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LibrarySystem
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Converted all factory files to Kotlin

master
BinHong Lee 7 anni fa
parent
af3dd212d1
commit
ee02077edb
9 ha cambiato i file con 604 aggiunte e 420 eliminazioni
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  1. +23
    -0
      pom.xml
  2. +0
    -210
      src/main/java/libsys/BookFactory.java
  3. +73
    -0
      src/main/java/libsys/DeleteBook.form
  4. +113
    -0
      src/main/java/libsys/DeleteBook.java
  5. +5
    -5
      src/main/java/libsys/Main.java
  6. +1
    -1
      src/main/java/libsys/Settings.java
  7. +0
    -204
      src/main/java/libsys/UserFactory.java
  8. +208
    -0
      src/main/kotlin/libsys/BookFactory.kt
  9. +181
    -0
      src/main/kotlin/libsys/UserFactory.kt

+ 23
- 0
pom.xml Vedi File

@@ -36,9 +36,32 @@
<version>${kotlin.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.intellij</groupId>
<artifactId>forms_rt</artifactId>
<version>7.0.3</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>ideauidesigner-maven-plugin</artifactId>
<version>1.0-beta-1</version>
<executions>
<execution>
<goals>
<goal>javac2</goal>
</goals>
</execution>
</executions>

<configuration>
<fork>true</fork>
<debug>true</debug>
<failOnError>true</failOnError>
</configuration>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>


+ 0
- 210
src/main/java/libsys/BookFactory.java Vedi File

@@ -1,210 +0,0 @@
package libsys;
/*
* Written by : Bin Hong Lee
* Last edited : 7/4/2017
*/

import java.util.List;
import java.util.ArrayList;
import org.json.JSONObject;
import org.json.JSONTokener;
import org.json.JSONArray;
import java.io.FileInputStream;
import java.io.PrintWriter;

/**
* Handles all the Book(s)
*/
public class BookFactory
{
private List<Book> books = new ArrayList<Book>();
private int id;
private String bookFilename;

/**
* Create a new empty BookFactory
*/
public BookFactory()
{
id = 0;
bookFilename = "books.json";
}

/**
* Create a new BookFactory and fill it with information from a JSON file
* @param bookFilename Name of the input JSON file
*/
public BookFactory(String bookFilename)
{
try
{
FileInputStream in = new FileInputStream(bookFilename);
JSONObject obj = new JSONObject(new JSONTokener(in));
String [] ids = JSONObject.getNames(obj);

for (String id1 : ids) {
JSONObject jsonBook = obj.getJSONObject(id1);
int id = Integer.parseInt(id1);
String title = jsonBook.getString("Title");
String status = jsonBook.getString("Status");
JSONArray jsonDueDate = jsonBook.getJSONArray("Due Date");
int[] dueDate = new int[jsonDueDate.length()];

for (int j = 0; j < jsonDueDate.length(); j++) {
dueDate[j] = jsonDueDate.optInt(j);
}
books.add(new Book(id, title, status, dueDate));
}
in.close();
id = books.get(books.size() - 1).getId() + 1;
}
catch (Exception ex)
{
System.out.println(ex.getMessage());
id = 0;
}

this.bookFilename = bookFilename;
}

/**
* Output the data into a JSON file replacing the input file (or if filename not given, "books.json")
*/
void toJsonFile()
{
try
{
PrintWriter out = new PrintWriter(bookFilename);
JSONObject booksObj = new JSONObject();
for (Book book : books) {
JSONObject bookObj = new JSONObject();
bookObj.put("Title", book.getTitle());
bookObj.put("Status", book.getStatus());
bookObj.put("Due Date", book.getDueDate());
booksObj.put(Integer.toString(book.getId()), bookObj);
}
out.println(booksObj.toString(4));
out.close();
}
catch (Exception e)
{
System.out.println("exception: " + e.getMessage());
e.printStackTrace();
}
}

/**
* Update the output filename for the object
* @param bookFilename The new filename
*/
void setBookFileName(String bookFilename)
{
this.bookFilename = bookFilename;
}

