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BookManagement.java
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BookManagement.java
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package com.library.management;
import com.library.component.Book;
import com.library.component.Dictionary;
import com.library.component.EducationBook;
import com.library.component.ReferenceBook;
import com.library.util.Day;
import java.io.*;
import java.util.Arrays;
import java.util.Scanner;
public class BookManagement implements Management, File {
private Book[] books;
private static String bookMenu = """
1. Education Book
2. Reference Book
3. Dictionary
""";
public BookManagement() {
this.books = new Book[0];
}
public Book[] getBooks() {
return books;
}
public void setBooks(Book[] books) {
this.books = books;
}
public boolean idExists(int id) {
for (Book book : books)
if (book.getStatus().equals("enabled") && id == book.getId())
return true;
return false;
}
@Override
public void input() {
Scanner sc = new Scanner(System.in);
String choice, input;
int n = 0;
boolean hasError;
do {
System.out.println("""
Inputting books will overwrite all of the books.
All existing books will be lost.
\tDo you want to continue?
1. Yes
2. No
""");
System.out.print("Enter your choice: ");
choice = sc.nextLine();
if (choice.equals("1"))
break;
if (choice.equals("2"))
return;
} while (true);
do {
hasError = false;
System.out.print("Enter number of books: ");
input = sc.nextLine();
try {
n = Integer.parseInt(input);
} catch (Exception e) {
hasError = true;
}
} while (hasError || n < 0);
Book[] newBooks = new Book[n];
books = new Book[0];
for (int i = 0; i < n; i++) {
do {
newBooks[i] = null;
System.out.println("\t\t\tBOOK " + (i + 1));
System.out.println(bookMenu);
System.out.print("Enter your choice: ");
choice = sc.nextLine();
if (choice.equals("1"))
newBooks[i] = new EducationBook();
if (choice.equals("2"))
newBooks[i] = new ReferenceBook();
if (choice.equals("3"))
newBooks[i] = new Dictionary();
} while (newBooks[i] == null);
newBooks[i].input();
books = Arrays.copyOf(books, books.length + 1);
books[i] = newBooks[i];
}
writeFile(books, false);
}
@Override
public void output() {
boolean hasBooks = false;
for (Book book : books) {
if (book.getStatus().equals("enabled")) {
hasBooks = true;
break;
}
}
if (!hasBooks) {
System.out.println("There are no books yet.");
return;
}
System.out.printf(" ID %15s NAME %13s REMAIN PRICE %4s PUBLISH DAY %14s NOTE\n", "", "", "", "");
for (Book book : books)
if (book.getStatus().equals("enabled"))
book.output();
}
@Override
public void add() {
Scanner sc = new Scanner(System.in);
String choice, input;
int k = 0, n = books.length;
boolean hasError;
do {
hasError = false;
System.out.print("Enter number of books: ");
input = sc.nextLine();
try {
k = Integer.parseInt(input);
} catch (Exception e) {
hasError = true;
}
} while (hasError || k < 0);
Book[] newBooks = new Book[k];
for (int i = 0; i < k; i++) {
do {
newBooks[i] = null;
System.out.println("\t\t\tBOOK " + (i + 1));
System.out.println(bookMenu);
System.out.print("Enter your choice: ");
choice = sc.nextLine();
if (choice.equals("1"))
newBooks[i] = new EducationBook();
if (choice.equals("2"))
newBooks[i] = new ReferenceBook();
if (choice.equals("3"))
newBooks[i] = new Dictionary();
} while (newBooks[i] == null);
newBooks[i].input();
books = Arrays.copyOf(books, books.length + 1);
books[i + n] = newBooks[i];
}
writeFile(newBooks, true);
}
@Override
public void edit() {
Scanner sc = new Scanner(System.in);
int id = Book.inputId("Enter ID (4 digits): ");
Book book = findBook(id);
if (book == null)
System.out.println("Book not found!");
else {
System.out.printf(" ID %15s NAME %13s REMAIN PRICE %4s PUBLISH DAY %14s NOTE\n", "", "", "", "");
book.output();
do {
System.out.println("""
\n\tEdit?
1. Yes
2. No
""");
System.out.print("Enter your choice: ");
String choice = sc.nextLine();
if (choice.equals("1")) {
book.setId(0); // reset ID to be able to edit ID
book.input();
System.out.println("Book edited!");
writeFile(books, false);
break;
}
if (choice.equals("2"))
break;
} while (true);
}
}
@Override
public void remove() {
Scanner sc = new Scanner(System.in);
int id = Book.inputId("Enter ID (4 digits): ");
Book book = findBook(id);
if (book == null)
System.out.println("Book not found!");
else {
System.out.printf(" ID %15s NAME %13s REMAIN PRICE %4s PUBLISH DAY %14s NOTE\n", "", "", "", "");
book.output();
do {
System.out.println("""
\n\tRemove?
