[Solved] CS161-Week 10

You will be writing a Library simulator. It will have three classes: Book, Patron and Library. To make things a little simpler for you, I am supplying you with the three .hpp files. You will write the three implementation files. You should not alter the provided .hpp files.

A couple of notes:

• The vector::erase() function lets you delete an element of a vector, shifting over all the elements after it.
• Youll see in Book.hpp a line that says class Patron;. That is a forward declaration. It doesnt say anything about the definition of the Paton class, but it promises the compiler that there will be a type named Patron. The reason we dont just say #include Patron.hpp is that both Book and Patron need to know about each other, but they cant both #include the other because that would create a cyclic dependency.

Here are the .hpp files: Book.hpp, Patron.hpp and Library.hpp

Here are descriptions of the three classes:

Book:

• idCode a unique identifier for a Book (think library bar code, not ISBN)
• title cannot be assumed to be unique
• author the idCode, title and author dont need set methods, since they will never change after the object has been created, therefore these fields can be initialized directly within the constructor
• location a Book can be either on the shelf, on the hold shelf, or checked out
• checkedOutBy pointer to the Patron who has it checked out (if any)
• requestedBy pointer to the Patron who has requested it (if any); a Book can only be requested by one Patron at a time
• dateCheckedOut when a book is checked out, this will be set to the currentDate of the Library
• CHECK_OUT_LENGTH constant that gives how long a Book can be checked out for
• constructor takes an idCode, title and author; checkedOutBy and requestedBy should be initialized to NULL; a new Book should be on the shelf
• some get and set methods

Patron:

• idNum a unique identifier for a Patron
• name cannot be assumed to be unique
• checkedOutBooks a vector of pointers to Books that Patron currently has checkedOut
• fineAmount how much the Patron owes the Library in late fines (measured in dollars); this is allowed to go negative
• a constructor that takes an idNum and name and initializes fineAmount to zero
• some get and set methods
• addBook adds the specified Book to checkedOutBooks
• removeBook removes the specified Book from checkedOutBooks
• amendFine a positive argument increases the fineAmount, a negative one decreases it

Library:

• holdings a vector of pointers to Books in the Library
• members a vector of pointers to Patrons in the Library
• currentDate stores the current date represented as an integer number of days since the Library object was created
• a constructor that initializes the currentDate to zero
• addBook adds the parameter to holdings
• addPatron adds the parameter to members
• getBook returns a pointer to the Book corresponding to the ID parameter, or NULL if no such Book is in the holdings
• getPatron returns a pointer to the Patron corresponding to the ID parameter, or NULL if no such Patron is a member
• checkOutBook
  • if the specified Book is not in the Library, return book not found

if the specified Patron is not in the Library, return patron not found

if the specified Book is already checked out, return book already checked out

if the specified Book is on hold by another Patron, return book on hold by other patron

otherwise update the Books checkedOutBy, dateCheckedOut and Location; if the Book was on hold for this Patron, update requestedBy; update the Patrons checkedOutBooks; return check out successful

• returnBook
  • 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 Patrons checkedOutBooks; update the Books location depending on whether another Patron has requested it; update the

Books checkedOutBy; return return successful

• requestBook
  • if the specified Book is not in the Library, return book not found

if the specified Patron is not in the Library, return patron not found

if the specified Book is already requested, return book already on hold

update the Books requestedBy; if the Book is on the shelf, update its location to on hold; return request successful

• payFine
  • takes as a parameter the amount that is being paid (not the negative of that amount)

if the specified Patron is not in the Library, return patron not found

use amendFine to update the Patrons fine; return payment successful

• incrementCurrentDate
  • increment current date; increase each Patrons fines by 10 cents for each overdue Book they have checked out (using amendFine)

If a book is checked out on day 0, then on day 1, the patron has had it for 1 day. On day 21, the patron has had it for 21 days, so it is still not overdue. On day 22, the book is overdue and fines will be charged.

• be careful a Book can be on request without its location being the hold shelf (if another Patron has it checked out);

One limited example of how your classes might be used is:

Book b1(123, War and Peace, Tolstoy);

Book b2(234, Moby Dick, Melville);

Book b3(345, Phantom Tollbooth, Juster);

Patron p1(abc, Felicity);

Patron p2(bcd, Waldo);

Library lib; lib.addBook(&b1); lib.addBook(&b2); lib.addBook(&b3); lib.addPatron(&p1); lib.addPatron(&p2); lib.checkOutBook(bcd, 234); for (int i=0; i<7; i++) lib.incrementCurrentDate(); lib.checkOutBook(bcd, 123); lib.checkOutBook(abc, 345); for (int i=0; i<24; i++) lib.incrementCurrentDate(); lib.payFine(bcd, 0.4); double p1Fine = p1.getFineAmount(); double p2Fine = p2.getFineAmount();

This example obviously doesnt include all of the functions described above. You are responsible for testing all of the required functions to make sure they operate as specified.