/**
* Adds a new Book into this class
* @param title Title of the Book
* @param status Status of the Book
* @return The new Book that is just created
*/
Book newBook(String title, String status)
{
Book temp = new Book(title, id, status);
books.add(temp);

id++;
toJsonFile();

return temp;
}

/**
* Looks for a Book with the given id
* @param index id of the Book to be found
* @return Book with the given id
*/
Book getBook(int index)
{
return search(index, 0, books.size() - 1);
}

/**
* Recursive binary search through the array list for the Book with the given id
* @param index id of the Book to be found
* @param start Starting point to search
* @param end Ending point to search
* @return Book with the given id
*/
private Book search(int index, int start, int end)
{
if (start == end && books.get(start).getId() == index)
{
return books.get(start);
}

if (start >= end)
{
throw new NullPointerException();
}

int currentId = ((start + end) / 2);

if (books.get(currentId).getId() == index)
{
return books.get(currentId);
}
else if (books.get(currentId).getId() > index)
{
return search(index, start, currentId - 1);
}
else
{
return search(index, currentId + 1, end);
}
}

/**
* Linear search through the array list for Book with the given Title
* @param title Title of the Book to be found
* @return Book with the given title
*/
Book getBook(String title)
{
for (Book temp : books) {
if (temp.getTitle().equals(title))
{
return temp;
}
}

throw new NullPointerException();
}

/**
* Replacing a Book in the array list with a new Book
* @param oldBook Book to be replaced
* @param newBook Book replacing it
*/
public void update(Book oldBook, Book newBook)
{
boolean found = false;
for (int i = 0; i < books.size(); i++)
{
Book temp = books.get(i);

if(temp.getId() == oldBook.getId())
{
books.set(i, newBook);
found = true;
}
}

if (!found)
{
throw new NullPointerException();
}

toJsonFile();
}
}

+ 73
- 0
src/main/java/libsys/DeleteBook.form Vedi File

@@ -0,0 +1,73 @@
<?xml version="1.0" encoding="UTF-8"?>
<form xmlns="http://www.intellij.com/uidesigner/form/" version="1" bind-to-class="libsys.DeleteBook">
<grid id="cbd77" binding="contentPane" layout-manager="GridLayoutManager" row-count="2" column-count="1" same-size-horizontally="true" same-size-vertically="false" hgap="-1" vgap="-1">
<margin top="10" left="10" bottom="10" right="10"/>
<constraints>
<xy x="48" y="54" width="550" height="173"/>
</constraints>
<properties/>
<border type="none"/>
<children>
<grid id="94766" layout-manager="GridLayoutManager" row-count="1" column-count="2" same-size-horizontally="false" same-size-vertically="false" hgap="-1" vgap="-1">
<margin top="0" left="0" bottom="0" right="0"/>
<constraints>
<grid row="1" column="0" row-span="1" col-span="1" vsize-policy="1" hsize-policy="3" anchor="0" fill="3" indent="0" use-parent-layout="false"/>
</constraints>
<properties/>
<border type="none"/>
<children>
<hspacer id="98af6">
<constraints>
<grid row="0" column="0" row-span="1" col-span="1" vsize-policy="1" hsize-policy="6" anchor="0" fill="1" indent="0" use-parent-layout="false"/>
</constraints>
</hspacer>
<grid id="9538f" layout-manager="GridLayoutManager" row-count="1" column-count="2" same-size-horizontally="true" same-size-vertically="false" hgap="-1" vgap="-1">
<margin top="0" left="0" bottom="0" right="0"/>
<constraints>
<grid row="0" column="1" row-span="1" col-span="1" vsize-policy="3" hsize-policy="3" anchor="0" fill="3" indent="0" use-parent-layout="false"/>
</constraints>
<properties/>
<border type="none"/>
<children>
<component id="e7465" class="javax.swing.JButton" binding="buttonOK">
<constraints>
<grid row="0" column="0" row-span="1" col-span="1" vsize-policy="0" hsize-policy="3" anchor="0" fill="1" indent="0" use-parent-layout="false"/>
</constraints>
<properties>
<text value="OK"/>
</properties>
</component>
<component id="5723f" class="javax.swing.JButton" binding="buttonCancel">
<constraints>
<grid row="0" column="1" row-span="1" col-span="1" vsize-policy="0" hsize-policy="3" anchor="0" fill="1" indent="0" use-parent-layout="false"/>
</constraints>
<properties>
<text value="Cancel"/>
</properties>
</component>
</children>
</grid>
</children>
</grid>
<grid id="e3588" layout-manager="GridLayoutManager" row-count="1" column-count="1" same-size-horizontally="false" same-size-vertically="false" hgap="-1" vgap="-1">
<margin top="0" left="0" bottom="0" right="0"/>
<constraints>
<grid row="0" column="0" row-span="1" col-span="1" vsize-policy="3" hsize-policy="3" anchor="0" fill="3" indent="0" use-parent-layout="false"/>
</constraints>
<properties/>
<border type="none"/>
<children>
<component id="f9920" class="javax.swing.JLabel" binding="warningLbl">
<constraints>
<grid row="0" column="0" row-span="1" col-span="1" vsize-policy="0" hsize-policy="0" anchor="0" fill="0" indent="0" use-parent-layout="false"/>
</constraints>
<properties>
<font size="26"/>
<text value="Are you sure you want to delete this book?"/>
</properties>
</component>
</children>
</grid>
</children>
</grid>
</form>

