Library.java

The Library constructor will simply store the given books and patrons arrays in the object. There is no need to make copies of these arrays.

The checkin method will check in a book upon return. If the returned book belongs in the Library, and it is currently checked out, this method should update the status of the book, reset its patron and due date, determine the fine for this book (if any), and update the patron's balance. The return value indicates success or failure. For example, if the book is not in the library, checkin should return false.

The checkout method will let a patron checkout a book that is available in the Library. If both the patron and the book belong to the library, and the book is available, this method will update the book's status and patron, and set the due date to ten days from today's date. The return value indicates success or failure. For example, if the book is not in the library, checkout should return false.

The determineFine method will compute the fine currently due for a book that is checked out. For this method, the fine rate is $0.50 per day for each day after the due date.

The searchBooks method searches for books, depending on the key and type, and returns an array of the books found. If no books are found, the resulting array will have a length of zero.

When type is TITLE_SEARCH, key will be a string containing the title to search. The method should return all books with that title.

When type is AUTHOR_SEARCH, key will be a String containing the author's name. The method should return all books for that author.

When type is PATRON_SEARCH, key will either be a Patron object or an Integer with the Patron's id. The method should return all books checked out to that patron.

When type is OVERDUE_SEARCH, key will be a Date object. The method should return all books that will be overdue on that date (if not checked in before then).

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code to test it:

import junit.framework.TestCase; import java.util.Date;

/** * Tests Library: currently one test method. * * @author * @version * */ public class LibraryTest extends TestCase {

/** A single test for Library. **/ public void testLibrary() {

String title = "Starting Out With Java"; String author = "Tony Gaddis"; String isbn = "978-0-13-395705-1"; int year = 2016; int pages = 1188; String title2 = "Starting Out With Java Edition 4"; String author2 = "T. Gaddis"; String isbn2 = "978-0-13-608020-6"; int year2 = 2008; int pages2 = 977; Book b0 = new Book(title2, author2, isbn2, year2, pages2); Book b1 = new Book(title, author, isbn, year, pages); Book b2 = new Book(title, author, isbn, year, pages); Book[] deesBooks = {b0, b1, b2}; Patron p0 = new Patron("Dee A. B. Weikle", "weikleda@jmu.edu", 2, 1.50); Patron p1 = new Patron("Chris Mayfield", "mayfiecs@jmu.edu", 1, 1.00); Patron p2 = new Patron("Alvin Chao", "chaoaj@jmu.edu", 0, 0); Patron[] deesPatrons = {p0, p1, p2}; Library deesLibrary = new Library(deesBooks, deesPatrons); if (deesLibrary.checkout(deesBooks[1], deesPatrons[2])) { assertEquals("Library checkout1:", Book.UNAVAILABLE, deesBooks[1].getStatus()); assertTrue("Library checkout3:", deesPatrons[2].equals(deesBooks[1].getPatron())); assertEquals("Library checkout 4:", 10, DateUtils.interval(new Date(), deesBooks[1].getDue())); if (deesLibrary.checkin(deesBooks[1])) { assertEquals("Library checkout5", Book.AVAILABLE, deesBooks[1].getStatus()); assertEquals("Library checkout6", null, deesBooks[1].getPatron()); assertEquals("Library checkout7", null, deesBooks[1].getDue()); } } else { assertTrue("Library checkout failed", false); } // Test with book not in the library Book b3 = new Book("Title", "Author", "isbn", 2010, 220); assertFalse("Library no book checkout", deesLibrary.checkout(b3, p0)); // Test determine fine, checkout book with overdue date Date today = new Date(); Date tenDaysAgo = DateUtils.addDays(today, -10); b0.checkout(p0, tenDaysAgo); assertEquals("5.00 fine", 5.00, deesLibrary.determineFine(b0)); // Test search books - something there Book[] actual = deesLibrary.searchBooks("Tony Gaddis", Library.AUTHOR_SEARCH); assertEquals("Library author search 2 books:", 2, actual.length); assertTrue("Library author search 2 books, b1", actual[0] == b1 || actual[1] == b1); assertTrue("Library author search 2 books, b2", actual[0] == b2 || actual[1] == b2); Book[] actual2 = deesLibrary.searchBooks(title, Library.TITLE_SEARCH); assertEquals("Library title search 2 books:", 2, actual2.length); assertTrue("Library title search 2 books, b1", actual2[0] == b1 || actual2[1] == b1); assertTrue("Library title search 2 books, b2", actual2[0] == b2 || actual2[1] == b2); Book[] actual3 = deesLibrary.searchBooks(p0, Library.PATRON_SEARCH); assertEquals("Library patron search 2 books:", 1, actual3.length); assertTrue("Library patron search 2 books, b1", actual3[0] == b0); Book[] actual4 = deesLibrary.searchBooks(new Date(), Library.OVERDUE_SEARCH); assertEquals("Library overdue search 2 books:", 1, actual4.length); assertTrue("Library overdue search 2 books, b1", actual4[0] == b0); // Test search books nothing there Book[] actual5 = deesLibrary.searchBooks("Author", Library.AUTHOR_SEARCH); assertEquals("Library author search not there:", 0, actual5.length); Book[] actual6 = deesLibrary.searchBooks("Title", Library.TITLE_SEARCH); assertEquals("Library title search not there:", 0, actual6.length); Book[] actual7 = deesLibrary.searchBooks(p2, Library.PATRON_SEARCH); assertEquals("Library patron search not there:", 0, actual7.length); Date d = new Date(); Book[] actual8 = deesLibrary.searchBooks(DateUtils.addDays(d, -20), Library.OVERDUE_SEARCH); assertEquals("Library overdue search not there:", 0, actual8.length); // Test patron search with int idnumber instead Book[] actual9 = deesLibrary.searchBooks(0, Library.PATRON_SEARCH); assertEquals("Library patron search idnum not there:", 0, actual9.length); Book[] actual10 = deesLibrary.searchBooks(2, Library.PATRON_SEARCH); assertEquals("Library patron search idnum b0", 1, actual10.length); assertTrue("Library patron search idnum b0", actual10[0] == b0); } }

