Pawel's BookGUI

BookGUI.java

package pawel.bookshelf;

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

/**
 * This class creates the GUI for the BooShelf. There are methods for creating main frame,
 * top menu, add book dialog box, saving book data to the bookshelf.
 * 
 * @author  Pawel Makulski
 * @version 1.0 Beta
 */


public class BookGUI extends JFrame implements ActionListener {

	private static final long serialVersionUID = 1L;

	private BookShelf bookList;

	private JFrame mainFrame;
	private JDialog bookDialog;
	private JLabel authorLabel, costLabel, titleLabel, publisherLabel, yearLabel, welcomeLabel;
	private JTextField authorTF, costTF, titleTF, publisherTF, yearTF;
	private JButton saveButton, cancelButton, okButton, clearButton;

	public static void main ( String[] args ) {

		new BookGUI();

	}

	/**
     * GUI constructor that creates main frame and book varialbes (by calling their methods) and also initiates bookList.
     */
	
	public BookGUI() {

		createMainFrame();
		createBookVariables();
		bookList = new BookShelf();

	}

    /**
     * This method creates the mainFrame of type JFrame and its content pane.
     * It also creates and displays the label containing a brief description of the program.     
     * 
     */
	
	public void createMainFrame() {

		mainFrame = new JFrame(("BookShelfGUI"));
		mainFrame.setTitle("Pawel's Bookshelf Manager");
		mainFrame.setDefaultCloseOperation(EXIT_ON_CLOSE);
		mainFrame.setSize(600, 150);
		mainFrame.setResizable(true);

		Container mainContentPane = mainFrame.getContentPane();

		JLabel welcomeLabel = new JLabel("Welcome to Pawel's Bookshelf manager. Please use the options in the top menu to operate it.", JLabel.CENTER);
		mainContentPane.add(welcomeLabel);

		createMenu(mainFrame);

		mainFrame.setVisible(true);
	}

    /**
     * Top Menu creator.
     * 
     * @param frame The frame we want to create the menu for.
     */	
	
	private void createMenu(JFrame frame)
	{
		JMenuBar topmenu = new JMenuBar();
		frame.setJMenuBar(topmenu);

		// create file menu

		JMenu fileMenu = new JMenu("File");
		topmenu.add(fileMenu);

		JMenuItem quitFileMenuItem = new JMenuItem("Quit");
		quitFileMenuItem.addActionListener(this);
		fileMenu.add(quitFileMenuItem);

		// create Bookshelf menu       

		JMenu bookMenu = new JMenu("Bookshelf");
		topmenu.add(bookMenu);

		JMenuItem addBookItem = new JMenuItem("Add book...");
		addBookItem.addActionListener(this);
		bookMenu.add(addBookItem);

		JMenuItem bookshelfSizeItem = new JMenuItem("Bookshelf size");
		bookshelfSizeItem.addActionListener(this);
		bookMenu.add(bookshelfSizeItem);

		JMenuItem bookshelfCostItem = new JMenuItem("Bookshelf cost");
		bookshelfCostItem.addActionListener(this);
		bookMenu.add(bookshelfCostItem);

		JMenuItem mostExpensiveBookItem = new JMenuItem("Most expensive book");
		mostExpensiveBookItem.addActionListener(this);
		bookMenu.add(mostExpensiveBookItem);

		// create help menu

		JMenu helpMenu = new JMenu("Help");
		topmenu.add(helpMenu);

		JMenuItem aboutItem = new JMenuItem("About");
		aboutItem.addActionListener(this);
		helpMenu.add(aboutItem);        
	} 

    /**
     * Method invoking events depending on the actions performed.
     * 
     * @param e Event
     */
	
	public void actionPerformed(ActionEvent e) {
		String selectedOption = e.getActionCommand(); 

		if (selectedOption.equals("About"))

		{

			JOptionPane.showMessageDialog(mainFrame,
			"This BookShelf GUI was created by Pawel Makulski.");

		}

		else if (selectedOption.equals("Add book..."))

		{

			addBookDialog();
		}


		else if (selectedOption.equals("Bookshelf size"))

		{

			if (bookList.sizeOfBookshelf() == 1) {

				JOptionPane.showMessageDialog(null, "The bookshelf contains one book.");

			}

			else

			{

				JOptionPane.showMessageDialog(null, "The bookshelf contains " + bookList.sizeOfBookshelf() + " books.");

			}

		}

		// Display a dialog box with bookshelf cost info

		else if (selectedOption.equals("Bookshelf cost"))

		{

			JOptionPane.showMessageDialog(null, "The cummulative price of all books on the bookshelf is " + bookList.costOfBookshelf());
		}


		else if (selectedOption.equals("Most expensive book"))

		{

			JOptionPane.showMessageDialog(null, "The most expensive book on the bookshelf costs " + bookList.highestPricePaid());

		}


		// Buttons

		else if (e.getSource() == saveButton) 