+ 113
- 0
src/main/java/libsys/DeleteBook.java Vedi File

@@ -0,0 +1,113 @@
package libsys;

import com.intellij.uiDesigner.core.GridConstraints;
import com.intellij.uiDesigner.core.GridLayoutManager;
import com.intellij.uiDesigner.core.Spacer;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class DeleteBook extends JDialog {
private JPanel contentPane;
private JButton buttonOK;
private JButton buttonCancel;
private JLabel warningLbl;

public DeleteBook() {
setContentPane(contentPane);
setModal(true);
getRootPane().setDefaultButton(buttonOK);

buttonOK.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
onOK();
}
});

buttonCancel.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
onCancel();
}
});

// call onCancel() when cross is clicked
setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
onCancel();
}
});

// call onCancel() on ESCAPE
contentPane.registerKeyboardAction(new ActionListener() {
public void actionPerformed(ActionEvent e) {
onCancel();
}
}, KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0), JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
}

private void onOK() {
// add your code here
dispose();
}

private void onCancel() {
// add your code here if necessary
dispose();
}

public static void main(String[] args) {
DeleteBook dialog = new DeleteBook();
dialog.pack();
dialog.setVisible(true);
System.exit(0);
}

{
// GUI initializer generated by IntelliJ IDEA GUI Designer
// >>> IMPORTANT!! <<<
// DO NOT EDIT OR ADD ANY CODE HERE!
$$$setupUI$$$();
}

