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feat(08-btrbooks): Добавлено задание

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This commit is contained in:
Mark Zheleznyakov
2024-12-04 13:40:14 +03:00
parent e9d0a4747e
commit b145a859c0
22 changed files with 927 additions and 0 deletions
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48
labs/08-btrbooks/app/build.gradle.kts Normal file
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/*
* This file was generated by the Gradle 'init' task.
*
* This generated file contains a sample Java application project to get you started.
* For more details on building Java & JVM projects, please refer to https://docs.gradle.org/8.10.2/userguide/building_java_projects.html in the Gradle documentation.
*/
plugins {
// Apply the application plugin to add support for building a CLI application in Java.
application
}
repositories {
// Use Maven Central for resolving dependencies.
mavenCentral()
}
dependencies {
// Use JUnit Jupiter for testing.
testImplementation(libs.junit.jupiter)
testRuntimeOnly("org.junit.platform:junit-platform-launcher")
// This dependency is used by the application.
implementation(libs.guava)
}
// Apply a specific Java toolchain to ease working on different environments.
java {
toolchain {
languageVersion = JavaLanguageVersion.of(23)
}
}
application {
// Define the main class for the application.
mainClass = "ru.mrqiz.btrbooks.App"
}
tasks.named<Test>("test") {
// Use JUnit Platform for unit tests.
useJUnitPlatform()
}
tasks.named<JavaExec>("run") {
standardInput = System.`in`
}

25
labs/08-btrbooks/app/src/main/java/ru/mrqiz/btrbooks/App.java Normal file
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package ru.mrqiz.btrbooks;
import java.util.Map;
public class App {
public static void main(String[] args) {
if (args.length < 1) {
System.out.println("hmm noo filename go touch grass");
return;
}
String filename = args[0];
BooksParser parser = new BooksParser();
Books books = parser.read(filename);
if (books == null || books.getBookList().isEmpty()) {
System.out.println("hmm nothing in the books.. go read some");
return;
}
CLI cli = new CLI(books);
cli.start();
}
}

65
labs/08-btrbooks/app/src/main/java/ru/mrqiz/btrbooks/Book.java Normal file
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package ru.mrqiz.btrbooks;
public class Book {
private String author;
private String name;
private int year;
private int id;
private int price;
public Book() {}
public Book(String author, String name, int year, int id) {
this.author = author;
this.name = name;
this.year = year;
this.id = id;
this.price = price;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getYear() {
return year;
}
public void setYear(int year) {
this.year = year;
}
public int getPrice() {
return price;
}
public void setPrice(int price) {
this.price = price;
}
@Override
public String toString() {
return "ID: " + id + ", Author: " + author + ", Name: " + name + ", Year: " + year;
}
}

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labs/08-btrbooks/app/src/main/java/ru/mrqiz/btrbooks/Books.java Normal file
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package ru.mrqiz.btrbooks;
import java.util.ArrayList;
import java.util.List;
public class Books {
private List<Book> bookList;
public Books() {
this.bookList = new ArrayList<>();
}
public List<Book> getBookList() {
return bookList;
}
public void setBookList(List<Book> bookList) {
this.bookList = bookList;
}
@Override
public String toString() {
return "Books{" +
"bookList=" + bookList +
'}';
}
public String toJson() {
StringBuilder jsonBuilder = new StringBuilder();
jsonBuilder.append("[");
for (int i = 0; i < bookList.size(); i++) {
Book book = bookList.get(i);
jsonBuilder.append("{");
jsonBuilder.append("\"id\": ").append(book.getId()).append(", ");
jsonBuilder.append("\"author\": \"").append(book.getAuthor()).append("\", ");
jsonBuilder.append("\"name\": \"").append(book.getName()).append("\", ");
jsonBuilder.append("\"year\": ").append(book.getYear()).append(", ");
jsonBuilder.append("\"price\": ").append(book.getPrice());
jsonBuilder.append("}");
if (i < bookList.size() - 1) {
jsonBuilder.append(", ");
}
}
jsonBuilder.append("]");
jsonBuilder.append("");
return jsonBuilder.toString();
}
public String toCsv() {
StringBuilder csvBuilder = new StringBuilder();
csvBuilder.append("ID,Author,Name,Year,Price\n");
for (Book book : bookList) {
csvBuilder.append(book.getId()).append(",")
.append(book.getAuthor()).append(",")
.append(book.getName()).append(",")
.append(book.getYear()).append(",")
.append(book.getPrice()).append("\n");
}
return csvBuilder.toString();
}
}

