Package rs.ac.bg.etf.sab.operations

Interface RatingsOperations

  • public interface RatingsOperations

    • Method Summary

      All Methods Instance Methods Abstract Methods 
      Modifier and Type Method Description
      boolean addRating​(java.lang.Integer userId, java.lang.Integer movieId, java.lang.Integer score)
      Adds a new rating for a movie by a specific user.
      java.util.List<java.lang.Integer> getRatedMoviesByUser​(java.lang.Integer userId)
      Retrieves all movies rated by a specific user.
      java.lang.Integer getRating​(java.lang.Integer userId, java.lang.Integer movieId)
      Retrieves the score of a rating for a specific movie by a specific user.
      java.util.List<java.lang.Integer> getUsersWhoRatedMovie​(java.lang.Integer movieId)
      Retrieves all users who rated a specific movie.
      boolean removeRating​(java.lang.Integer userId, java.lang.Integer movieId)
      Removes a rating for a specific movie given by a specific user.
      boolean updateRating​(java.lang.Integer userId, java.lang.Integer movieId, java.lang.Integer newScore)
      Updates the score of an existing rating.

    • Method Detail

      • addRating

        boolean addRating​(java.lang.Integer userId,
                  java.lang.Integer movieId,
                  java.lang.Integer score)
        Adds a new rating for a movie by a specific user.
        Parameters:
        userId - the unique identifier of the user giving the rating
        movieId - the unique identifier of the movie being rated
        score - the score assigned to the movie by the user
        Returns:
        true if the rating was successfully added, false if the rating already exists, false if the user cannot add that rating

      • updateRating

        boolean updateRating​(java.lang.Integer userId,
                     java.lang.Integer movieId,
                     java.lang.Integer newScore)
        Updates the score of an existing rating.
        Parameters:
        userId - the unique identifier of the user who gave the rating
        movieId - the unique identifier of the movie that was rated
        newScore - the new score to assign to the rating
        Returns:
        true if the rating was successfully updated, false if no rating exists, false if the user cannot update that rating

      • removeRating

        boolean removeRating​(java.lang.Integer userId,
                     java.lang.Integer movieId)
        Removes a rating for a specific movie given by a specific user.
        Parameters:
        userId - the unique identifier of the user who gave the rating
        movieId - the unique identifier of the movie that was rated
        Returns:
        true if the rating was successfully removed, false if no rating exists

      • getRating

        java.lang.Integer getRating​(java.lang.Integer userId,
                            java.lang.Integer movieId)
        Retrieves the score of a rating for a specific movie by a specific user.
        Parameters:
        userId - the unique identifier of the user who gave the rating
        movieId - the unique identifier of the movie that was rated
        Returns:
        the score of the rating, or null if no rating exists

      • getRatedMoviesByUser

        java.util.List<java.lang.Integer> getRatedMoviesByUser​(java.lang.Integer userId)
        Retrieves all movies rated by a specific user.
        Parameters:
        userId - the unique identifier of the user
        Returns:
        a list of movie IDs that the user has rated, or an empty list if no ratings exist

      • getUsersWhoRatedMovie

        java.util.List<java.lang.Integer> getUsersWhoRatedMovie​(java.lang.Integer movieId)
        Retrieves all users who rated a specific movie.
        Parameters:
        movieId - the unique identifier of the movie
        Returns:
        a list of user IDs who rated the movie, or an empty list if no ratings exist