/**
* Method generated by IntelliJ IDEA GUI Designer
* >>> IMPORTANT!! <<<
* DO NOT edit this method OR call it in your code!
*
* @noinspection ALL
*/
private void $$$setupUI$$$() {
contentPane = new JPanel();
contentPane.setLayout(new GridLayoutManager(2, 1, new Insets(10, 10, 10, 10), -1, -1));
final JPanel panel1 = new JPanel();
panel1.setLayout(new GridLayoutManager(1, 2, new Insets(0, 0, 0, 0), -1, -1));
contentPane.add(panel1, new GridConstraints(1, 0, 1, 1, GridConstraints.ANCHOR_CENTER, GridConstraints.FILL_BOTH, GridConstraints.SIZEPOLICY_CAN_SHRINK | GridConstraints.SIZEPOLICY_CAN_GROW, 1, null, null, null, 0, false));
final Spacer spacer1 = new Spacer();
panel1.add(spacer1, new GridConstraints(0, 0, 1, 1, GridConstraints.ANCHOR_CENTER, GridConstraints.FILL_HORIZONTAL, GridConstraints.SIZEPOLICY_WANT_GROW, 1, null, null, null, 0, false));
final JPanel panel2 = new JPanel();
panel2.setLayout(new GridLayoutManager(1, 2, new Insets(0, 0, 0, 0), -1, -1, true, false));
panel1.add(panel2, new GridConstraints(0, 1, 1, 1, GridConstraints.ANCHOR_CENTER, GridConstraints.FILL_BOTH, GridConstraints.SIZEPOLICY_CAN_SHRINK | GridConstraints.SIZEPOLICY_CAN_GROW, GridConstraints.SIZEPOLICY_CAN_SHRINK | GridConstraints.SIZEPOLICY_CAN_GROW, null, null, null, 0, false));
buttonOK = new JButton();
buttonOK.setText("OK");
panel2.add(buttonOK, new GridConstraints(0, 0, 1, 1, GridConstraints.ANCHOR_CENTER, GridConstraints.FILL_HORIZONTAL, GridConstraints.SIZEPOLICY_CAN_SHRINK | GridConstraints.SIZEPOLICY_CAN_GROW, GridConstraints.SIZEPOLICY_FIXED, null, null, null, 0, false));
buttonCancel = new JButton();
buttonCancel.setText("Cancel");
panel2.add(buttonCancel, new GridConstraints(0, 1, 1, 1, GridConstraints.ANCHOR_CENTER, GridConstraints.FILL_HORIZONTAL, GridConstraints.SIZEPOLICY_CAN_SHRINK | GridConstraints.SIZEPOLICY_CAN_GROW, GridConstraints.SIZEPOLICY_FIXED, null, null, null, 0, false));
final JPanel panel3 = new JPanel();
panel3.setLayout(new GridLayoutManager(1, 1, new Insets(0, 0, 0, 0), -1, -1));
contentPane.add(panel3, new GridConstraints(0, 0, 1, 1, GridConstraints.ANCHOR_CENTER, GridConstraints.FILL_BOTH, GridConstraints.SIZEPOLICY_CAN_SHRINK | GridConstraints.SIZEPOLICY_CAN_GROW, GridConstraints.SIZEPOLICY_CAN_SHRINK | GridConstraints.SIZEPOLICY_CAN_GROW, null, null, null, 0, false));
warningLbl = new JLabel();
warningLbl.setFont(new Font(warningLbl.getFont().getName(), warningLbl.getFont().getStyle(), 26));
warningLbl.setText("Are you sure you want to delete this book?");
panel3.add(warningLbl, new GridConstraints(0, 0, 1, 1, GridConstraints.ANCHOR_CENTER, GridConstraints.FILL_NONE, GridConstraints.SIZEPOLICY_FIXED, GridConstraints.SIZEPOLICY_FIXED, null, null, null, 0, false));
}

/**
* @noinspection ALL
*/
public JComponent $$$getRootComponent$$$() {
return contentPane;
}
}

+ 5
- 5
src/main/java/libsys/Main.java Vedi File

@@ -1,7 +1,7 @@
package libsys;
/*
* Written by : Bin Hong Lee
* Last edited : 6/4/2017
* Last edited : 7/4/2017
*/

/**
@@ -9,12 +9,12 @@ package libsys;
*/
public class Main
{
static Settings settings = new Settings("settings.txt");
static String bookFilename = settings.get("Books Filename");
static String userFilename = settings.get("Users Filename");
private static Settings settings = new Settings("settings.txt");
private static String bookFilename = settings.get("Books Filename");
private static String userFilename = settings.get("Users Filename");

/**
* Start the applicationn
* Start the application
* @param args
*/
public static void main(String[] args)


+ 1
- 1
src/main/java/libsys/Settings.java Vedi File

@@ -61,7 +61,7 @@ public class Settings
}
catch (Exception e)
{
System.out.println(e.getMessage());
System.out.println("Invalid output filename");
setDefault();
}
}


+ 0
- 204
src/main/java/libsys/UserFactory.java Vedi File

@@ -1,204 +0,0 @@
package libsys;
/*
* Written by : Bin Hong Lee
* Last edited : 6/4/2017
*/

import org.json.JSONArray;
import org.json.JSONObject;
import org.json.JSONTokener;

import java.io.FileInputStream;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;

