Walden

public class APIResponseParser {

    /**
     * Parses the input text and returns a Book instance containing
     * the parsed data.
     * @param response text to be parsed
     * @return Book instance containing parsed data
     */
    public static Book parse(String response) {
        // -- Start: Provided by instructor --
        Book book = new Book();
        String endRule = "<";

        String startRule = "<title>";

        APIResponseParser arp = new APIResponseParser();
        String title = arp.parse(response, startRule, endRule);
        book.setTitle(title);
        // -- End: Provided by instructor --

        startRule = "<name>";
        String name = arp.parse(response, startRule, endRule);
        book.setAuthor(name);

        startRule = "<original_publication_year type=\"integer\">";
        String publicationYear = arp.parse(response, startRule, endRule);
        book.setPublicationYear(new Integer(publicationYear));

        startRule = "<average_rating>";
        String averageRating = arp.parse(response, startRule, endRule);
        book.setAverageRating(new Double(averageRating));

        startRule = "<ratings_count type=\"integer\">";
        String ratingsCount = arp.parse(response, startRule, endRule);
        book.setRatingsCount(new Integer(ratingsCount.replaceAll(",", "")));

        startRule = "<image_url>";
        String imageUrl = arp.parse(response, startRule, endRule);
        book.setImageUrl(imageUrl);

        return book;
    }

    private String parse(String response, String startRule, String endRule) {
        int pos = response.indexOf(startRule);
        int start = pos + startRule.length();
        int end = response.indexOf(endRule, start);

        return response.substring(start, end);
    }

    // write overloaded parse method with the 3 parameters response, startRule, endRule
    public static void main(String[] args) {
        String response = "<work>" +
                                "<id type=\"integer\">2361393</id>" +
                                "<books_count type=\"integer\">813</books_count>" +
                                "<ratings_count type=\"integer\">1,16,315</ratings_count>" +
                                "<text_reviews_count type=\"integer\">3439</text_reviews_count>" +
                                "<original_publication_year type=\"integer\">1854</original_publication_year>" +
                                "<original_publication_month type=\"integer\" nil=\"true\"/>" +
                                "<original_publication_day type=\"integer\" nil=\"true\"/>" +
                                "<average_rating>3.79</average_rating>" +
                                "<best_book type=\"Book\">" +
                                    "<id type=\"integer\">16902</id>" +
                                    "<title>Walden</title>" +
                                    "<author>" +
                                        "<id type=\"integer\">10264</id>" +
                                        "<name>Henry David Thoreau</name>" +
                                    "</author>" +
                                    "<image_url>" +
                                        "http://images.gr-assets.com/books/1465675526m/16902.jpg" +
                                    "</image_url>" +
                                    "<small_image_url>" +
                                        "http://images.gr-assets.com/books/1465675526s/16902.jpg" +
                                    "</small_image_url>" +
                                "</best_book>" +
                            "</work>";

        Book book = APIResponseParser.parse(response);

        out.println(book.getAuthor());
        out.println(book.getTitle());
        out.println(book.getAverageRating());
        out.println(book.getImageUrl());
    }
}