ref: 3642ff2c921852babc8be83d5614fbadd32a8818
dir: /Bookproj/Lib.java/
package Bookproj;
import java.io.Console;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.NoSuchElementException;
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Lib implements Library {
static Admin adm;
static User usr;
static String logfile = "Log.txt";
/* Username, Admin/User, ISBN, Book */
protected HashMap<String, Admin> AdminList = new HashMap<String, Admin>();
protected HashMap<String, User> UserList = new HashMap<String, User>();
protected ArrayList<Admin> AdminQuery = new ArrayList<Admin>();
int ResCount = 0;
private HashMap<String, Book> BookList = new HashMap<String, Book>();
private ArrayList<User> UserQuery = new ArrayList<User>();
private ArrayList<Book> BookQuery = new ArrayList<Book>();
public boolean Login(Admin u, String pass) {
/* clear null */
adm = null;
if (u.Active)
throw new IllegalStateException("Admin is already active");
/* maybe later i want to do more stuff here */
if (u.checkPass(pass)) {
u.Active = true;
Lib.adm = u;
return true;
} else
return false;
}
public void Logout(Admin a) {
if (!CheckAdmin(a.getUsername()))
throw new NoSuchElementException("No such Admin exists.");
if (!a.Active)
throw new IllegalStateException("Admin is already inactive");
a.Active = false;
}
public boolean Login(User u) {
if (u.Active)
throw new IllegalStateException("Admin is already active?");
/* maybe later i want to do more stuff here */
u.Active = true;
usr = u;
return true;
}
public void Logout(User u) {
if (!CheckUser(u.getUsername()))
throw new NoSuchElementException("No such User exists.");
if (!u.Active)
throw new IllegalStateException("User is already inactive.");
u.Active = false;
}
public Admin NewAdmin(String user, String pass) {
Admin a;
if (CheckUser(user))
throw new IllegalArgumentException("Admin already exists");
/* if user is "admin", use defaults */
if (user.equals("admin")) {
pass = "pass";
pass = Integer.toString(pass.hashCode());
}
a = new Admin(user, pass);
this.AdminList.put(a.getUsername(), a);
return a;
}
public DelErr DelAdmin(Admin u) {
if (!u.getReserved().isEmpty())
return DelErr.UserHasABook;
this.AdminList.remove(u.getUsername(), u);
return DelErr.Ok;
}
public User NewUser(String user, int age) {
User u;
if (CheckUser(user))
throw new IllegalArgumentException("User already exists");
u = new User(user, age);
this.UserList.put(user, u);
return u;
}
public DelErr DelUser(User u) {
if (!u.getReserved().isEmpty())
return DelErr.UserHasABook;
this.UserList.remove(u.getUsername(), u);
return DelErr.Ok;
}
public Book NewBook(String isbn, String name, String author, int agegroup, String abst) {
Book b;
if (CheckBook(isbn))
throw new IllegalStateException("Book already exist");
if (agegroup > 99)
agegroup = 99;
if (agegroup < 2)
agegroup = 3;
b = new Book(isbn, name, author, agegroup, abst);
this.BookList.put(isbn, b);
return b;
}
/* we shouldn't use MatchBook on UI, input is taken from user in string form */
public DelErr DelBook(String isbn) {
if (!CheckBook(isbn))
return DelErr.NoBook;
return DelBook(MatchBook(isbn));
}
public DelErr DelBook(Book b) {
if (!b.getOwner().isEmpty())
// System.err.println("User " + b.getOwner() + " have reserved this book.");
// throw new IllegalStateException("Book is reserved.");
return DelErr.UserHasABook;
this.BookList.remove(b.getISBN());
return DelErr.Ok;
}
public boolean CheckAdmin(String a)
{
for(Admin i : this.AdminList.values())
{
if(i.getUsername().equals(a))
{
return true;
}
}
return false;
}
public Admin MatchAdmin(String un)
{
Admin a = null;
for(Admin i : this.AdminList.values())
{
if(i.getUsername().equals(un))
a = i;
}
if(a == null)
