filemgr.h

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/*
 * SwatDB
 *
 * @authors: See Contributors.doc for code contributors
 *
 * Copyright (c) 2020 Swarthmore College Computer Science Department
 * Swarthmore PA, Professors Tia Newhall, Ameet Soni
 */
 
#ifndef _SWATDB_FILEMGR_H_
#define  _SWATDB_FILEMGR_H_
 
#include <string>
#include <vector>
#include "swatdb_types.h"
 
// too many circular includes, just define these types like
// this and include the .h file for them in the .cpp files:
class BufferManager;
class Catalog;
class Schema;
class File;
 
class FileManager {
 
  public:
 
    FileManager(Catalog *cat, BufferManager *buf_mgr,
        bool load = false);  // default value paramater
 
    ~FileManager();
 
    FileId createRelation(std::string name, Schema *schema, CatType type,
        std::string file_name, bool save_on_exit = true);
 
    FileId createIndex(std::string name, std::vector<std::string> field_list,
        std::string index_file_name, FileId rel_fid, 
        bool save_on_exit = false);
    void removeRelation(std::string name);
 
    void removeFile(FileId file_id);
 
    File* getRelation(std::string name);
 
    File* getFile(FileId file_id);
 
 
    void printFile(FileId file_id, std::uint64_t max_to_print = 50);
 
    std::uint64_t getNumRecords(FileId file_id);
 
 
    void fileToText(FileId file_id, std::string file_name);
 
  protected:
 
    void _removeAllFiles();
 
    void _saveOrRemoveFiles();
 
    friend class SwatDB;
 
  private:
 
    void _loadAllFiles();
 
    void _loadFile(FileId fid);
 
    Catalog *catalog;
 
    BufferManager *buf_mgr;
 
};
 
#endif