⌛⌛ Movie data vs stream¶

Place your code into files named Movie.java and MovieAnalytics.java in the directory Round8/streams. Also remember to pull task material from student_template_project.

This task concerns basic use of Java streams. The goal is to implement a class MovieAnalytics that offers functions for reading movie data from a file and then processing the data with Java streams. You also need to implement a simple class Movie for representing movie data.

Implement these two classes as follows:

• The class Movie should have the following public features:

  • Constructor Movie(String title, int releaseYear, int duration, String genre, double score, String director) that initializes the object to holds the information provided by the constructor parameters: movie title, release year, duration, genre, rating score and director.

  • Getter functions for all these: e.g. getTitle(), getReleaseYear(), and so on.

• The class MovieAnalytics should have the following public features:

  • Constructor MovieAnalytics() that initializes an empty movie database. E.g. a simple Movie list will suffice for this task.

  • Static member function Consumer<Movie> showInfo() that returns an object that implements the interface Consumer<Movie> and whose function accept(Movie t) prints out information of the movie t in the form “title (By director, releaseYear)\\n” (see the example output files for details).

  • Member function void populateWithData(String fileName) that reads movie data from the file spedicifed by the parameter.

    • The file is expected to contain lines of form “title;releaseYear;duration;genre;score;director”. That is, each line describes one movie and includes the same set of information that the constructor of Movie takes as parameters.

      • A straight-forward split operation using a semicolon as a separator will work fine. Then you just need to convert some parts into suitable numbers.

  • Member function Stream<Movie> moviesAfter(int year) that returns a stream that lists all movies released in the year year or later.

  • Member function Stream<Movie> moviesBefore(int year) that returns a stream that lists all movies released in the year year or earlier.

  • Member function Stream<Movie> moviesBetween(int yearA, int yearB) that returns a stream that lists all movies released between the years yearA and yearB (including also yearA and yearB).

  • Member function Stream<Movie> moviesByDirector(String director)``that returns a stream that lists all movies directed by ``director.

The last four functions must return a stream that lists the movies in ascending order of release year. Movies with the same release year are orderd by title (using the natural String order).

A note about returning a stream: return a stream that has been set to perform intermediate (but no terminal) operations. E.g a stream that lists the unique items of the array int[] ia = [1, 2, 5, 4, 2, 5, 4] in sorted order could be created and returned as return Arrays.stream(ia).distinct().sorted();. The recipient of this stream could then read the values 1, 2, 4 and 5 from the stream.