throw new NoSuchElementException("No such Admin exists.");
return a;
}
public boolean FindAdmin(AdminAttr k, Pattern p)
{
Matcher m;
this.AdminQuery.clear();
for(Admin i: this.AdminList.values())
{
m = p.matcher(i.toMap().get(k));
if(m.find())
AdminQuery.add(i);
}
if(this.AdminQuery.size() == 0)
return false;
else
return true;
}
public boolean CheckUser(String u)
{
for(User i : this.UserList.values())
{
if(i.getUsername().equals(u))
{
return true;
}
}
return false;
}
public User MatchUser(String un)
{
User u = null;
for(User i : this.UserList.values())
{
if(i.getUsername().equals(un))
u = i;
}
if(u == null)
{
throw new NoSuchElementException("No such User exists.");
}
return u;
}
public boolean CheckBook(String isbn) {
boolean b = false;
for (Book i : this.BookList.values()) {
if (i.getISBN().equals(isbn))
b = true;
}
return b;
}
public Book MatchBook(String isbn) {
Book b = null;
for (Book i : this.BookList.values()) {
if (i.getISBN().equals(isbn))
b = i;
}
if (b == null)
throw new NoSuchElementException("No such book exists.");
return b;
}
public boolean FindBook(BookAttr k, Pattern p) {
Matcher m;
this.BookQuery.clear();
for (Book i : this.BookList.values()) {
m = p.matcher(i.toMap().get(k));
if (m.find())
BookQuery.add(i);
}
if (this.BookQuery.size() == 0)
return false;
else
return true;
}
public boolean FindUser(UserAttr k, Pattern p) {
Matcher m;
this.UserQuery.clear();
for (User i : this.UserList.values()) {
m = p.matcher(i.toMap().get(k));
if (m.find())
UserQuery.add(i);
}
if (this.UserQuery.size() == 0)
return false;
else
return true;
}
public boolean FindBook(boolean q) {
/* flush last query */
this.BookQuery.clear();
for (Book i : BookList.values()) {
if (i.getStatus() == q)
this.BookQuery.add(i);
}
if (this.BookQuery.size() == 0)
return false;
else
return true;
}
/* user/admin's ID, ISBN */
public TakeErr TakeBook(String un, String isbn) {
Book b = this.BookList.get(isbn);
if (this.CheckUser(un))
return TakeBook(MatchUser(un), b);
else if (this.CheckAdmin(un))
return TakeBook(MatchAdmin(un), b);
else
return TakeErr.NoUser;
}
/* they shouldn't be able to get a book, but still */
public TakeErr TakeBook(Admin a, Book b) {
/* check if book is taken */
if (b.getStatus())
return TakeErr.BookReserved;
/* he has some book? blasmphy! */
if (!a.getReserved().isEmpty())
return TakeErr.UserHasABook;
/* check if ages match admin has no age anyway
if(!b.AgeOk(a.getAge()))
return Bookproj.TakeErr.Age; */
a.setReserved(b.getISBN());
b.setOwner(a.getUsername());
b.setStatus(true);
this.ResCount++;
SaveLog(logfile, "[Take] " + b.getISBN() + " by " + a.getUsername() + '\n');
return TakeErr.Ok;
}
public TakeErr TakeBook(User u, Book b) {
/* check if book is taken */
if (b.getStatus())
return TakeErr.BookReserved;
/* he has some book? blasmphy! */
if (!u.getReserved().isEmpty())
return TakeErr.UserHasABook;
/* check if ages match */
if (!b.AgeOk(u.getAge()))
return TakeErr.Age;
u.setReserved(b.getISBN());
b.setOwner(u.getUsername());
b.setStatus(true);
this.ResCount++;
SaveLog(logfile, "[Take] " + b.getISBN() + " by " + u.getUsername() + '\n');
return TakeErr.Ok;
}
public TakeErr ReturnBook(Admin a) {
Book b;
if (a.getReserved().isEmpty())
return TakeErr.NoBookReserved;
if (!CheckBook(a.getReserved()))
return TakeErr.NoBook;
b = MatchBook(a.getReserved());
a.clearReserved();
b.setOwner(null);
b.setStatus(false);
this.ResCount--;
SaveLog(logfile, "[Return] " + b.getISBN() + " by " + a.getUsername() + '\n');
return TakeErr.Ok;
}
public TakeErr ReturnBook(User u) {
Book b;
if (u.getReserved().isEmpty())
return TakeErr.NoBookReserved;
if (!CheckBook(u.getReserved()))
return TakeErr.NoBook;
b = MatchBook(u.getReserved());