/**
* Handles all the User(s)
*/
public class UserFactory
{
private List<User> users = new ArrayList<User>();
private int id;
private String userFilename;

/**
* Create a new empty UserFactory
*/
public UserFactory()
{
id = 0;
userFilename = "users.json";
}

/**
* Create a new UserFactory and fill it with information from a JSON file
* @param userFilename Name of the input JSON file
*/
public UserFactory(String userFilename)
{
try
{
FileInputStream in = new FileInputStream(userFilename);
JSONObject obj = new JSONObject(new JSONTokener(in));
String [] ids = JSONObject.getNames(obj);

for (String id1 : ids) {
JSONObject jsonUser = obj.getJSONObject(id1);
int id = Integer.parseInt(id1);
String name = jsonUser.getString("Name");
int limit = jsonUser.getInt("Limit");

JSONArray jsonBooks = jsonUser.getJSONArray("Books");
ArrayList<Integer> books = new ArrayList<Integer>();
for (int j = 0; j < jsonBooks.length(); j++) {
books.add(Integer.parseInt(jsonBooks.get(j).toString()));
}

users.add(new User(name, id, limit, books));
}
in.close();
id = getUser(users.size()-1).getId() + 1;
}
catch (Exception ex)
{
System.out.println("Exception importing from json: " + ex.getMessage());
id = 0;
}

this.userFilename = userFilename;
}

/**
* Output the data into a JSON file replacing the input file (or if filename not given, "users.json")
*/
void toJsonFile()
{
try
{
PrintWriter out = new PrintWriter(userFilename);
JSONObject usersObj = new JSONObject();
for (User user : users) {
JSONObject userObj = new JSONObject();
userObj.put("Name", user.getName());
userObj.put("Limit", user.getLimit());
userObj.put("Books", user.bookStatus());
usersObj.put(Integer.toString(user.getId()), userObj);
}
out.println(usersObj.toString(4));
out.close();
}
catch (Exception e)
{
System.out.println("exception: " + e.getMessage());
e.printStackTrace();
}
}

/**
* Update the output filename for the object
* @param userFilename The new filename
*/
void setUserFileName(String userFilename)
{
this.userFilename = userFilename;
}

/**
* Adds a new User into this class
* @param name Name of the User
* @param limit Limit of Book the User can borrow
* @return The new User that is just created
*/
User newUser(String name, int limit)
{
User temp = new User(name, id, limit);
users.add(temp);

id++;
toJsonFile();

return temp;
}

/**
* Looks for the User with the given name
* @param name Name of the User to be found
* @return User with the given name
*/
User getUser(String name)
{
for (User temp : users) {
if (temp.getName().equals(name)) {
return temp;
}
}

throw new NullPointerException();
}

/**
* Looks for a User with the given id
* @param index id of the User to be found
* @return User with the given id
*/
User getUser(int index)
{
return search(index, 0, users.size() - 1);
}

/**
* Recursive binary search through the array list for the User with the given id
* @param index id of the User to be found
* @param start Starting point to search
* @param end Ending point to search
* @return User with the given id
*/
private User search(int index, int start, int end)
{
if (start == end && users.get(start).getId() == index)
{
return users.get(start);
}

if (start >= end)
{
throw new NullPointerException();
}

int currentId = ((start + end) / 2);

if (users.get(currentId).getId() == index)
{
return users.get(currentId);
}
else if (users.get(currentId).getId() > index)
{
return search(index, start, currentId - 1);
}
else
{
return search(index, currentId + 1, end);
}
}

/**
* Replacing a User in the array list with a new User
* @param oldUser User to be replaced
* @param newUser User replacing it
*/
public void update(User oldUser, User newUser)
{
for (int i = 0; i < users.size(); i++)
{
User temp = users.get(i);

if(temp.getId() == oldUser.getId())
{
users.set(i, newUser);
}
}

toJsonFile();
}
}

+ 208
- 0
src/main/kotlin/libsys/BookFactory.kt Vedi File

@@ -0,0 +1,208 @@
package libsys

/*
* Written by : Bin Hong Lee
* Last edited : 7/4/2017
*/

import java.util.ArrayList
import org.json.JSONObject
import org.json.JSONTokener
import java.io.FileInputStream
import java.io.PrintWriter

