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konstantinkruminkonstantinkrumin
authoredFeb 26, 2020
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‎Week 3/Assignment 1/EfficientRater.class

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‎Week 3/Assignment 1/EfficientRater.ctxt

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#BlueJ class context
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comment0.target=EfficientRater
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comment1.params=id
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comment1.target=EfficientRater(java.lang.String)
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comment2.params=item\ rating
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comment2.target=void\ addRating(java.lang.String,\ double)
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comment3.params=item
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comment3.target=boolean\ hasRating(java.lang.String)
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comment4.params=
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comment4.target=java.lang.String\ getID()
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comment5.params=item
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comment5.target=double\ getRating(java.lang.String)
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comment6.params=
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comment6.target=int\ numRatings()
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comment7.params=
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comment7.target=java.util.ArrayList\ getItemsRated()
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numComments=8

‎Week 3/Assignment 1/EfficientRater.java

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/**
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* EfficientRater class contains various methods that are used to add and extract ratings
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* from the ratings HashMap.
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*
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* @author (your name)
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* @version (a version number or a date)
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*/
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import java.util.*;
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public class EfficientRater implements Rater {
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private String myID;
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private HashMap<String,Rating> myRatings;
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public EfficientRater(String id) {
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myID = id;
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myRatings = new HashMap<String,Rating> ();
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}
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public void addRating(String item, double rating) {
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myRatings.put(item, new Rating(item,rating));
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}
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public boolean hasRating(String item) {
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if (myRatings.containsKey(item)) {
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return true;
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}
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return false;
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}
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public String getID() {
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return myID;
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}
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public double getRating(String item) {
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for (String movieID : myRatings.keySet()) {
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if (movieID.equals(item)) {
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return myRatings.get(movieID).getValue();
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}
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}
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return -1;
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}
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public int numRatings() {
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return myRatings.size();
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}
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public ArrayList<String> getItemsRated() {
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ArrayList<String> list = new ArrayList<String> ();
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for (String movieID : myRatings.keySet()) {
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list.add(myRatings.get(movieID).getItem());
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}
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return list;
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}
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}

‎Week 3/Assignment 1/FirstRatings.class

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‎Week 3/Assignment 1/FirstRatings.ctxt

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#BlueJ class context
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comment0.target=FirstRatings
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comment1.params=filename
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comment1.target=java.util.ArrayList\ loadMovies(java.lang.String)
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comment2.params=filename
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comment2.target=java.util.ArrayList\ loadRaters(java.lang.String)
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numComments=3

‎Week 3/Assignment 1/FirstRatings.java

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/**
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* loadMovies and loadRaters methods add data from the related csv files into corresponding
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* ArrayLists.
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*
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* @ Konstantin Krumin
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* @ Version: 1.0 (February 14, 2020)
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*/
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import edu.duke.*;
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import java.util.*;
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import org.apache.commons.csv.*;
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public class FirstRatings {
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public ArrayList<Movie> loadMovies (String filename) {
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ArrayList<Movie> movieData = new ArrayList<Movie> ();
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FileResource fr = new FileResource("data/" + filename + ".csv");
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CSVParser parser = fr.getCSVParser();
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for (CSVRecord record: parser) {
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String currentID = record.get(0);
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String currentTitle = record.get(1);
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String currentYear = record.get(2);
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String currentCountry = record.get(3);
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String currentGenre = record.get(4);
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String currentDirector = record.get(5);
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int currentMinutes = Integer.parseInt(record.get(6));
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String currentPoster = record.get(7);
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Movie currentMovie = new Movie(currentID, currentTitle, currentYear, currentGenre, currentDirector,
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currentCountry, currentPoster, currentMinutes);
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movieData.add(currentMovie);
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}
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return movieData;
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}
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public ArrayList<Rater> loadRaters (String filename) {
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ArrayList<Rater> ratersData = new ArrayList<Rater> ();
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ArrayList<String> listOfIDs = new ArrayList<String> ();
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FileResource fr = new FileResource("data/" + filename + ".csv");
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CSVParser parser = fr.getCSVParser();
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for (CSVRecord record : parser) {
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String currentRaterID = record.get(0);
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String currentMovieID = record.get(1);
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double currentMovieRating = Double.parseDouble(record.get(2));
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if (! listOfIDs.contains(currentRaterID)) {
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//Rater currentRater = new PlainRater(currentRaterID);
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Rater currentRater = new EfficientRater(currentRaterID);
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ratersData.add(currentRater);
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currentRater.addRating(currentMovieID, currentMovieRating);
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} else {
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for (int k=0; k < ratersData.size(); k++) {
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if (ratersData.get(k).getID().equals(currentRaterID)) {
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ratersData.get(k).addRating(currentMovieID, currentMovieRating);
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}
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}
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}
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listOfIDs.add(currentRaterID);
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}
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return ratersData;
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}
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}

