Merge pull request #16 from ahmedsiam0/add-review-functionality

Add reviewing functionality

src/main/java/com/asu/librarysystem/Library.java

@@ -9,6 +9,7 @@ public class Library
     protected static ArrayList<Borrower> borrowers = new ArrayList();
     private static Account activeAccount;
     private static Admin admin ;
+    private ReviewHandler reviewHandler;
 
     //########################## Start for book #########################//
     public static void addBook(Book book) {
@@ -257,4 +258,8 @@ public static boolean logInByphoneNumber(String phoneNumber, String password){
         }
         return false;
     }
+
+    ReviewHandler getReviewHandler() {
+        return reviewHandler;
+    }
 }

src/main/java/com/asu/librarysystem/MainApplication.java

@@ -46,8 +46,21 @@ public static void main(String[] args) {
 
         System.out.println(b.get(2));
 
+        // Testing Cover
         Book book = new Book("The Old Man And The Sea", "Ernest Hemingway", 1952, true, 200, 0, "book-covers/the_old_man_and_the_sea.jpg");
         System.out.println(book.getCoverPath());
 
+        // Testing ReviewHandler
+        ReviewHandler reviewHandler = new ReviewHandler();
+        reviewHandler.addReview(1, 1, 1, "Nice Book");
+        reviewHandler.addReview(2, 1, 1, "");
+        reviewHandler.addReview(3, 1, 1, "");
+        reviewHandler.addReview(4, 1, 1, "");
+        reviewHandler.addReview(5, 1, 1, "Bad Book");
+        reviewHandler.deleteReview(3, 1);
+        ArrayList<Integer> ratings = reviewHandler.getBookRatings(1);
+        System.out.println(ratings.get(1));
+        System.out.println(reviewHandler.getReviewText(1, 1));
+        System.out.println(reviewHandler.getReviewText(5, 1));
     }
 }

src/main/java/com/asu/librarysystem/Review.java

@@ -0,0 +1,51 @@
+package com.asu.librarysystem;
+
+public class Review {
+    private static int idCounter = 0;
+    private final int id;
+    private int reviewerId;
+    private int bookId;
+    private int rating;
+    private String text;
+
+    public Review(int reviewerId, int bookId, int rating, String text) {
+        id = ++idCounter;
+        this.reviewerId = reviewerId;
+        this.bookId = bookId;
+        setRating(rating);
+        this.text = text;
+    }
+    public Review(Review review) {
+        this.id = review.id;
+        this.reviewerId = review.reviewerId;
+        this.bookId = review.bookId;
+        this.rating = review.rating;
+        this.text = review.text;
+    }
+    public void setRating(int rating) {
+        if (rating > 5)
+            this.rating = 5;
+        else if (rating < 1)
+            this.rating = 1;
+        else
+            this.rating = rating;
+    }
+    public int getRating() {
+        return rating;
+    }
+    public int getId() {
+        return id;
+    }
+    public int getBookId() {
+        return bookId;
+    }
+    public int getReviewerId() {
+        return reviewerId;
+    }
+    public String getText() {
+        return text;
+    }
+    public void setText(String text) {
+        this.text = text;
+    }
+}

src/main/java/com/asu/librarysystem/ReviewHandler.java

@@ -0,0 +1,98 @@
+package com.asu.librarysystem;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+
+public class ReviewHandler {
+    private ArrayList<Review> reviews;
+    private HashMap<Integer, ArrayList<Integer>> bookRatings;
+
+    public ReviewHandler() {
+        reviews = new ArrayList<Review>();
+        bookRatings = new HashMap<Integer, ArrayList<Integer>>();
+    }
+
+    public void addReview(int reviewerId, int bookId, int rating, String text) {
+        Review review = findReview(reviewerId, bookId);
+        if (review.getReviewerId() != -1) {
+            updateReview(reviewerId, bookId, rating, text);
+            return;
+        }
+        review = new Review(reviewerId, bookId, rating, text);
+
+        reviews.add(review);
+        if (!bookRatings.containsKey(bookId)) {
+            bookRatings.put(bookId, new ArrayList<Integer>());
+            for (int i = 0; i < 6; i++)
+                bookRatings.get(bookId).add(0);
+        }
+        addBookRating(bookId, review.getRating());
+    }
+
+    public void updateReview(int reviewerId, int bookId, int rating, String text) {
+        Review review = findReview(reviewerId, bookId);
+        if (review.getRating() != rating) {
+            removeBookRating(bookId, review.getRating());
+            review.setRating(rating);
+            addBookRating(bookId, review.getRating());
+        }
+        if (!review.getText().equals(text)) {
+            review.setText(text);
+        }
+    }
+    public void deleteReview(int reviewerId, int bookId) {
+        int index = findReviewIndex(reviewerId, bookId);
+        if (index == -1)
+            return;
+        Review review = reviews.get(index);
+        removeBookRating(bookId, review.getRating());
+        reviews.remove(index);
+    }
+    public ArrayList<Review> getBookReviews(int bookId) {
+        ArrayList<Review> bookReviews = new ArrayList<Review>();
+
+        for (int i = 0; i < reviews.size(); i++) {
+            if (reviews.get(i).getBookId() == bookId) {
+                bookReviews.add(new Review(reviews.get(i)));
+            }
+        }
+
+        return bookReviews;
+    }
+
+    public ArrayList<Integer> getBookRatings(int bookId) {
+        return bookRatings.get(bookId);
+    }
+
+    public String getReviewText(int reviewerId, int bookId) {
+        return (new String(findReview(reviewerId, bookId).getText()));
+    }
+
+    public int getReviewRating(int reviewerId, int bookId) {
+        return findReview(reviewerId, bookId).getRating();
+    }
+
+    private void addBookRating(int bookId, int rating) {
+        Integer number = bookRatings.get(bookId).get(rating);
+        bookRatings.get(bookId).set(rating, number + 1);
+    }
+    private void removeBookRating(int bookId, int rating) {
+        Integer number = bookRatings.get(bookId).get(rating);
+        bookRatings.get(bookId).set(rating, number - 1);
+    }
+    private int findReviewIndex(int reviewerId, int bookId) {
+        for (int i = 0; i < reviews.size(); i++) {
+            if (reviews.get(i).getReviewerId() == reviewerId && reviews.get(i).getBookId() == bookId) {
+                return i;
+            }
+        }
+        return -1;
+    }
+    private Review findReview(int reviewerId, int bookId) {
+        int index = findReviewIndex(reviewerId, bookId);
+        if (index == -1)
+            return (new Review(-1, -1, -1, ""));
+        else
+            return reviews.get(index);
+    }
+}