target_mesh_element_map(const FilePath &file_path, Mesh *computational_mesh, bool is_native);
 
private:
    /// Returns singleton instance
    static ReaderCache * instance();
 
    /// Constructor
    ReaderCache() {};
 
    /// Returns instance of given FilePath. If reader doesn't exist, creates new ReaderData object.
    static ReaderTable::iterator get_reader_data(const FilePath &file_path);
 
    /// Table of readers
    ReaderTable reader_table_;
};
 
 
#endif /* READER_CACHE_HH_ */