‎Week 3/Assignment 1/Movie.class

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‎Week 3/Assignment 1/Movie.ctxt

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#BlueJ class context
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comment0.target=Movie
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comment1.params=anID\ aTitle\ aYear\ theGenres
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comment1.target=Movie(java.lang.String,\ java.lang.String,\ java.lang.String,\ java.lang.String)
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comment10.params=
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comment10.target=int\ getMinutes()
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comment11.params=
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comment11.target=java.lang.String\ toString()
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comment2.params=anID\ aTitle\ aYear\ theGenres\ aDirector\ aCountry\ aPoster\ theMinutes
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comment2.target=Movie(java.lang.String,\ java.lang.String,\ java.lang.String,\ java.lang.String,\ java.lang.String,\ java.lang.String,\ java.lang.String,\ int)
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comment3.params=
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comment3.target=java.lang.String\ getID()
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comment4.params=
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comment4.target=java.lang.String\ getTitle()
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comment5.params=
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comment5.target=int\ getYear()
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comment6.params=
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comment6.target=java.lang.String\ getGenres()
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comment7.params=
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comment7.target=java.lang.String\ getCountry()
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comment8.params=
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comment8.target=java.lang.String\ getDirector()
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comment9.params=
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comment9.target=java.lang.String\ getPoster()
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numComments=12

‎Week 3/Assignment 1/Movie.java

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import java.util.ArrayList;
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import java.util.Arrays;
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// An immutable passive data object (PDO) to represent item data
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public class Movie {
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private String id;
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private String title;
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private int year;
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private String genres;
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private String director;
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private String country;
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private String poster;
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private int minutes;
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public Movie (String anID, String aTitle, String aYear, String theGenres) {
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// just in case data file contains extra whitespace
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id = anID.trim();
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title = aTitle.trim();
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year = Integer.parseInt(aYear.trim());
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genres = theGenres;
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}
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public Movie (String anID, String aTitle, String aYear, String theGenres, String aDirector,
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String aCountry, String aPoster, int theMinutes) {
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// just in case data file contains extra whitespace
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id = anID.trim();
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title = aTitle.trim();
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year = Integer.parseInt(aYear.trim());
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genres = theGenres;
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director = aDirector;
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country = aCountry;
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poster = aPoster;
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minutes = theMinutes;
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}
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// Returns ID associated with this item
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public String getID () {
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return id;
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}
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// Returns title of this item
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public String getTitle () {
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return title;
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}
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// Returns year in which this item was published
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public int getYear () {
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return year;
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}
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// Returns genres associated with this item
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public String getGenres () {
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return genres;
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}
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public String getCountry(){
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return country;
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}
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public String getDirector(){
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return director;
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}
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public String getPoster(){
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return poster;
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}
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public int getMinutes(){
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return minutes;
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}
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// Returns a string of the item's information
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public String toString () {
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String result = "Movie [id=" + id + ", title=" + title + ", year=" + year;
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result += ", genres= " + genres + "]";
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return result;
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}
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}

‎Week 3/Assignment 1/MovieRunnerAverage.class

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‎Week 3/Assignment 1/MovieRunnerAverage.ctxt