/**
* Handles all the Book(s)
*/
class BookFactory {
private val books = ArrayList<Book>()
private var id: Int = 0
private var bookFilename: String? = null

/**
* @constructor Create a new empty BookFactory
*/
constructor() {
id = 0
bookFilename = "books.json"
}

/**
* @constructor Create a new BookFactory and fill it with information from a JSON file
*
* @param bookFilename Name of the input JSON file
*/
constructor(bookFilename: String) {
try {
val `in` = FileInputStream(bookFilename)
val obj = JSONObject(JSONTokener(`in`))
val ids = JSONObject.getNames(obj)

for (id1 in ids) {
val jsonBook = obj.getJSONObject(id1)
val id = Integer.parseInt(id1)
val title = jsonBook.getString("Title")
val status = jsonBook.getString("Status")
val jsonDueDate = jsonBook.getJSONArray("Due Date")
val dueDate = IntArray(jsonDueDate.length())

for (j in 0..jsonDueDate.length() - 1) {
dueDate[j] = jsonDueDate.optInt(j)
}
books.add(Book(id, title, status, dueDate))
}
`in`.close()
id = books[books.size - 1].id + 1
} catch (ex: Exception) {
println(ex.message)
id = 0
}

this.bookFilename = bookFilename
}

/**
* Output the data into a JSON file replacing the input file (or if filename not given, "books.json")
*/
fun toJsonFile()
{
try
{
val out = PrintWriter(bookFilename!!)
val booksObj = JSONObject()

for (book in books)
{
val bookObj = JSONObject()
bookObj.put("Title", book.title)
bookObj.put("Status", book.status)
bookObj.put("Due Date", book.dueDate)
booksObj.put(Integer.toString(book.id), bookObj)
}

out.println(booksObj.toString(4))
out.close()
}
catch (e: Exception)
{
println("Invalid output filename.")
}
}

/**
* Update the output filename for the object
* @param bookFilename The new filename
*/
fun setBookFileName(bookFilename: String)
{
this.bookFilename = bookFilename
}

/**
* Adds a new Book into this class
* @param title Title of the Book
* @param status Status of the Book
*
* @return The new Book that is just created
*/
fun newBook(title: String, status: String): Book
{
val temp = Book(title, id, status)
books.add(temp)

id++
toJsonFile()

return temp
}

/**
* Looks for a Book with the given id
* @param index id of the Book to be found
*
* @return Book with the given id
*/
fun getBook(index: Int): Book
{
return search(index, 0, books.size - 1)
}

/**
* Recursive binary search through the array list for the Book with the given id
* @param index id of the Book to be found
* @param start Starting point to search
* @param end Ending point to search
*
* @return Book with the given id
*/
private fun search(index: Int, start: Int, end: Int): Book
{
if (start == end && books[start].id == index)
{
return books[start]
}

if (start >= end)
{
throw NullPointerException()
}

val currentId = (start + end) / 2

if (books[currentId].id == index)
{
return books[currentId]
}
else if (books[currentId].id > index)
{
return search(index, start, currentId - 1)
}
else
{
return search(index, currentId + 1, end)
}
}

/**
* Linear search through the array list for Book with the given Title
* @param title Title of the Book to be found
*
* @return Book with the given title
*/
fun getBook(title: String): Book
{
books
.asSequence()
.filter { it.title == title }
.forEach { return it }

throw NullPointerException()
}

/**
* Replacing a Book in the array list with a new Book
* @param oldBook Book to be replaced
* @param newBook Book replacing it
*/
fun update(oldBook: Book, newBook: Book)
{
var found = false
for (i in books.indices)
{
val temp = books[i]

if (temp.id == oldBook.id)
{
books[i] = newBook
found = true
}
}

if (!found)
{
throw NullPointerException()
}

toJsonFile()
}
}

+ 181
- 0
src/main/kotlin/libsys/UserFactory.kt Vedi File

@@ -0,0 +1,181 @@
package libsys

/*
* Written by : Bin Hong Lee
* Last edited : 7/4/2017
*/

import org.json.JSONObject
import org.json.JSONTokener

import java.io.FileInputStream
import java.io.PrintWriter
import java.util.ArrayList