1. Yes
2. No
""");
System.out.print("Enter your choice: ");
String choice = sc.nextLine();
if (choice.equals("1")) {
book.setStatus("disabled");
System.out.println("Book removed!");
writeFile(books, false);
break;
}
if (choice.equals("2"))
break;
} while (true);
}
}
@Override
public void find() {
Scanner sc = new Scanner(System.in);
String choice;
Book[] book = new Book[1];
do {
System.out.println("""
1. Find Book by ID.
2. Find Book by name.
3. Find Book between low price and high price
""");
System.out.print("Enter your choice: ");
choice = sc.nextLine();
if (choice.equals("1")) { // Find Book by ID
int id = Book.inputId("Enter ID (4 digits): ");
book[0] = findBook(id);
break;
}
if (choice.equals("2")) { // Find Book by name
String name = Book.inputName("Enter name: ");
book[0] = findBook(name);
break;
}
if (choice.equals("3")) { // Find Book between prices
double low = Book.inputPrice("Enter low price: ");
double high = Book.inputPrice("Enter high price: ");
book = findBook(low, high);
break;
}
} while (true);
if (book.length == 0 || book[0] == null) // if (find between prices not found || find by ID/name not found)
System.out.println("Book not found!");
else {
System.out.printf(" ID %17s NAME %15s REMAIN PRICE %6s PUBLISH DAY %16s NOTE\n", "", "", "", "");
for (Book b : book)
b.output();
}
}
public Book findBook(int id) {
for (Book book : books)
if (book.getStatus().equals("enabled") && book.getId() == id)
return book;
return null;
}
public Book findBook(String name) {
for (Book book : books)
if (book.getStatus().equals("enabled") && book.getName().equalsIgnoreCase(name))
return book;
return null;
}
public Book[] findBook(double low, double high) {
Book[] booksFound = new Book[0];
for (Book book : books) {
if (book.getStatus().equals("enabled") && book.getPrice() >= low && book.getPrice() <= high) {
booksFound = Arrays.copyOf(booksFound, booksFound.length + 1);
booksFound[booksFound.length - 1] = book; // if found, add the book to array
}
}
return booksFound;
}
@Override
public void statistic() {
/*
Thống kê số lượng sách theo từng thể loại
Tính phần trăm số lượng mỗi thể loại so với tổng số lượng sách
*/
int n = 0;
int edu = 0, eduRemain = 0;
int ref = 0, refRemain = 0;
int dic = 0, dicRemain = 0;
int all = 0, remain;
for (Book book : books) {
if (book.getStatus().equals("disabled"))
continue;
n++;
remain = book.getRemain();
if (book instanceof EducationBook) {
edu++;
eduRemain += remain;
}
if (book instanceof ReferenceBook) {
ref++;
refRemain += remain;
}
if (book instanceof Dictionary) {
dic++;
dicRemain += remain;
}
all += remain;
}
System.out.printf("Number of books: %d\n", n);
System.out.printf("Education books: %d\t--> %.2f%%\n", edu, edu * 100.0 / n);
System.out.printf("Reference books: %d\t--> %.2f%%\n", ref, ref * 100.0 / n);
System.out.printf(" Dictionaries: %d\t--> %.2f%%\n", dic, dic * 100.0 / n);
System.out.printf("\nNumber of remain books: %d\n", all);
System.out.printf("Remain education books: %d\t--> %.2f%%\n", eduRemain, eduRemain * 100.0 / all);
System.out.printf("Remain reference books: %d\t--> %.2f%%\n", refRemain, refRemain * 100.0 / all);
System.out.printf(" Remain dictionaries: %d\t--> %.2f%%\n", dicRemain, dicRemain * 100.0 / all);
}
@Override
public void readFile() {
try {
FileReader file = new FileReader("data\\books.txt");
BufferedReader reader = new BufferedReader(file);
String strLine;
while ((strLine = reader.readLine()) != null)
convertToObject(strLine);
reader.close();
} catch (Exception ignored) {}
}
@Override
public void writeFile(Object[] objects, boolean append) {
try {
FileWriter file = new FileWriter("data\\books.txt", append);
BufferedWriter writer = new BufferedWriter(file);
for (Object book : objects)
writer.write(book.toString() + "\n");
writer.close();
} catch (Exception ignored) {}
}
@Override
public void convertToObject(String line) throws Exception {
String[] object = line.split(", ");
Book book = null;
String status = object[1];
int id = Integer.parseInt(object[2]);
String name = object[3];
int remain = Integer.parseInt(object[4]);
double price = Double.parseDouble(object[5]);
Day publishDay = Day.parseDay(object[6]);
if (object[0].equals("EDU")) {
String publisher = object[7];
book = new EducationBook(status, id, name, remain, price, publishDay, publisher);
}
if (object[0].equals("REF")) {
String author = object[7];
book = new ReferenceBook(status, id, name, remain, price, publishDay, author);
}
if (object[0].equals("DIC")) {
String language = object[7];
book = new Dictionary(status, id, name, remain, price, publishDay, language);
}
books = Arrays.copyOf(books, books.length + 1);
books[books.length - 1] = book;
}
}