73
labs/08-btrbooks/app/src/main/java/ru/mrqiz/btrbooks/BooksParser.java Normal file
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package ru.mrqiz.btrbooks;
import java.util.ArrayList;
import java.util.List;
import java.io.*;
public class BooksParser {
public Books read(String filename) {
StringBuilder content = new StringBuilder();
try (BufferedReader br = new BufferedReader(new FileReader(filename))) {
String line;
while ((line = br.readLine()) != null) {
content.append(line).append(System.lineSeparator());
}
} catch (IOException e) {
e.printStackTrace();
}
String fileContent = content.toString();
return parseBooks(fileContent);
}
private Books parseBooks(String json) {
Books books = new Books();
String[] bookEntries = json.split("\\},\\{");
for (String entry : bookEntries) {
entry = entry.replaceAll("\\{\\}|\\$\\$\\$|\"", "").trim();
String[] fields = entry.split(",");
String author = null;
String name = null;
int year = 0;
int id = 0;
int price = 0;
for (String field : fields) {
String[] keyValue = field.replaceAll("\\[\\{", "").replaceAll("\\}\\]", "").split(":");
if (keyValue.length == 2) {
String key = keyValue[0].trim();
String value = keyValue[1].trim();
switch (key) {
case "author":
author = value;
break;
case "name":
name = value;
break;
case "year":
year = Integer.parseInt(value.replaceAll("\\D+", ""));
break;
case "id":
id = Integer.parseInt(value.replaceAll("\\D+", ""));
break;
case "price":
price = Integer.parseInt(value.replaceAll("\\D+", ""));
break;
}
}
}
Book book = new Book(author, name, year, id);
book.setPrice(price);
books.getBookList().add(book);
}
return books;
}
}

31
labs/08-btrbooks/app/src/main/java/ru/mrqiz/btrbooks/BooksSaver.java Normal file
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package ru.mrqiz.btrbooks;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.io.IOException;
public class BooksSaver {
public static void saveToFile(String filename, Books books, String fmt) {
String content = convert(books, fmt);
Path path = Paths.get(filename);
try {
Files.write(path, content.getBytes());
System.out.println("ok.");
} catch (IOException e) {
e.printStackTrace();
}
}
private static String convert(Books books, String fmt) {
switch (fmt.toLowerCase()) {
case "json":
return books.toJson();
case "csv":
return books.toCsv();
default:
throw new IllegalArgumentException("idk.." + fmt);
}
}
}

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labs/08-btrbooks/app/src/main/java/ru/mrqiz/btrbooks/CLI.java Normal file
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package ru.mrqiz.btrbooks;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;
public class CLI {
private final Books books;
private final Scanner scanner;
private final Map<String, CLICommand> commands;
public CLI(Books books) {
this.books = books;
this.scanner = new Scanner(System.in);
this.commands = new HashMap<>();
initializeCommands();
}
private void initializeCommands() {
commands.put("ls", new DisplayAllBooks());
commands.put("rm", new DeleteBook(scanner));
commands.put("save", new SaveBooks(scanner));
commands.put("edit", new EditBook(scanner));
commands.put("ggwp", null);
}
public void start() {
while (true) {
System.out.println("\npick one:");
commands.keySet().forEach(key -> System.out.println(key));
System.out.print("> ");
String choice = scanner.nextLine().trim().toLowerCase();
if (choice == "ggwp") {
System.out.println("kthxbye..");
return;
}
CLICommand command = commands.get(choice);
if (command != null) {
command.execute(books);
} else {
System.out.println("what the command..");
}
}
}
}

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labs/08-btrbooks/app/src/main/java/ru/mrqiz/btrbooks/CLICommand.java Normal file
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package ru.mrqiz.btrbooks;
public interface CLICommand {
void execute(Books books);
}

