DBFile.h

#ifndef DBFILE_H
#define DBFILE_H

#include "GenericDBFile.h"
#include "HeapDBFile.h"
#include "SortedDBFile.h"
#include "PathConfig.h"

#include <iostream>
#include <fstream>
#include <cstring>

typedef enum {
    heap, sorted, tree
} fType;

class DBFile {
private:
    GenericDBFile *myInternalVar;

public:
    // constructor
    DBFile();

    ~DBFile();

    // Create File instance according to the file_type(fType)
    // fpath = file path where file should be created.
    // return 1 on successful creation of the file.
    int Create(const char *fpath, fType file_type, void *startup);

    // Open file if present.
    // Returns 0 if file is not present or file is already open.
    // Returns 1 if the file opened successfully.
    int Open(const char *fpath);

    // Close the currently opened file.
    // Returns 0 if the file is already closed.
    // Returns 1 if the file is closed successfully.
    int Close();

    // Load the database with the records.
    // First parameter should be Schema of the records.
    // Second parameter should be path from where data to be loaded.
    void Load(Schema &myschema, const char *loadpath);

    // Moves the current read pointer to the first record of the file.
    void MoveFirst();

    // Add record to the file.
    // After this call, addme will no longer have anything inside of it
    void Add(Record &addme);

    // Get next record from the file.
    // Record will be fetched inside the parameter i.e fetchme.
    int GetNext(Record &fetchme);

    // Get next record from the file which satisfies the passed cnf.
    // Record will be fetched inside the first parameter i.e fetchme.
    int GetNext(Record &fetchme, CNF &cnf, Record &literal);

};

#endif