Library-System-Simulation/patronDatabase.cpp at main · lexical-wiz/Library-System-Simulation · GitHub

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/**
 * @file patronDatabase.h
 * @author Alex Lambert
 *
 * Description:
 *   - PatronDatabase holds all of the patrons for a library
 *   - It can retrieve patrons and insert patrons
 *   - There is no functionality for removing patrons from the database
 *
 * Assumptions/Implementation:
 *   - Creates patrons based on the string, which can only have 1 format
 *   - Uses a BSTree to store the patrons
 */

#include "patronDatabase.h"

using namespace std;

//---------------------------------------------------------------------------
/** PatronDatabase()
 * Default Constructor
 *
 * Constructs an empty PatronDatabase
 * @pre None
 * @post PatronDatabase is initialized with a BSTree for Patrons
 */
PatronDatabase::PatronDatabase()
{
    patronBST = new BSTree();
}

//---------------------------------------------------------------------------
/** ~PatronDatabase()
 * Default Destructor
 *
 * Destroys the PatronDatabase and every item inside it
 * @pre None
 * @post All memory used by the PatronDatabase and its parts is
 * deallocated
 */
PatronDatabase::~PatronDatabase()
{
    delete patronBST;
}

//---------------------------------------------------------------------------
/** insertPatron()
 * Insert Patron Function
 *
 * Inserts the given Patron into the BSTree
 * @param patronInfo is a string holding the new patron's ID and name
 * @pre patronInfo is properly formatted
 * @post the new patron is added, if the Patron is valid
 * @return if the patron was successfully inserted
 */
bool PatronDatabase::insertPatron(string patronInfo)
{
    Patron* newPatron = createPatron(patronInfo);
    if (!newPatron)
        return false;

    return patronBST->insert(newPatron);
}

//---------------------------------------------------------------------------
/** getPatron()
 * Get Patron Function
 *
 * Return a Patron object based on the information that is passed in if
 * it is in a BSTree
 * @param patronInfo is a string holding the patron's ID that you're
 * searching for
 * @pre patronInfo is properly formatted
 * @post None. No changes made
 * @return Pointer to the Patron object that they are looking for, if it
 * wasn't found, returns nullptr.
 */
Patron* PatronDatabase::getPatron(string patronInfo) const
{
    Patron* newPatron = createPatron(patronInfo);
    if (!newPatron)
        return nullptr;

    Patron* toReturn = (Patron*)patronBST->retrieve(newPatron);
    delete newPatron;
    newPatron = nullptr;
    return toReturn;
}

//---------------------------------------------------------------------------
/** createPatron()
 * Create Patron Function
 *
 * Creates a patron based on patronInfo
 * @param patronInfo is a string holding the patron's ID and name
 * @pre patronInfo is properly formatted
 * @post None
 * @return Pointer to the new Patron, or nullptr if it was invalid
 */
Patron* PatronDatabase::createPatron(string patronInfo) const
{
    stringstream patronStream(patronInfo);
    int id;
    string name = "";

    patronStream >> id;
    if (id == 9999)
        return nullptr;

    patronStream.get();
    getline(patronStream, name);

    return new Patron(id, name);
}