/// <summary>
/// This function remove the node for the movie.
/// </summary>
/// <param name="contentRoot"></param>
/// <param name="title"></param>
/// <returns></returns>
HelperNode removeNodeMovie(HelperNode contentRoot, string title)
{
if (contentRoot == null)
{
return(contentRoot);
}
int res = contentRoot.Movie.MovieTitle.CompareTo(title);
if (res < 0)
{
contentRoot.LeftNode = removeNodeMovie(contentRoot.LeftNode, title);
}
else if (res < 0)
{
contentRoot.RightNode = removeNodeMovie(contentRoot.RightNode, title);
}
else
{
if (contentRoot.LeftNode == null)
{
return(contentRoot.RightNode);
}
else if (contentRoot.RightNode == null)
{
return(contentRoot.LeftNode);
}
contentRoot.Movie = numberOfMoviesInNode(contentRoot.RightNode);
contentRoot.RightNode = removeNodeMovie(contentRoot.RightNode, contentRoot.Movie.MovieTitle);
}
return(contentRoot);
}
private HelperNode mostTimesBorrowedOrderMovieNode; //declaration of helperNode obj
/// <summary>
/// This function shows a list of popular movies that are rented 10 times.
/// </summary>
public void showingPopularMoviesRentedTenTimes()
{
check = 0;
mostTimesBorrowedOrderMovieNode = null;
mostTimesBorrowedOrderMovieNodeAddition(root);
showingPopularMoviesRentedTenTimes(mostTimesBorrowedOrderMovieNode);
}
/// <summary>
/// This function is a helper function of showing moives in an alphabetical order.
/// </summary>
/// <param name="helperNode"></param>
private void showMoviesInAlphaOrder(HelperNode helperNode)
{
if (helperNode != null)
{
showMoviesInAlphaOrder(helperNode.RightNode);
Console.Write(helperNode.Movie.ToString() + "\n");
showMoviesInAlphaOrder(helperNode.LeftNode);
}
}
/// <summary>
/// This function delete moives in the node or tree.
/// </summary>
/// <param name="movieName"></param>
/// <returns></returns>
public bool deleteMovie(string movieName)
{
HelperNode movieNodeObjRoot = removeNodeMovie(root, movieName);
if (movieNodeObjRoot != root)
{
return(false);
}
root = movieNodeObjRoot;
return(true);
}
/// <summary>
/// This method helps in showing the popular movies.
/// </summary>
/// <param name="hNode"></param>
private void showingPopularMoviesRentedTenTimes(HelperNode hNode)
{
if (hNode != null && check < 10)
{
check = check + 1;
showingPopularMoviesRentedTenTimes(hNode.RightNode);
Console.WriteLine(hNode.Movie.MovieTitle + " borrowed " +
hNode.Movie.MovieTimesRented.ToString() + " times.");
showingPopularMoviesRentedTenTimes(hNode.LeftNode);
}
}
/// <summary>
/// This method is a helper function of the member menu and shows the most times borrowed mobies in an order.
/// </summary>
/// <param name="hNode"></param>
private void mostTimesBorrowedOrderMovieNodeAddition(HelperNode hNode)
{
if (hNode != null)
{
mostTimesBorrowedOrderMovieNodeAddition(hNode.RightNode);
mostTimesBorrowedOrderMovieNode = sortedMoviesByRentedTimesInsertion(
mostTimesBorrowedOrderMovieNode,
hNode.Movie);
mostTimesBorrowedOrderMovieNodeAddition(hNode.LeftNode);
}
}
/// <summary>
/// This function is also a helper function which helps to check in binarytree.
/// </summary>
/// <param name="nodeShape"></param>
/// <returns></returns>
private int shape(HelperNode nodeShape)
{
if (nodeShape == null)
{
return(0);
}
else
{
return(shape(nodeShape.LeftNode) + 1 + shape(nodeShape.RightNode));
}
}
/// <summary>
/// This function is a helper function to view number of moveis in node.
/// </summary>
/// <param name="nodeRoot"></param>
/// <returns></returns>
private Movie numberOfMoviesInNode(HelperNode nodeRoot)
{
Movie inNodeMovie = nodeRoot.Movie;
while (nodeRoot.LeftNode != null)
{
inNodeMovie = nodeRoot.LeftNode.Movie;
nodeRoot = nodeRoot.LeftNode;
}
return(inNodeMovie);
}
/// <summary>
/// This is a helpernode method and is used to binarysearch tree and return and helps to sort movies by number of times they're rented.
/// </summary>
/// <param name="hNode"></param>
/// <param name="objMovie"></param>
/// <returns></returns>
private HelperNode sortedMoviesByRentedTimesInsertion(HelperNode hNode, Movie objMovie)
{
if (hNode == null)
{
return(new HelperNode(objMovie));
}
if (objMovie.MovieTimesRented < hNode.Movie.MovieTimesRented)
{
hNode.LeftNode = sortedMoviesByRentedTimesInsertion(hNode.LeftNode, objMovie);
}
else
{
hNode.RightNode = sortedMoviesByRentedTimesInsertion(hNode.RightNode, objMovie);
}
return(hNode);
}
/// <summary>
/// This funciton uses the Binary search algorithm and allow the staff to add movies.
/// </summary>
/// <param name="movie"></param>
/// <returns></returns>
public bool BinarySearchAddMovie(Movie movie)
{
HelperNode movieNode = new HelperNode(movie);
if (root == null)
{
root = movieNode;
return(true);
}
else
{
HelperNode newMovieNode = root;
HelperNode topMovieNode;
while (true)
{
topMovieNode = newMovieNode;
int res = newMovieNode.Movie.MovieTitle.CompareTo(movie.MovieTitle);
if (res < 0)
{
//Check the left node of the binarysearchtree. if the movie is can be stored there
//Then move to right node or child and check there.
newMovieNode = newMovieNode.LeftNode;
if (newMovieNode == null)
{
topMovieNode.LeftNode = movieNode;
return(true);
}
}
else if (res > 0)
{
//Checking the rightnode if it can store the movie.
newMovieNode = newMovieNode.RightNode;
if (newMovieNode == null)
{
topMovieNode.RightNode = movieNode;
return(true);
}
}
else
{
return(false);
}
}
}
}
/// <summary>
/// This is a helper function which does the movie borrowing process.
/// </summary>
/// <param name="rootObj"></param>
/// <param name="title"></param>
/// <returns></returns>
private bool movieBorrowingProcess(HelperNode rootObj, string title)
{
while (rootObj != null)
{
int res = rootObj.Movie.MovieTitle.CompareTo(title);
if (res < 0)
{
rootObj = rootObj.LeftNode;
}
else if (res > 0)
{
rootObj = rootObj.RightNode;
}
else
{
if (rootObj.Movie.MovieAvailableCopies > 0)
{
rootObj.Movie.howManyTimesRented();
return(true);
}
}
}
return(true);
}
/// <summary>
/// This is a constructor for the MovieCollectionClass
/// </summary>
public MovieCollection()
{
root = null;
}