u.clearReserved();
b.setOwner(null);
b.setStatus(false);
this.ResCount--;
SaveLog(logfile, "[Return] " + b.getISBN() + " by " + u.getUsername() + '\n');
return TakeErr.Ok;
}
public void SaveLog(String fp, String in) {
try {
FileWriter fw = new FileWriter(fp, true);
fw.append(in);
fw.flush();
} catch (IOException e) {
e.printStackTrace();
}
}
class conUI implements UI {
public void Program() {
while (true) {
/* there is no admin! */
if (AdminList.size() == 0)
AddAdmin();
else
this.LoginMenu();
}
}
public void LoginMenu() {
String un, pass;
System.out.print("Login> ");
un = GetUsername();
if (CheckAdmin(un)) {
pass = this.GetPassword();
Admin a = MatchAdmin(un);
if (Login(a, pass)) {
System.out.println("Auth as " + a.getUsername() + " sucessful");
this.Menu(adm);
} else {
System.out.println("Auth fail");
this.LoginMenu();
}
} else if (CheckUser(un)) {
User u = MatchUser(un);
if (Login(u)) {
System.out.println("Login sucessful");
this.Menu(usr);
}
} else {
/* fool em! */
this.GetPassword();
System.out.println("Auth fail");
this.LoginMenu();
}
}
/* checks if password is valid, kinda like login */
public boolean AskPass(Admin u) {
String pass;
System.out.println("Enter " + u.getUsername() + "'s password:");
return u.checkPass(GetPassword());
}
public void Menu(Admin a) {
int in;
Scanner s = new Scanner(System.in);
System.out.println("Welcome, " + a.getUsername() + "!");
while (true) {
System.out.print(
"\n" +
" 1) add admin\n" +
" 2) add user\n" +
" 3) add book\n\n" +
" 4) search admin\n" +
" 5) search user\n" +
" 6) search book\n\n" +
" 7) list admin\n" +
" 8) list user\n" +
" 9) list book\n\n" +
"10) delete admin\n" +
"11) delete user\n" +
"12) delete book\n\n" +
"13) take book\n" +
"14) return book\n\n" +
"15) logout\n");
System.out.print("Admin Menu> ");
while (!s.hasNextInt()) {
System.err.print("Please enter a valid input");
s.nextLine();
System.out.print("Admin Menu> ");
}
in = s.nextInt();
s.nextLine();
switch (in) {
case 1:
if (this.AskPass(adm))
this.AddAdmin();
else
System.err.println("Incorrect Password.");
break;
case 2:
if (this.AskPass(adm))
this.AddUser();
else
System.err.println("Incorrect Password.");
break;
case 3:
this.AddBook();
break;
case 4:
this.SearchAdmin();
break;
case 5:
this.SearchUser();
break;
case 6:
this.SearchBook();
break;
case 7:
this.ListAdmin();
break;
case 8:
this.ListUser();
break;
case 9:
this.ListBook();
break;
case 10:
System.out.println("This action requires admin password");
if (this.AskPass(adm)) /* current admin */
this.RemAdmin();
else
System.err.println("Incorrect Password.");
break;
case 11:
System.out.println("This action requires admin password");
if (this.AskPass(adm)) /* current admin */
this.RemUser();
else
System.err.println("Incorrect Password.");
break;
case 12:
this.RemBook();
break;
case 13:
this.TakeMenu(adm);
break;
case 14:
this.ReturnMenu(adm);
break;
case 15:
System.out.println("Logging out...");
Logout(adm);
return;
case 88:
NewBook("1", "java book", "jack c richard", 10, "a book about java and stuff");
NewBook("42", "C book", "dennis ritche", 18, "nightmares with pointers!");
NewBook("1453", "Fall of constantipole", "konstantinus", 5, "The city has fallen");
NewUser("ali", 20);
NewUser("jalal", 10);
break;
/* quit */
case 99:
System.out.print("Quit> Are you sure? (y/N)> ");
if (s.nextLine().equals("y"))
System.exit(0);
break;
default:
System.out.println("Invalid answer!, please try again.");
break;
}
}
}
public void Menu(User u) {
int in;
Scanner s = new Scanner(System.in);
System.out.println("Hello, " + u.getUsername() + "!");
while (true) {
System.out.print(
"\n" +
" 1) search book\n" +
" 2) list book\n\n" +
" 3) take book\n" +