/**
* Handles all the User(s)
*/
class UserFactory {
private val users = ArrayList<User>()
private var id: Int = 0
private var userFilename: String? = null

/**
* @constructor Create a new empty UserFactory
*/
constructor() {
id = 0
userFilename = "users.json"
}

/**
* @constructor Create a new UserFactory and fill it with information from a JSON file
* @param userFilename Name of the input JSON file
*/
constructor(userFilename: String) {
try {
val `in` = FileInputStream(userFilename)
val obj = JSONObject(JSONTokener(`in`))
val ids = JSONObject.getNames(obj)

for (id1 in ids) {
val jsonUser = obj.getJSONObject(id1)
val id = Integer.parseInt(id1)
val name = jsonUser.getString("Name")
val limit = jsonUser.getInt("Limit")

val jsonBooks = jsonUser.getJSONArray("Books")
val books = (0..jsonBooks.length() - 1).mapTo(ArrayList<Int>())
{
Integer.parseInt(jsonBooks.get(it).toString())
}

users.add(User(name, id, limit, books))
}
`in`.close()
id = getUser(users.size - 1).id + 1
} catch (ex: Exception) {
println("Exception importing from json: " + ex.message)
id = 0
}

this.userFilename = userFilename
}

/**
* Output the data into a JSON file replacing the input file (or if filename not given, "users.json")
*/
fun toJsonFile() {
try {
val out = PrintWriter(userFilename!!)
val usersObj = JSONObject()
for (user in users) {
val userObj = JSONObject()
userObj.put("Name", user.name)
userObj.put("Limit", user.limit)
userObj.put("Books", user.bookStatus())
usersObj.put(Integer.toString(user.id), userObj)
}
out.println(usersObj.toString(4))
out.close()
} catch (e: Exception) {
println("Invalid output filename")
}

}

/**
* Update the output filename for the object
* @param userFilename The new filename
*/
fun setUserFileName(userFilename: String) {
this.userFilename = userFilename
}

/**
* Adds a new User into this class
* @param name Name of the User
* @param limit Limit of Book the User can borrow
*
* @return The new User that is just created
*/
fun newUser(name: String, limit: Int): User {
val temp = User(name, id, limit)
users.add(temp)

id++
toJsonFile()

return temp
}

/**
* Looks for the User with the given name
* @param name Name of the User to be found
*
* @return User with the given name
*/
fun getUser(name: String): User {
users
.asSequence()
.filter { it.name == name }
.forEach { return it }

throw NullPointerException()
}

/**
* Looks for a User with the given id
* @param index id of the User to be found
*
* @return User with the given id
*/
fun getUser(index: Int): User {
return search(index, 0, users.size - 1)
}

/**
* Recursive binary search through the array list for the User with the given id
* @param index id of the User to be found
* @param start Starting point to search
* @param end Ending point to search
*
* @return User with the given id
*/
private fun search(index: Int, start: Int, end: Int): User {
if (start == end && users[start].id == index) {
return users[start]
}

if (start >= end) {
throw NullPointerException()
}

val currentId = (start + end) / 2

if (users[currentId].id == index) {
return users[currentId]
} else if (users[currentId].id > index) {
return search(index, start, currentId - 1)
} else {
return search(index, currentId + 1, end)
}
}

/**
* Replacing a User in the array list with a new User
* @param oldUser User to be replaced
* @param newUser User replacing it
*/
fun update(oldUser: User, newUser: User) {
for (i in users.indices) {
val temp = users[i]

if (temp.id == oldUser.id) {
users[i] = newUser
}
}

toJsonFile()
}
}

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