graziaferrara / midterm_homework_DAA

Midterm homework of the Design and analysis of algorithm course

WebSite Organization and Search Engine Implementation

WebSite Organization

Classes:

1. Element: Models either directories or webpages.
2. WebSite: Represents a website and provides methods for managing its structure.

Public Methods:

• WebSite(host): Creates a new WebSite object for saving the website hosted at host.
• getHomePage(): Returns the home page of the website.
• getSiteString(): Returns a string showing the structure of the website.
• insertPage(url, content): Saves and returns a new page of the website.
• getSiteFromPage(page): Given a page, returns the WebSite object it belongs to.

Private Methods:

• __hasDir(ndir, cdir): Checks if a directory exists in the current directory.
• __newDir(ndir, cdir): Creates a new directory if it doesn't exist.
• __hasPage(npag, cdir): Checks if a webpage exists in the current directory.
• __newPage(npag, cdir): Creates a new webpage if it doesn't exist.
• __isDir(elem): Checks if an element is a directory.
• __isPage(elem): Checks if an element is a webpage.

Search Engine

Classes:

1. InvertedIndex: Represents the core data structure of the search engine.

Public Methods:

• InvertedIndex(): Creates a new empty InvertedIndex.
• addWord(keyword): Adds a keyword to the InvertedIndex.
• addPage(page): Processes a webpage and updates the inverted index.
• getList(keyword): Retrieves the occurrence list for a given keyword.

SearchEngine Class

Methods:

• SearchEngine(namedir): Initializes the SearchEngine with a directory containing webpage files.
• search(keyword, k): Searches for the top k web pages with the maximum occurrences of the keyword.

Efficiency Goals:

• Constant time complexity for various operations.
• Linear time complexity for generating site structure.
• Logarithmic time complexity for directory and page existence checks.
• Linear time complexity for adding keywords and retrieving occurrence lists.

Note:

• The implementation aims to optimize efficiency for website organization and search queries.
• A test dataset is provided for evaluating the correctness and performance of the code.