autoanswergui.java

Creating the Auto Answering Machine Application

/*
Import required JTAPI calsses
*/
import javax.telephony.*;
import javax.telephony.events.*;
import javax.telephony.media.*;
import javax.telephony.media.events.*;
import javax.swing.*;

/*
Import required swing and awt calsses
*/
import java.awt.event.*;
import javax.swing.event.*;
import java.awt.*;

/* This class extends the JFrame class and provides the GUI for the Auto Answer application. 

Class:AutoAnswerGUI-GUI for the Auto Answer application
Methods:
		buildGUI():Used to create GUI
		terminate():Closes the application.
		
*/




	public class AutoAnswerGUI extends JFrame implements ActionListener
		{
				/* Declaring the GUI variables. */
				
				Container cont = null;
				JButton getProvider_button, onoff_button, addlist_button, removelist_button,exit;
				
				JComboBox lines_combo;
				JMenu file_menu;
				JMenuItem exit_menuitem;
				String audioFilePath = null;
				
				/* Declaring the JTAPI variables. */
				
				AutoAnswerObserver replyObserver = null;
				Provider myprovider = null;
				JtapiPeer peer = null;
				Terminal terminal = null;
				

				/* Public constructor takes the title string as parameter.

				Public constructor takes the String parameter. 
				AutoAnswerGUI():
				Parameters:
					title:Title of window
				Return Type:NA

				*/
			
			public AutoAnswerGUI(String title)
				{
					super(title);
					setSize(380, 310);
					addWindowListener(new WindowAdapter()
					{
					public void windowClosing(WindowEvent we)
						{
							terminate();
						}
					});

						replyObserver = new AutoAnswerObserver(this);
						lines_combo = new JComboBox();
				
						/* Creating the provider by obtaining the XTAPI implementation of JTAPI. */
									try{
										
										peer = JtapiPeerFactory.getJtapiPeer("net.xtapi.XJtapiPeer");
									/* Obtaining the default provider of the selected implementation. */
									
									myprovider = peer.getProvider(null);
									Terminal []terminals = myprovider.getTerminals();
									System.out.println("Terminal"+terminals);

									for(int i = 0; i < terminals.length; i++)
										{
											lines_combo.insertItemAt(terminals[i], i);
											lines_combo.setSelectedIndex(0);
											terminal = (Terminal)lines_combo.getSelectedItem();
										}
								}
							catch (Exception excp) 
								{
										excp.printStackTrace();
										JOptionPane.showMessageDialog(this, "Unable to get the provider.");
								}




						buildGUI();
						setVisible(true);
			}

			/* This method is used to build the GUI of the Auto Answer application. 
				Parameters:NA
				Return Value:void

			
			*/
			
			public void buildGUI()
				{
					cont = getContentPane();
					cont.setLayout(null);
					cont.setBackground(Color.white);
					
					JLabel label = new JLabel("Select a provider from the given list");
					
					label.setBounds(10,10,380,20);
					cont.add(label);
					lines_combo.setBounds(10,35, 235,20);
					lines_combo.addActionListener(this);
					cont.add(lines_combo);
					onoff_button = new JButton("Start Service");
					onoff_button.addActionListener(this);
					exit=new JButton("Exit");
					exit.setBounds(230, 220, 130, 20);
					onoff_button.setBounds(230, 180, 130, 20);
					exit.addActionListener(this);
					cont.add(onoff_button);
					cont.add(exit);
				}

		/* This method invokes when end user clicks on any button provided in the user interface. */

			public void actionPerformed(ActionEvent ae)
				{
				
					 if (ae.getSource() == exit)
							{
								System.exit(0);
							}
					
					else if (ae.getSource() == lines_combo)
					{
							try
							{
									if (terminal != null)
									{
									/* Removing the call observer object associated with that terminal. */

									terminal.removeCallObserver(replyObserver);
									}

									/* Instantiate the terminal object. */
									terminal = (Terminal)lines_combo.getSelectedItem();
							}
							catch (Exception e)
							{
								JOptionPane.showMessageDialog(this, "Unable to add the call observer to the selected terminal.");
							}
					}

							/* Checking if user clicks the Start Service or Stop Service button. */
				
					else if (ae.getSource() == onoff_button)
						{
								try
								{
										if (onoff_button.getText().equals("Start Service"))
										{
												if (terminal == null)
												{
													JOptionPane.showMessageDialog(this, "Please select a provider.", "Error", JOptionPane.ERROR_MESSAGE);
													return;
												}

												terminal.addCallObserver(replyObserver);
												System.out.println("Service Started");
										}
										else
										{
										/* If user clicks the Stop Service button, then remove the call observer from the selected terminal and set the text of the button to Start Service. */
															
												terminal.removeCallObserver(replyObserver);
												onoff_button.setText("Start Service");
												System.out.println("Service Stopped");
										}
								}
								catch (Exception ex)
								{
										System.out.println("Exception occurred while add and removing the call observer to the selected terminal. " + ex.toString());
								}
						}
				}


					/* Used to terminate the application. 
						Parameters:NA
						Return Value:Void

					*/
						
				public void terminate()
					{
						System.exit(0);
					}

				/* Main method. */

				public static void main(String[] args) 
					{
						AutoAnswerGUI frame = new AutoAnswerGUI("Auto Answering Machine Application");
					}
	}