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package FileManagement; import java.io.*; import java.util.LinkedList; public class FileManager { private LinkedList <String> managed ; private static String baselocation = "/home/ammar/Downloads/LocalDataBase/"; private static String AllUsersDataPath = "/home/ammar/Downloads/LocalDataBase/AllUsersData"; public FileManager () { managed = new LinkedList<String>(); } public void add (String neww) { managed.add(neww); } public void remove (String rm) { managed.remove(rm); } public String get(int idx) { return managed.get(idx); } @SuppressWarnings("unchecked") public static LinkedList<User> UploadAllData(){ LinkedList<User> data; File file = new File(AllUsersDataPath); try { ObjectInputStream ois = new ObjectInputStream(new FileInputStream(file)); data = (LinkedList<User>)ois.readObject(); return data; } catch (IOException e) { System.err.println(e.getMessage()); } catch (ClassNotFoundException e) { System.out.println(e.getMessage()); } return null; } public static void addUserInSystem(String uname) { String location = baselocation + uname; File file = new File(location); file.mkdir(); } public static void deleteUserFromSystem(String uname) { String location = baselocation + uname; File file = new File(location); file.delete(); } public static void updateAllUsersData(LinkedList<User> newData) { File file = new File(AllUsersDataPath); try { ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(file)); oos.writeObject(newData); } catch (IOException e) { System.err.println(e.getMessage()); } } public static boolean isUserExist (User user) { LinkedList <User> data = FileManager.UploadAllData(); int idx = 0; while(data.get(idx) != null) { if(data.get(idx).equals(user))return true; idx++; } return false; } public static boolean updateUserData(User olduser , User newuser) { LinkedList <User> data = FileManager.UploadAllData(); if(! FileManager.isUserExist(olduser)) return false; int idx = 0; while(data.get(idx) != null) { if(data.get(idx).equals(olduser)) { data.set(idx, newuser); } idx++; } FileManager.updateAllUsersData(data); return true; } }
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