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Merge pull request mouredev#6152 from simonguzman/main
#26 - Java #27 - Java
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‎Roadmap/26 - SOLID SRP/java/simonguzman.java

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import java.io.FileWriter;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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public class simonguzman {
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public static void main(String[] args) {
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//incorrectSrp();
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//correctSrp();
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//additionalExerciseNoSrp();
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additionalExerciseSrp();
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}
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/****************************** Ejercicio adicional(Con srp) ******************************/
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public static void additionalExerciseSrp(){
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BookManager bookManager = new BookManager();
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UserManager userManager = new UserManager();
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LoanManager loanManager = new LoanManager();
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bookManager.registerBook("1984", "George Orwell", 3);
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userManager.registerUser("John Doe", "001", "[email protected]");
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User user = userManager.findUserById("001");
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Book book = bookManager.findBookByTitle("1984");
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loanManager.borrowBook(user, book);
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loanManager.returnBook(user, book);
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}
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class BookSrp {
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private String title;
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private String author;
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private int copies;
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public BookSrp(){
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}
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public BookSrp(String title, String author, int copies) {
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this.title = title;
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this.author = author;
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this.copies = copies;
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}
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public String getTitle() {
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return title;
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}
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public int getCopies() {
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return copies;
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}
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public void setCopies(int copies) {
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this.copies = copies;
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}
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}
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class UserSrp {
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private String name;
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private String id;
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private String email;
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public UserSrp(){
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}
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public UserSrp(String name, String id, String email) {
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this.name = name;
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this.id = id;
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this.email = email;
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}
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public String getName() {
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return name;
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}
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public String getId() {
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return id;
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}
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}
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static class BookManager{
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private List<Book> books = new ArrayList<>();
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public void registerBook(String title, String author, int copies){
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books.add(new Book(title, author, copies));
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System.out.println("Libro registrado: " + title);
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}
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public Book findBookByTitle(String title){
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return books.stream().filter(b -> b.getTitle().equals(title)).findFirst().orElse(null);
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}
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}
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static class UserManager{
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private List<User> users = new ArrayList<>();
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public void registerUser(String name, String id, String email){
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users.add(new User(name, id, email));
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System.out.println("Usuario registrado: " + name);
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}
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public User findUserById(String id){
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return users.stream().filter(u -> u.getId().equals(id)).findFirst().orElse(null);
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}
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}
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static class LoanManager{
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private Map<User, List<Book>> borrowedBooks = new HashMap<>();
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public void borrowBook(User user, Book book) {
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if (book != null && book.getCopies() > 0) {
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borrowedBooks.computeIfAbsent(user, k -> new ArrayList<>()).add(book);
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book.setCopies(book.getCopies() - 1);
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System.out.println("Libro prestado: " + book.getTitle() + " a " + user.getName());
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} else {
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System.out.println("No se pudo procesar el préstamo.");
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}
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}
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public void returnBook(User user, Book book) {
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List<Book> borrowed = borrowedBooks.get(user);
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if (borrowed != null && borrowed.contains(book)) {
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borrowed.remove(book);
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book.setCopies(book.getCopies() + 1);
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System.out.println("Libro devuelto: " + book.getTitle());
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} else {
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System.out.println("No se pudo devolver el libro.");
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}
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}
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}
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/****************************** Ejercicio adicional(Sin srp) ******************************/
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public static void additionalExerciseNoSrp(){
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Library library = new Library();
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library.registerBook("1984", "George Orwell", 3);
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library.registerUser("John Doe", "001", "[email protected]");
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library.borrowBook("001", "1984");
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library.returnBook("001", "1984");
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}
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static class Library{
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private List<Book> books = new ArrayList<>();
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private List<User> users = new ArrayList<>();
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private Map<User, List<Book>> borrowedBooks = new HashMap<>();
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public void registerBook(String title, String author, int copies){
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books.add(new Book(title, author, copies));
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System.out.println("Libro registrado: "+title);
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}
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public void registerUser(String name, String id, String email){
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users.add(new User(name, id, email));
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System.out.println("Usuario registrado: "+name);
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}
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public void borrowBook(String userId, String bookTitle){
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User user = users.stream().filter(u -> u.getId().equals(userId)).findFirst().orElse(null);
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Book book = books.stream().filter(b -> b.getTitle().equals(bookTitle)).findFirst().orElse(null);
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if(user != null && book != null && book.getCopies() > 0){
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borrowedBooks.computeIfAbsent(user, k -> new ArrayList<>()).add(book);
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book.setCopies(book.getCopies()-1);
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System.out.println("Libro prestado: " + bookTitle + " a " + user.getName());
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}else{
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System.out.println("No se pudo procesar el prestamo.");
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}
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}
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public void returnBook(String userId, String bookTitle){
