class BookList():
"""
This class encapsulates the book list and adds easy to use methods for manipulating it
"""
def __init__(self):
self.bookList = list()
self.validator = Validator()
def addNewBook(self, title, author, description):
"""
Adds a new book to the book list
All the parameters are strings
Returns an error list generated by the Validator
O(1)
"""
book = Book(title, author, description)
errorList = self.validator.validateBook(book)
if errorList != []:
return errorList
self.bookList.append(book)
def removeBook(self, book, p):
"""
Public method that overwrites the one in BookList
Extra functionality: Writes the entire list to the file
Best case O(1)
Worst case O(n)
Average case O(n)
"""
if self.bookList[p] == book:
self.bookList.pop(p)
return True
else:
ret = self.removeBook(book, p+1)
if ret != True:
return False
else:
return True
def updateBook(self, oldTitle, oldAuthor, oldDescription, \
newTitle, newAuthor, newDescription):
"""
Replaces a book from the list with a new book
All the parameters are strings
Returns False if the book is not found, True otherwise
O(n)
"""
book = Book(oldTitle, oldAuthor, oldDescription)
newBook = Book(newTitle, newAuthor, newDescription)
found = False
for bookInList in reversed(self.bookList):
if bookInList == book:
found = True
self.bookList[self.bookList.index(bookInList)] = newBook
return found
def numberOfBooks(self):
"""
Returns the number of books from the list
O(1)
"""
return len(self.bookList)
def lastAddedBook(self):
"""
Returns the instance of the latest added book
O(1)
"""
return self.bookList[len(self.bookList) - 1]
def bookInList(self, title, author, description):
"""
Returns a list of book instances that have the passed details
All the parameters are strings
O(n)
"""
book = Book(title, author, description)
booksFound = []
for bookInList in reversed(self.bookList):
if bookInList == book:
booksFound.append(bookInList)
return booksFound
def findBook(self, query):
"""
Searches for a book in the list
query is a string
Returns a list of found books
O(n)
"""
booksFound = list()
for bookInList in reversed(self.bookList):
if bookInList.getAuthor() == query or bookInList.getTitle() == query or bookInList.getDescription() == query:
booksFound.append(bookInList)
return booksFound
def orderBooks(self, direction):
"""
Returns a sorted list of books by popularity based on the direction passed
direction can be either "asc" or "desc"
O(n)
"""
reverse = True
if direction == "asc":
reverse = False
return sorted(self.bookList, key=lambda book:book.getPopularity(), reverse=reverse)
def lendBook(self, books, client):
"""
Sets a book's borrowed property to True
books is a list of Book instances
client is an instance of a Client
returns the instance of the book that was set or False if all the books are borrowed
O(n)
"""
for book in books:
if not book.isBorrowed():
book.setBorrowed(True)
return book
return False
def returnBook(self, books, client):
"""
Sets a book's borrowed property to False
books is a list of Book instances
client is an instance of a Client
Returns the instance of the book that was set or False if all the books are borrowed
O(n)
"""
for book in books:
if book.isBorrowed():
book.setBorrowed(False)
return book
return False
def __str__(self):
bookList = ""
for book in self.bookList:
bookList += str(book) + '\n'
return bookList