" 4) return book\n\n" +
" 5) logout\n");
System.out.print("User Menu> ");
while (!s.hasNextInt()) {
System.err.println("Please enter a valid input");
System.out.print("User Menu> ");
s.nextLine();
}
in = s.nextInt();
s.nextLine();
switch (in) {
case 1:
this.SearchBook();
break;
case 2:
this.ListBook();
break;
case 3:
this.TakeMenu(usr);
break;
case 4:
this.ReturnMenu(usr);
break;
case 5:
System.out.println("Logging out...");
Logout(usr);
return;
default:
System.out.println("Invalid answer!, please try again.");
break;
}
}
}
public String GetUsername() {
Scanner s = new Scanner(System.in);
String user;
do {
System.out.print("Username?> ");
user = s.nextLine();
} while (user.contains(" "));
return user;
}
public String GetPassword() {
String pass;
if (System.console() != null) {
Console c = System.console();
do {
pass = new String(c.readPassword("Password?> "));
} while (pass.equals(""));
} else {
/* no console? */
Scanner s = new Scanner(System.in);
do {
System.out.print("Password?> ");
pass = s.nextLine();
} while (pass.equals(""));
}
/* encrypt it! */
return Integer.toString(pass.hashCode());
}
public void SearchAdmin() {
String attr, patt;
Pattern pattern;
AdminAttr ua;
Scanner s = new Scanner(System.in);
System.out.println("Attr: Username, Reserved, ID, RegTime, Age, Active");
System.out.print("Find Admin> What?> ");
attr = s.nextLine();
if (attr.equalsIgnoreCase("Username"))
ua = AdminAttr.Username;
else if (attr.equalsIgnoreCase("Reserved"))
ua = AdminAttr.Reserved;
else if (attr.equalsIgnoreCase("ID"))
ua = AdminAttr.ID;
else if (attr.equalsIgnoreCase("RegTime"))
ua = AdminAttr.RegTime;
else if (attr.equalsIgnoreCase("Active"))
ua = AdminAttr.Active;
else {
System.err.println("Invalid Attr");
return;
}
System.out.print("Find Admin> Pattern?> ");
patt = s.nextLine();
pattern = Pattern.compile(patt, Pattern.CASE_INSENSITIVE);
if (FindAdmin(ua, pattern)) {
for (AdminAttr i : AdminAttr.values())
System.out.print(i + " | ");
System.out.println();
for (Admin i : AdminQuery) {
for (AdminAttr a : i.toMap().keySet())
System.out.print(i.toMap().get(a) + " | ");
System.out.println();
}
} else
System.err.println("No match has found");
}
public void SearchUser() {
String attr, patt;
Pattern pattern;
UserAttr ua;
Scanner s = new Scanner(System.in);
System.out.println("Attr: Username, Reserved, ID, RegTime, Age, Active");
System.out.print("Find User> What?> ");
attr = s.nextLine();
if (attr.equalsIgnoreCase("Username"))
ua = UserAttr.Username;
else if (attr.equalsIgnoreCase("Reserved"))
ua = UserAttr.Reserved;
else if (attr.equalsIgnoreCase("ID"))
ua = UserAttr.ID;
else if (attr.equalsIgnoreCase("RegTime"))
ua = UserAttr.RegTime;
else if (attr.equalsIgnoreCase("Age"))
ua = UserAttr.Age;
else if (attr.equalsIgnoreCase("Active"))
ua = UserAttr.Active;
else {
System.err.println("Invalid Attr");
return;
}
System.out.print("Find User> Pattern> ");
patt = s.nextLine();
pattern = Pattern.compile(patt, Pattern.CASE_INSENSITIVE);
if (FindUser(ua, pattern)) {
for (UserAttr i : UserAttr.values())
System.out.print(i + " | ");
System.out.println();
for (User i : UserQuery) {
for (UserAttr a : i.toMap().keySet())
System.out.print(i.toMap().get(a) + " | ");
System.out.println();
}
} else
System.err.println("No match has found");
}
public void SearchBook() {
String attr, patt;
Pattern pattern;
BookAttr ba;
Scanner s = new Scanner(System.in);
System.out.println("Attr: Status, Name, Abstract, ISBN, AgeGroup etc.");
System.out.print("Find Book> What?> ");
attr = s.nextLine();
if (attr.equalsIgnoreCase("ISBN"))
ba = BookAttr.ISBN;
else if (attr.equalsIgnoreCase("Status"))
ba = BookAttr.Status;
else if (attr.equalsIgnoreCase("Name"))