		{
			saveBook();

		} 

		else if (e.getSource() == okButton) 

		{
			saveBook();
			clear();
			close();

		} 


		else if (e.getSource() == cancelButton) 

		{
			clear();	
			close();
		} 

		else if (e.getSource() == clearButton) {

			clear();
		}


		else if (selectedOption.equals("Quit"))

		{

			System.exit(0);

		} 



	}



    /**
     * Fetches user's input from the text fields, validates it and saves it to the bookshelf.
     * 
     */

	public void saveBook() {

		String author = authorTF.getText();
		String title = titleTF.getText();
		String cost = costTF.getText();
		String publisher = publisherTF.getText();
		String year = yearTF.getText();


		try {

			Double.parseDouble(costTF.getText());
		}

		catch (Exception e) {

			JOptionPane.showMessageDialog(null, "Cost must be a numeric value!");
			costTF.setText("");

		}

		try {

			Integer.parseInt(yearTF.getText());
		}

		catch (Exception e) {

			JOptionPane.showMessageDialog(null, "Please use the correct year format!");
			yearTF.setText("");

		}

		if (authorTF.getText().equals("")) {
			JOptionPane.showMessageDialog(null,
			"Please enter author name.");
		} 

		else if (titleTF.getText().equals("")) {
			JOptionPane.showMessageDialog(null,
			"Please enter book title.");
		}

		else if (publisherTF.getText().equals("")) {
			JOptionPane.showMessageDialog(null,
			"Please enter publisher name.");
		}

		else {

			bookList.addBook(new Book(title, author, Integer.parseInt(year), publisher, Double.parseDouble(cost)));
			JOptionPane.showMessageDialog(null, "Book successfully added to bookcase.");
			clear();
		}

	}

    /**
     * Closes the Add Book dialog.
     * 
     */

	public void close(){

		bookDialog.dispose();

	}	
	
    /**
     * Creates and displays the Add Book dialog.
     * 
     */
		
	public void addBookDialog(){


		bookDialog = new JDialog(mainFrame, "Add new book");
		bookDialog.setSize(400, 150);
		bookDialog.setModal(true);
		bookDialog.setDefaultCloseOperation(DISPOSE_ON_CLOSE);

		Container bookContentPane = bookDialog.getContentPane();
		bookContentPane.setLayout(new BorderLayout());

		// Panel for Text fields and labels
		
		JPanel bookInfoPanel = new JPanel();
		bookInfoPanel.setLayout(new GridLayout(5,2));
		bookContentPane.add(bookInfoPanel, BorderLayout.CENTER);

		// Panel for Buttons
		
		JPanel bookButtonPanel = new JPanel();
		bookButtonPanel.setLayout(new GridLayout(4,1));
		bookContentPane.add(bookButtonPanel, BorderLayout.EAST);

		// Add text fields and labels to the panel
		
		bookInfoPanel.add(authorLabel);
		bookInfoPanel.add(authorTF);
		bookInfoPanel.add(titleLabel);
		bookInfoPanel.add(titleTF);
		bookInfoPanel.add(publisherLabel);
		bookInfoPanel.add(publisherTF);
		bookInfoPanel.add(yearLabel);
		bookInfoPanel.add(yearTF);
		bookInfoPanel.add(costLabel);
		bookInfoPanel.add(costTF);

		// Add buttons to the panel
		
		bookButtonPanel.add(saveButton);
		bookButtonPanel.add(okButton);
		bookButtonPanel.add(cancelButton);
		bookButtonPanel.add(clearButton);

		// Action listeners for buttons
		
		saveButton.addActionListener(this);
		okButton.addActionListener(this);
		cancelButton.addActionListener(this);
		clearButton.addActionListener(this);

		bookDialog.setVisible(true);

	}

    /**
     * Initiates variables used by the Add Book dialog.
     * 
     */
	
	public void createBookVariables() {

		// Create labels
		
		authorLabel = new JLabel("Author", JLabel.CENTER);
		costLabel = new JLabel("Cost", JLabel.CENTER);
		titleLabel = new JLabel("Title", JLabel.CENTER);
		publisherLabel = new JLabel("Publisher", JLabel.CENTER);
		yearLabel = new JLabel("Year", JLabel.CENTER);

		// Create text fields
		
		authorTF = new JTextField(50);
		costTF = new JTextField(10);
		titleTF = new JTextField(50);
		publisherTF = new JTextField(50);
		yearTF = new JTextField(4);

		// Create buttons
		
		saveButton = new JButton("Save");
		okButton = new JButton("OK");
		cancelButton = new JButton("Cancel");
		clearButton = new JButton("Clear");



	}

    /**
     * Resets the values of the Add Book dialog text fields.
     * 
     */
	
	public void clear() {

		// Clear textfields
		
		authorTF.setText("");
		costTF.setText("");
		titleTF.setText("");
		publisherTF.setText("");
		yearTF.setText("");


	}

}