C++ Book::getCheckedOutBy方法代码示例

/*******************************************************
**returnBook Description:
**	if the specified Book is not in the Library, return
**		"book not found"
**	if the Book is not checked out, return "book already
**		in library"
**	update the Patron's checkedOutBooks; update the
**		Book's location depending on whether another
**		Patron has requested it; update the Book's
**		checkedOutBy; return "return successful"
*******************************************************/
string Library::returnBook(std::string bID)
{
	//find if Book exists//
	if (getBook(bID) == NULL)
		return "Book was not found.";
	
	//find if Book //
	if (getBook(bID)->getLocation() != CHECKED_OUT)
		return "Book is already in Library.";
	else
	{
		//initiate local pointers if Book exists and is not CHECKED_OUT//
		Book* bPtr = getBook(bID);
		Patron* pPtr = bPtr->getCheckedOutBy();

		//remove Book from Patron's checkOutBooks//
		pPtr->removeBook(bPtr);

		//set Book's location based on request status//
		if (bPtr->getRequestedBy() == NULL)
			bPtr->setLocation(ON_SHELF);
		else
			bPtr->setLocation(ON_HOLD_SHELF);

		//set Book's checkedOutBy//
		bPtr->setCheckedOutBy(NULL);

		//return was successful//
		return "Return successful.";
	}
}

//Goes through the public properties of a book and prints them out.
//This will print out if a book is checked out AND who requested it, if that situation is true
void Library::viewBookInfo(std::string bookID)
{
    Book* book = GetBook(bookID);

    if(book == NULL)
    {
        std::cout << "No such holding exists." << std::endl;
    }
    else
    {
        std::cout << std::endl << "ID: " << book->getIdCode() << std::endl;
        std::cout << "Title: " << book->getTitle() << std::endl;
        std::cout << "Author: " << book->getAuthor() << std::endl;

        if(book->getLocation() == ON_SHELF)
        {
            std::cout << "Location: ON SHELF" << std::endl;
        }
        else if(book->getLocation() == ON_HOLD)
        {
            std::cout << "Location: ON HOLD" << std::endl;
            std::cout << "Requested By: " << book->getRequestedBy()->getName() << std::endl;
            std::cout << "Requested By ID: " << book->getRequestedBy()->getIdNum() << std::endl;
        }
        else
        {
            std::cout << "Location: CHECKED OUT" << std::endl;
            std::cout << "Checked out by: " << book->getCheckedOutBy()->getName() << std::endl;
            std::cout << "Checked out by ID: " << book->getCheckedOutBy()->getIdNum() << std::endl;
            std::cout << "Due date: " << book->getDateCheckedOut() + 21 << std::endl;

            if(book->getRequestedBy() != NULL)
            {
                std::cout << "This book is also requested by patron: " << book->getRequestedBy()->getIdNum()
                        << std::endl;

                std::cout << "It should be put on the hold shelf when checked back in." << std::endl;
            }
        }
    }
}

//Return a book, if it is not already on the shelf.
void Library::returnBook(std::string bookID)
{
    Book* book = GetBook(bookID);
    
    if(book == NULL)
    {
        std::cout << std::endl << "No such book in holdings." << std::endl << std::endl;
        return;
    }
    if(book->getLocation() == ON_SHELF)
    {
        std::cout << "This book is already on the shelf." << std::endl;
    }
    else if(book->getLocation() == ON_HOLD)
    {
        std::cout << "This book is on the hold shelf and cannot be returned." << std::endl;
    }
    else
    {
        Patron* patron = book->getCheckedOutBy();

        if(book->getRequestedBy() == NULL)
        {
            book->setLocation(ON_SHELF);
            book->setCheckedOutBy(NULL);
            book->setDateCheckedOut(-1);
            patron->removeBook(book);
        }
        else
        {
            book->setLocation(ON_HOLD);
            book->setCheckedOutBy(NULL);
            book->setDateCheckedOut(-1);
            patron->removeBook(book);
        }
    }
}