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labs/08-btrbooks/app/src/main/java/ru/mrqiz/btrbooks/DeleteBook.java Normal file
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package ru.mrqiz.btrbooks;
import java.util.List;
import java.util.Scanner;
public class DeleteBook implements CLICommand {
private final Scanner scanner;
public DeleteBook(Scanner scanner) {
this.scanner = scanner;
}
@Override
public void execute(Books books) {
System.out.println("gimme id:");
String input = scanner.nextLine();
List<Book> bookList = books.getBookList();
Book bookToDelete = bookList.stream()
.filter(book -> String.valueOf(book.getId()).equals(input))
.findFirst()
.orElse(null);
if (bookToDelete != null) {
bookList.remove(bookToDelete);
System.out.println("cancelled " + input + " in xwitter");
} else {
System.out.println("no book found - id=" + input);
}
}
}

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labs/08-btrbooks/app/src/main/java/ru/mrqiz/btrbooks/DisplayAllBooks.java Normal file
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package ru.mrqiz.btrbooks;
import java.util.stream.Stream;
public class DisplayAllBooks implements CLICommand {
@Override
public void execute(Books books) {
books.getBookList().stream().forEach(System.out::println);
}
}

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labs/08-btrbooks/app/src/main/java/ru/mrqiz/btrbooks/EditBook.java Normal file
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package ru.mrqiz.btrbooks;
import java.util.List;
import java.util.Scanner;
public class EditBook implements CLICommand {
private final Scanner scanner;
public EditBook(Scanner scanner) {
this.scanner = scanner;
}
@Override
public void execute(Books books) {
System.out.println("id?");
String input = scanner.nextLine();
List<Book> bookList = books.getBookList();
Book bookToEdit = bookList.stream()
.filter(book -> String.valueOf(book.getId()).equals(input))
.findFirst()
.orElse(null);
if (bookToEdit != null) {
System.out.println("k got the " + bookToEdit);
System.out.println("author? (leave blank to keep current):");
String newAuthor = scanner.nextLine();
if (!newAuthor.isEmpty()) {
bookToEdit.setAuthor(newAuthor);
}
System.out.println("name? (leave blank to keep current):");
String newName = scanner.nextLine();
if (!newName.isEmpty()) {
bookToEdit.setName(newName);
}
int newYear = bookToEdit.getYear();
System.out.println("year? (leave blank to keep current):");
String yearInput = scanner.nextLine();
if (!yearInput.isEmpty()) {
while (!isValidYear(yearInput)) {
System.out.println("thats not a year.. gimme year:");
yearInput = scanner.nextLine();
}
newYear = Integer.parseInt(yearInput);
}
bookToEdit.setYear(newYear);
int newPrice = bookToEdit.getPrice();
System.out.println("price? (leave blank to keep current):");
String priceInput = scanner.nextLine();
if (!priceInput.isEmpty()) {
while (!isValidPrice(priceInput)) {
System.out.println("thats not a price.. gimme price:");
priceInput = scanner.nextLine();
}
newPrice = Integer.parseInt(priceInput);
}
bookToEdit.setPrice(newPrice);
System.out.println("k saved!");
} else {
System.out.println("umm got no book id=" + input);
}
}
private boolean isValidYear(String input) {
return input.matches("^(19|20)\\d{2}$");
}
private boolean isValidPrice(String input) {
return input.matches("^\\d+(\\.\\d{1,2})?$");
}
}

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labs/08-btrbooks/app/src/main/java/ru/mrqiz/btrbooks/SaveBooks.java Normal file
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package ru.mrqiz.btrbooks;
import java.util.List;
import java.util.Scanner;
public class SaveBooks implements CLICommand {
private final Scanner scanner;
public SaveBooks(Scanner scanner) {
this.scanner = scanner;
}
@Override
public void execute(Books books) {
System.out.println("gimme format:");
String fmt = scanner.nextLine();
System.out.println("gimme path:");
String path = scanner.nextLine();
List<Book> bookList = books.getBookList();
try {
(new BooksSaver()).saveToFile(path, books, fmt);
} catch (Exception e) {
e.printStackTrace();
}
}
}