ba = BookAttr.Name;
else if (attr.equalsIgnoreCase("Author"))
ba = BookAttr.Author;
else if (attr.equalsIgnoreCase("Abstract"))
ba = BookAttr.Abstract;
else if (attr.equalsIgnoreCase("AgeGroup"))
ba = BookAttr.AgeGroup;
else {
System.err.println("Invalid Attr");
return;
}
System.out.print("Find Book> Pattern?> ");
patt = s.nextLine();
pattern = Pattern.compile(patt, Pattern.CASE_INSENSITIVE);
if (FindBook(ba, pattern)) {
for (BookAttr j : BookAttr.values())
System.out.print(j + " | ");
System.out.println();
for (Book j : BookQuery) {
for (BookAttr a : j.toMap().keySet())
System.out.print(j.toMap().get(a) + " | ");
System.out.println();
}
} else
System.err.println("No match has found");
}
public void AddAdmin() {
/* isn't java wonderful billy? */
String user, pass;
System.out.println("Setting up Admin:");
/* ensure there is no admin with the same username */
do {
System.out.print("Add Admin> ");
user = this.GetUsername();
if (user.equals(""))
return;
} while (CheckUser(user) || CheckAdmin(user));
pass = this.GetPassword();
NewAdmin(user, pass);
}
public void AddUser() {
int age;
String user;
Scanner s = new Scanner(System.in);
System.out.println("Setting up User:");
/* ensure there is no admin with the same username */
do {
System.out.print("Add User> ");
user = this.GetUsername();
if (user.equals(""))
return;
} while (CheckUser(user) || CheckAdmin(user));
System.out.print("Add User> Age> ");
while (!s.hasNextInt()) {
System.err.println("Please enter a valid input");
System.out.print("Add User> Age> ");
s.nextLine();
}
age = s.nextInt();
NewUser(user, age);
}
/* make checks better, reject empty input etc,
regex perhaps? */
public void AddBook() {
int agegroup;
String name, isbn, author, abs;
Scanner s = new Scanner(System.in);
System.out.print("Book> ISBN?> ");
isbn = s.nextLine();
if (isbn.equals(""))
return;
System.out.print("Book> Name?> ");
name = s.nextLine();
if (name.equals(""))
return;
System.out.print("Book> Author?> ");
author = s.nextLine();
if (author.equals(""))
return;
// XXX on a related note, should i care about dealing with multiline stuff?
System.out.print("Book> Abstract?> ");
abs = s.nextLine();
if (abs.equals(""))
return;
do {
System.out.print("Book> Age Group?> ");
while (!s.hasNextInt()) {
System.err.println("Please enter a valid input");
System.out.print("Book> Age Group?> ");
s.nextLine();
}
agegroup = s.nextInt();
} while ((agegroup > 99) || (agegroup < 2));
/* ensure it's valid ^ */
Book b = NewBook(isbn, name, author, agegroup, abs);
}
public void RemAdmin() {
String un;
Scanner s = new Scanner(System.in);
System.out.print("Remove Admin> Username> ");
un = s.nextLine();
if (un.equals(""))
return;
if (!CheckAdmin(un)) {
System.err.println("No such Admin has found.");
return;
}
if (adm.getUsername().equals(un)) {
System.err.println("You can't remove yourself.");
return;
}
System.out.print("Remove Admin> Are you sure? (y/N)> ");
if (!s.nextLine().equals("y"))
return;
Result(DelAdmin(MatchAdmin(un)));
}
public void RemUser() {
String un;
Scanner s = new Scanner(System.in);
System.out.print("Remove User> Username> ");
un = s.nextLine();
if (un.equals(""))
return;
if (!CheckUser(un)) {
System.err.println("No such user has found.");
return;
}
System.out.print("Remove User> Are you sure? (y/N)> ");
if (!s.nextLine().equals("y"))
return;
Result(DelUser(MatchUser(un)));
}
public void RemBook() {
String isbn;
Scanner s = new Scanner(System.in);
System.out.print("Remove Book> isbn> ");
isbn = s.nextLine();
if (isbn.equals(""))
return;
if (!CheckBook(isbn)) {
System.err.println("No such book has found.");
return;
}
System.out.print("Remove Book> Are you sure? (y/N)> ");
if (!s.nextLine().equals("y"))
