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-rw-r--r--Week9/src/com/camilstaps/shop/Database.java393
1 files changed, 0 insertions, 393 deletions
diff --git a/Week9/src/com/camilstaps/shop/Database.java b/Week9/src/com/camilstaps/shop/Database.java
deleted file mode 100644
index 8344bca..0000000
--- a/Week9/src/com/camilstaps/shop/Database.java
+++ /dev/null
@@ -1,393 +0,0 @@
-/**
- * Copyright (c) 2015 Camil Staps <info@camilstaps.nl>
- * See the LICENSE file for copying permission.
- */
-
-package com.camilstaps.shop;
-
-import java.io.File;
-import java.io.FileInputStream;
-import java.io.FileNotFoundException;
-import java.io.FileOutputStream;
-import java.io.IOException;
-import java.io.ObjectInputStream;
-import java.io.ObjectOutputStream;
-import java.util.HashSet;
-import java.util.Set;
-import java.util.regex.Pattern;
-
-/**
- * The Shop database
- * @author Camil Staps, s4498062
- */
-public class Database {
-
- /**
- * This is a singleton
- */
- private static Database instance;
-
- /**
- * Keep the database in working memory during runtime
- */
- private Set<User> users;
- private Set<Article> articles;
- private Set<Category> categories;
- private Set<Order> orders;
-
- /**
- * Files to store the database
- * Considering backups, it's nicer to have different objects stored in
- * different files, so that if the Orders file breaks, we still have the
- * Users, etc.
- */
- private final File FILE_DB = new File("./db");
- private final File FILE_USERS = new File("./db/users.db");
- private final File FILE_ARTICLES = new File("./db/articles.db");
- private final File FILE_CATEGORIES = new File("./db/categories.db");
- private final File FILE_ORDERS = new File("./db/orders.db");
-
- /**
- * Don't use this constructor. This is a singleton: use getInstance() instead.
- * @see self#getInstance()
- */
- public Database() {
- if (!FILE_DB.exists())
- FILE_DB.mkdir();
-
- readUsers();
- readArticles();
- readCategories();
- readOrders();
- }
-
- /**
- * Get an instance of the database. This is a singleton.
- * @return the database
- */
- public static Database getInstance() {
- if (instance == null) {
- instance = new Database();
- }
- return instance;
- }
-
- /**
- * Add an item to the database
- * @param item the item
- * @throws com.camilstaps.shop.DuplicateEntryException
- * @throws ClassCastException if the item to remove is not a DatabaseItem
- */
- public void addItem(DatabaseItem item) throws DuplicateEntryException {
- if (item instanceof User) {
- if (isUserExists(((User) item).getNr())) {
- throw new DuplicateEntryException();
- }
- users.add((User) item);
- } else if (item instanceof Article) {
- if (isArticleExists(((Article) item).getName())) {
- throw new DuplicateEntryException();
- }
- articles.add((Article) item);
- } else if (item instanceof Category) {
- if (isCategoryExists(((Category) item).getName())) {
- throw new DuplicateEntryException();
- }
- categories.add((Category) item);
- } else if (item instanceof Order) {
- orders.add((Order) item);
- } else {
- throw new ClassCastException();
- }
- }
-
- /**
- * Remove an item from the database
- * @param item the item to remove
- * @throws ClassCastException if the item to remove is not a DatabaseItem
- */
- public void removeItem(DatabaseItem item) {
- if (item instanceof User) {
- users.remove((User) item);
- } else if (item instanceof Article) {
- articles.remove((Article) item);
- } else if (item instanceof Category) {
- categories.remove((Category) item);
- } else if (item instanceof Order) {
- orders.remove((Order) item);
- } else {
- throw new ClassCastException();
- }
- }
-
- /**
- * Save the database to the filesystem.