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User user = users.stream().filter(u -> u.getId().equals(userId)).findFirst().orElse(null);
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List<Book> borrowed = borrowedBooks.get(user);
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if(borrowed != null){
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Book book = borrowed.stream().filter(b -> b.getTitle().equals(bookTitle)).findFirst().orElse(null);
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if(book != null){
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borrowed.remove(book);
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book.setCopies(book.getCopies() + 1);
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System.out.println("Libro devuelto: "+bookTitle);
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}
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}else{
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System.out.println("ERROR: No se pudo devolver el libro.");
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}
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}
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}
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static class Book{
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private String title;
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private String author;
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private int copies;
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public Book(){
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}
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public Book(String title, String author, int copies){
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this.title = title;
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this.author = author;
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this.copies = copies;
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}
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public String getTitle() {
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return title;
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}
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public int getCopies() {
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return copies;
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}
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public void setCopies(int copies) {
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this.copies = copies;
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}
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}
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static class User{
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private String name;
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private String id;
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private String email;
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public User(){
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}
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public User(String name, String id, String email){
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this.name = name;
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this.id = id;
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this.email = email;
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}
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public String getName() {
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return name;
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}
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public String getId() {
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return id;
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}
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public String getEmail() {
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return email;
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}
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}
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/****************************** ejemplo con srp(Correcto) ******************************/
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public static void correctSrp() {
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InvoiceSrp invoice = new InvoiceSrp("Laptop",2,1200.00);
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InvoicePrinter printer = new InvoicePrinter();
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printer.printInvoice(invoice);
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InvoiceSaver saver = new InvoiceSaver();
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saver.saveToFile(invoice);
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}
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static class InvoiceSrp{
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private String product;
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private int quantity;
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private double price;
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public InvoiceSrp(){
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}
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public InvoiceSrp(String product, int quantity, double price){
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this.product = product;
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this.quantity = quantity;
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this.price = price;
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}
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public double calculateTotal(){
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return quantity * price;
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}
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public String getProduct() {
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return product;
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}
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public int getQuantity() {
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return quantity;
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}
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public double getPrice() {
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return price;
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}
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}
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static class InvoicePrinter {
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public void printInvoice(InvoiceSrp invoice){
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System.out.println("Producto: "+invoice.getProduct());
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System.out.println("Cantidad: "+invoice.getQuantity());
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System.out.println("Precio: "+invoice.getPrice());
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System.out.println("Total: "+invoice.calculateTotal());
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}
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}
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static class InvoiceSaver{
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public void saveToFile(InvoiceSrp invoice){
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try (FileWriter writer = new FileWriter("invoice.txt")){
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writer.write("Producto: " + invoice.getProduct() + "\n");
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writer.write("Cantidad: " + invoice.getQuantity() + "\n");
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writer.write("Precio unitario: " + invoice.getPrice() + "\n");
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writer.write("Total: " + invoice.calculateTotal() + "\n");
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} catch (Exception e) {
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System.out.println("ERROR: no se pudo generar la factura..."+e.getMessage());
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}
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}
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}
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/****************************** ejemplo sin srp(Incorrecto) ******************************/
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public static void incorrectSrp(){
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Invoice invoice = new Invoice("Laptop",2,1200.00);
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invoice.printInvoice();
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invoice.saveToFile();
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}
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static class Invoice{
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private String product;
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private int quantity;
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private double price;
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public Invoice(){
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}
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public Invoice(String product, int quantity, double price){
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this.product = product;
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this.quantity = quantity;
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this.price = price;
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}
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public double calculateTotal(){
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return quantity * price;
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}
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public void printInvoice(){
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System.out.println("Producto: "+product);
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System.out.println("Cantidad: "+quantity);
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System.out.println("Precio: "+price);
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System.out.println("Total: "+calculateTotal());
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}
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public void saveToFile(){
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try (FileWriter writer = new FileWriter("invoice.txt")){
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writer.write("Producto: " + product + "\n");
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writer.write("Cantidad: " + quantity + "\n");
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writer.write("Precio Unitario: " + price + "\n");
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writer.write("Total: " + calculateTotal() + "\n");
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} catch (Exception e) {
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System.out.println("Error al guardar la factura: "+e.getMessage());
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}
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}
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}
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}

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