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#BlueJ class context
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comment0.target=MovieRunnerAverage
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comment1.params=
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comment1.target=void\ printAverageRatings()
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comment2.params=
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comment2.target=void\ getAverageRatingOneMovie()
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numComments=3

‎Week 3/Assignment 1/MovieRunnerAverage.java

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/**
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* MovieRunnerAverage class contains tests for the getAverageRatings method from the
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* secondRatings class.
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*
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* @ Konstantin Krumin
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* @ Version: 1.0 (February 18, 2020)
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*/
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import java.util.*;
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public class MovieRunnerAverage {
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public void printAverageRatings () {
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SecondRatings secondRatings = new SecondRatings ("ratedmoviesfull", "ratings");
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System.out.println("Total number of movies : " + secondRatings.getMovieSize());
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System.out.println("Total number of raters : " + secondRatings.getRaterSize());
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int MinNumOfRatings = 20; // variable
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ArrayList<Rating> averageRatings = secondRatings.getAverageRatings(MinNumOfRatings);
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Collections.sort(averageRatings);
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for (Rating rating : averageRatings) {
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System.out.println(rating.getValue() + " " + secondRatings.getTitle(rating.getItem()));
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}
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System.out.println("There are " + averageRatings.size() + " movies with " +
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MinNumOfRatings + " or more ratings");
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}
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public void getAverageRatingOneMovie () {
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SecondRatings secondRatings = new SecondRatings ("ratedmoviesfull", "ratings");
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String title = "Vacation"; // variable
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int MinNumOfRatings = 1; // variable
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String movieID = secondRatings.getID(title);
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ArrayList<Rating> averageRatings = secondRatings.getAverageRatings(MinNumOfRatings);
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for (Rating rating : averageRatings) {
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if (rating.getItem().equals(movieID)) {
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System.out.println("For movie \"" + title + "\" the average rating is "
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+ rating.getValue());
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}
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}
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}
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}

‎Week 3/Assignment 1/PlainRater.class

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‎Week 3/Assignment 1/PlainRater.ctxt

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#BlueJ class context
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comment0.target=PlainRater
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comment1.params=id
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comment1.target=PlainRater(java.lang.String)
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comment2.params=item\ rating
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comment2.target=void\ addRating(java.lang.String,\ double)
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comment3.params=item
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comment3.target=boolean\ hasRating(java.lang.String)
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comment4.params=
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comment4.target=java.lang.String\ getID()
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comment5.params=item
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comment5.target=double\ getRating(java.lang.String)
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comment6.params=
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comment6.target=int\ numRatings()
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comment7.params=
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comment7.target=java.util.ArrayList\ getItemsRated()
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numComments=8

‎Week 3/Assignment 1/PlainRater.java

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/**
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* PlainRater class contains various methods that are used to add and extract ratings information.
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*
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*/
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import java.util.*;
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public class PlainRater implements Rater {
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private String myID;
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private ArrayList<Rating> myRatings;
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public PlainRater(String id) {
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myID = id;
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myRatings = new ArrayList<Rating>();
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}
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public void addRating(String item, double rating) {
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myRatings.add(new Rating(item,rating));
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}
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public boolean hasRating(String item) {
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for(int k=0; k < myRatings.size(); k++){
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if (myRatings.get(k).getItem().equals(item)){
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return true;
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}
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}
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return false;
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}
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public String getID() {
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return myID;
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}
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public double getRating(String item) {
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for(int k=0; k < myRatings.size(); k++){
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if (myRatings.get(k).getItem().equals(item)){
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return myRatings.get(k).getValue();
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}
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}
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return -1;
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}
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public int numRatings() {
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return myRatings.size();
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}
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public ArrayList<String> getItemsRated() {
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ArrayList<String> list = new ArrayList<String>();
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for(int k=0; k < myRatings.size(); k++){
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list.add(myRatings.get(k).getItem());
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}
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return list;
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}
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}

‎Week 3/Assignment 1/Rater.class

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