- * @return true on success, false on failure
- */
- public boolean write() {
- return writeUsers() && writeArticles() && writeCategories() && writeOrders();
- }
-
- /**
- * Check if there exists a user with a certain U/S-number
- * @param nr
- * @return
- */
- public boolean isUserExists(String nr) {
- for (User user : users) {
- if (user.getNr().equals(nr)) {
- return true;
- }
- }
- return false;
- }
-
- /**
- * Check if an article with a name exists
- * @param name
- * @return
- */
- public boolean isArticleExists(String name) {
- for (Article article : articles) {
- if (article.getName().equals(name)) {
- return true;
- }
- }
- return false;
- }
-
- /**
- * Check if a category with a name exists
- * @param name
- * @return
- */
- public boolean isCategoryExists(String name) {
- for (Category category : categories) {
- if (category.getName().equals(name)) {
- return true;
- }
- }
- return false;
- }
-
- /**
- * Get the set of users
- * @return
- */
- public Set<User> getUsers() {
- return users;
- }
-
- /**
- * Get the set of articles
- * @return
- */
- public Set<Article> getArticles() {
- return articles;
- }
-
- /**
- * Get the set of categories
- * @return
- */
- public Set<Category> getCategories() {
- return categories;
- }
-
- /**
- * Get an array of the names of the categories
- * @return
- */
- public String[] getCategoryNames() {
- String[] categoryNames = new String[categories.size()];
- int i = 0;
- for (Category c : categories) {
- categoryNames[i++] = c.getName();
- }
- return categoryNames;
- }
-
- /**
- * Get the set of orders
- * @return
- */
- public Set<Order> getOrders() {
- return orders;
- }
-
- /**
- * Get the set of articles of which the name or description matches a regular expression
- * @param p the regular expression
- * @return
- */
- public Set<Article> searchArticle(Pattern p) {
- Set<Article> result = new HashSet<>();
- for (Article a : articles) {
- if (p.matcher(a.getName()).find() || p.matcher(a.getDescription()).find()) {
- result.add(a);
- }
- }
- return result;
- }
-
- /**
- * Get a user by his number
- * @param number
- * @return
- * @throws com.camilstaps.shop.ItemNotFoundException
- */
- public User getUser(String number) throws ItemNotFoundException {
- for (User u : users) {
- if (u.getNr().equals(number)) {
- return u;
- }
- }
- throw new ItemNotFoundException();
- }
-
- /**
- * Get an article by its name
- * @param name
- * @return
- * @throws ItemNotFoundException
- */
- public Article getArticle(String name) throws ItemNotFoundException {
- for (Article a : articles) {
- if (a.getName().equals(name)) {
- return a;
- }
- }
- throw new ItemNotFoundException();
- }
-
- /**
- * Get a category by a name
- * @param name
- * @return
- */
- public Category getCategory(String name) throws ItemNotFoundException {
- for (Category c : categories) {
- if (c.getName().equals(name)) {
- return c;
- }
- }
- throw new ItemNotFoundException();
- }
-
- /**
- * Read the users from the database into RAM
- */
- private void readUsers() {
- users = new HashSet<>();
- try (ObjectInputStream in = new ObjectInputStream(new FileInputStream(FILE_USERS))) {
- users = (Set) in.readObject();
- in.close();
- } catch (FileNotFoundException ex) {
- } catch (IOException | ClassNotFoundException ex) {
- }
- }
-
- /**
- * Read the articles from the database into RAM
- */
- private void readArticles() {
- articles = new HashSet<>();
- try (ObjectInputStream in = new ObjectInputStream(new FileInputStream(FILE_ARTICLES))) {
- articles = (Set) in.readObject();
- in.close();
- } catch (FileNotFoundException ex) {
- } catch (IOException | ClassNotFoundException ex) {
- }
- }
-
- /**
- * Read the categories from the database into RAM
- */
- private void readCategories() {
- categories = new HashSet<>();
- try (ObjectInputStream in = new ObjectInputStream(new FileInputStream(FILE_CATEGORIES))) {
- categories = (Set) in.readObject();
- in.close();
- } catch (FileNotFoundException ex) {
- } catch (IOException | ClassNotFoundException ex) {
- }
- }
-
- /**
- * Read the orders from the database into RAM
- */
- private void readOrders() {
- orders = new HashSet<>();
- try (ObjectInputStream in = new ObjectInputStream(new FileInputStream(FILE_ORDERS))) {
- orders = (Set) in.readObject();
- in.close();
- } catch (FileNotFoundException ex) {
- } catch (IOException | ClassNotFoundException ex) {
- }
- }
-
- /**
- * Write the users from RAM to the database
- */
- private boolean writeUsers() {
- System.err.println("Saving users...");
-
- try (ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(FILE_USERS))) {
- out.writeObject(users);
- out.close();
- return true;
- } catch (IOException ex) {
- ex.printStackTrace();
- }
- return false;
- }
-
- /**
- * Write the articles from RAM to the database
- */
- private boolean writeArticles() {
- System.err.println("Saving articles...");
-
- try (ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(FILE_ARTICLES))) {
- out.writeObject(articles);
- out.close();
- return true;
- } catch (IOException ex) {
- ex.printStackTrace();
- }
- return false;
- }
-
- /**
- * Write the categories from RAM to the database
- */
- private boolean writeCategories() {
- System.err.println("Saving categories...");
-
- try (ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(FILE_CATEGORIES))) {
- out.writeObject(categories);
- out.close();
- return true;
- } catch (IOException ex) {
- ex.printStackTrace();
- }
- return false;
- }
-
- /**
- * Write the orders from RAM to the database
- */
- private boolean writeOrders() {
- System.err.println("Saving orders...");
-
- try (ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(FILE_ORDERS))) {
- out.writeObject(orders);
- out.close();
- return true;
- } catch (IOException ex) {
- ex.printStackTrace();
- }
- return false;
- }
-
-} \ No newline at end of file
generated by cgit v1.2.3 (git 2.39.1) at 2025-05-02 12:50:32 +0000