return;
Result(DelBook(isbn));
}
public void ListAdmin() {
for (AdminAttr i : AdminAttr.values())
System.out.print(i + " | ");
System.out.println();
for (Admin i : AdminList.values()) {
for (AdminAttr a : i.toMap().keySet())
System.out.print(i.toMap().get(a) + " | ");
System.out.println();
}
}
public void ListUser() {
for (UserAttr i : UserAttr.values())
System.out.print(i + " | ");
System.out.println();
for (User i : UserList.values()) {
for (UserAttr a : i.toMap().keySet())
System.out.print(i.toMap().get(a) + " | ");
System.out.println();
}
}
public void ListBook() {
for (BookAttr i : BookAttr.values())
System.out.print(i + " | ");
System.out.println();
for (Book i : BookList.values()) {
for (BookAttr a : i.toMap().keySet())
System.out.print(i.toMap().get(a) + " | ");
System.out.println();
}
}
public void TakeMenu(Admin a) {
String isbn;
Scanner s = new Scanner(System.in);
if (!a.getReserved().isEmpty()) {
System.err.println("Current Admin has already has a book (ISBN: " + a.getReserved() + ").");
return;
}
System.out.println("Which book do you want to take? (you may find it's ISBN by Search menu)");
do {
System.out.print("Take> ISBN?> ");
isbn = s.nextLine();
if (isbn.equals(""))
return;
if (!CheckBook(isbn))
System.err.println("No such book found, please try again");
} while (isbn.contains(" ") || !CheckBook(isbn));
Result(TakeBook(a, MatchBook(isbn)));
}
public void TakeMenu(User u) {
String isbn;
Scanner s = new Scanner(System.in);
if (!u.getReserved().isEmpty()) {
System.err.println("Current User has already has a book (ISBN: " + u.getReserved() + ").");
return;
}
System.out.println("Which book do you want to take? (you may find it's ISBN by Search menu)");
do {
System.out.print("Take> ISBN?> ");
isbn = s.nextLine();
if (isbn.equals(""))
return;
if (!CheckBook(isbn))
System.err.println("No such book found, please try again");
} while (isbn.contains(" ") || !CheckBook(isbn));
Result(TakeBook(u, MatchBook(isbn)));
}
public void ReturnMenu(Admin a) {
Scanner s = new Scanner(System.in);
if (a.getReserved().isEmpty()) {
System.err.println("You have no books reserved.");
return;
}
System.out.print("Return> Are you sure? (y/N)> ");
if (s.nextLine().equals("y"))
Result(ReturnBook(a));
else
System.out.println("Thought so.");
}
public void ReturnMenu(User u) {
Scanner s = new Scanner(System.in);
if (u.getReserved().isEmpty()) {
System.err.println("You have no books reserved.");
return;
}
System.out.print("Return> Are you sure (y/N)?> ");
if (s.nextLine().equals("y"))
Result(ReturnBook(u));
else
System.out.println("Thought so.");
}
public void Result(TakeErr res) {
switch (res) {
case NoBook:
System.err.println("No such book has found");
break;
case BookReserved:
System.err.println("This book is reserved by someone else");
break;
case NoBookReserved:
System.err.println("No book is reserved");
break;
case NoUser:
System.err.println("No such User has found");
break;
case UserHasABook:
System.err.println("User has already reserved a book");
break;
case Age:
System.err.println("Age doesn't match!");
break;
case Ok:
System.out.println("Done!");
break;
default:
throw new IllegalStateException("Invalid Bookproj.TakeErr");
}
}
public void Result(DelErr res) {
switch (res) {
case UserHasABook:
System.err.println("User has reserve a book, return it");
break;
case BookReserved:
System.err.println("This book is reserved by someone else");
break;
case NoBook:
System.err.println("No such book has found");
break;
case NoUser:
System.err.println("No such user has found");
break;
case Ok:
System.out.println("Done!");
break;
default:
throw new IllegalStateException("Invalid Bookproj.DelErr");
}
}
} /* end of conUI */
}