the autoanswergui.java file.txt

Creating the Auto Answering Machine Application

/*Import required JTAPI classes*/
import javax.telephony.*;
import javax.telephony.events.*;
import javax.telephony.media.*;
import javax.telephony.media.events.*;
import javax.swing.*;
/*Import required swing and awt classes*/
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();
      }
      //getProvider_button.setEnabled(false);
   }
   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 A utoAnswerGUI("Auto Answer Application");
}
}