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Book.java

import java.util.Date;

public class Book { public static final int AVAILABLE = 1; public static final int UNAVAILABLE = 2; private String title; private String author; private String isbn; private int pages; private int year; private int status; private Patron patron; private Date due; /** * Constructs a book from the given values. * * @param title the book's title * @param author the book's author (or authors) * @param isbn international standard book number * @param year the book's year of publication * @param pages number of pages in the book */ public Book(String title, String author, String isbn, int year, int pages) { this.title = title; this.author = author; this.isbn = isbn; this.year = year; this.pages = pages; this.status = AVAILABLE; this.patron = null; this.due = null; } /** * @return the title */ public String getTitle() { return title; } /** * @return the author */ public String getAuthor() { return author; } /** * @return the isbn */ public String getIsbn() { return isbn; } /** * @return the pages */ public int getPages() { return pages; } /** * @return the year */ public int getYear() { return year; } /** * @return the status */ public int getStatus() { return status; } /** * @return the due date */ public Date getDue() { return due; } /** * @return the patron */ public Patron getPatron() { return patron; } /** * Checks the book in. */ public void checkin() { this.status = AVAILABLE; this.patron = null; this.due = null; } /** * Checks the book out. * * @param patron the patron checking the book out * @param due when the book is due for return */ public void checkout(Patron patron, Date due) { this.status = UNAVAILABLE; this.patron = patron; this.due = due; } /** * Compares this book to the specified object. * * @param other the object to compare this book against * @return true if the books have the same isbn */ public boolean equals(Object other) { boolean result = false; if (other instanceof Book) { Book book = (Book) other; result = this.isbn.equals(book.isbn); } else if (other instanceof String) { String str = (String) other; result = this.isbn.equals(str); } return result; } /** * @return the basic info of the Book as a String */ public String toString() { String s = "Title: " + title + ", " + "Author: " + author + ", " + "ISBN: " + isbn + ", " + "Year: " + year + ", " + "Pages: " + pages + "."; return s; } }

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/** * Represnts a patron in a library. * * @author * @author * @version */ public class Patron { private String name; private String email; private int idNumber; private double balance; /** * Constructs a Patron from the given values. * * @param name first and last name * @param email patron's email address * @param idNumber library card number * @param balance amount due for patron */ public Patron(String name, String email, int idNumber, double balance) { this.name = name; this.email = email; this.idNumber = idNumber; this.balance = balance; } /** * Increases/decreases balance by the given amount. * * @param amount the fine or payment amount * @return the adjusted balance */ public double adjustBalance(double amount) { this.balance += amount; return this.balance; } /** * Compares this patron to the specified object. * * @param other the object to compare this Patron against * @return true if the patrons have the same id number */ public boolean equals(Object other) { boolean result = false; if (other instanceof Patron) { Patron patron = (Patron) other; result = this.idNumber == patron.idNumber; } else if (other instanceof Integer) { Integer id = (Integer) other; result = this.idNumber == id; } return result; } /** * @return the basic info of the Patron as a String */ public String toString() { return String.format("Name: %s, Email: %s, ID: %d, Balance: $%.2f.", name, email, idNumber, balance); } }

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import java.util.Calendar; import java.util.Date;

/** * Utility methods for java.util.Date objects. * * @author * @author * @version */ public class DateUtils { private static final long MILLIS_PER_DAY = 86400000; /** * Adds a number of days to a date. * * @param date the date (unchanged) * @param days number of days to add * @return the new date */ public static Date addDays(Date date, int days) { Calendar c = Calendar.getInstance(); c.setTime(date); c.add(Calendar.DATE, days); return c.getTime(); } /** * Compute the number of days from the "from" date to the "to" date. * The time fields (hour, minute, second, millisecond) are set to zero * before the calculation is made, so that only the year, month, and day * are used to calculate the difference. * * @param from the date starting the interval * @param to the date ending the interval * @return number of whole days in the interval */ public static int interval(Date from, Date to) { Calendar fromCal = Calendar.getInstance(); fromCal.setTime(from); fromCal.set(Calendar.HOUR, 0); fromCal.set(Calendar.MINUTE, 0); fromCal.set(Calendar.SECOND, 0); fromCal.set(Calendar.MILLISECOND, 0); Calendar toCal = Calendar.getInstance(); toCal.setTime(to); toCal.set(Calendar.HOUR, 0); toCal.set(Calendar.MINUTE, 0); toCal.set(Calendar.SECOND, 0); toCal.set(Calendar.MILLISECOND, 0); long diff = toCal.getTimeInMillis() - fromCal.getTimeInMillis(); return (int) (diff / MILLIS_PER_DAY); } }