autoanswerobserver.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 java.net.*;

/* This class proivides the media call observer for the Auto Reply Application. 

Class:AutoAnswerObserver-Class to detect the call made by caller
Methods:
		hangupConnection():This method is used to disconnect the phone connection
		setJtapiVariables(): This method is used to initialize the terminal connection objects.
*/


	public class AutoAnswerObserver implements MediaCallObserver,Runnable
		{
			boolean isAnswering = false;
			AutoAnswerGUI replyApp = null;
			Call phoneCall = null;
			private Connection connections[] = null;
			private TerminalConnection tconnection = null;
			private TerminalConnection desttconnection = null;
			Thread t=null;
			AnswerText st=null;


		/* Public constructor takes the object of AutoAnswerGUI class as parameter. 
			AutoAnswerObserver():
			Parameters:
					replyApp:object of AutoAnswerGUI
			Return Type:NA
		*/

	public AutoAnswerObserver(AutoAnswerGUI replyApp)
		{
				this.replyApp = replyApp;
		}

	private void setJtapiVariables(Call c)
		{
				phoneCall = c;
				try
				{

					connections = c.getConnections();
					TerminalConnection[] tc;
					phoneCall.addObserver(this);
					tc = connections[0].getTerminalConnections();
					tconnection = tc[0];
					Terminal terminal = tconnection.getTerminal();
					terminal.addCallObserver(this);                

					/* Creating the remote terminal connection. The remote connection is the origination connection which is 
						always the first connection in the connections array. 
					*/
					tc = connections[1].getTerminalConnections();
					desttconnection = tc[0];
				}
				catch(Exception e)
				{
					System.out.println("Exception occurred in setJtapiVariables(): " + e.toString());
				}
		}    

	/* The callChangedEvent() method is called every time an event associated with the phone call is raised. 
		Parameters:Array of CallEv class eventList
		Return Type:void


	*/

	public void callChangedEvent(CallEv[] eventList)
		{
			if(phoneCall == null)
				{
					setJtapiVariables(eventList[0].getCall());
				}
			
			for (int i = 0; i < eventList.length; i++) 
				{
					CallEv ev = eventList[i];
					TerminalConnection terminalConnection = ((TermConnEv)ev).getTerminalConnection();
					MediaTerminalConnection mtc = (MediaTerminalConnection)terminalConnection;

					switch(ev.getID())
						{
						case TermConnCreatedEv.ID:
								try 
								{
									/* Specifying the audio file that is to be played when terminal connection is created. */
								
									System.out.println("Connection Created. ");
									mtc.useDefaultSpeaker();
									mtc.useDefaultMicrophone();
									mtc.usePlayURL(new URL("file:helloworld.wav"));
									isAnswering = false;
								}
							catch (Exception excp) 
								{
									System.out.println("Exception TermConnCreatedEv: " + excp.toString());
								}
								break;

						case TermConnRingingEv.ID:
								try 
								{
										System.out.println("Ringing");
									if(isAnswering == false)
										{
											/* Answering the phone call. */
											isAnswering = true;
											terminalConnection.answer();
											t=new Thread(this,"Node action");
											t.start();
							
										}
								}
								catch (Exception excp) 
								{
									System.out.println("Exception occurred while answering the phone call: " + excp.toString());
								}
								break;

						case MediaTermConnAvailableEv.ID:
									try 
										{
											System.out.println("Media Term Connection Available event. ");
											mtc.startPlaying();
										}
										catch (Exception excp) 
										{
											System.out.println("Exception occurred in startPlaying(): " + excp.toString());
										}
										break;

						case MediaTermConnStateEv.ID:
									try 
									{
										/* Check if playing is done. */
										int state = mtc.getMediaState();
										System.out.println("Playing"+state);
										state = state & MediaTerminalConnection.PLAYING;
										System.out.println("Playing"+state);
										if (state == 0) 
											{
											/* Stop playing and closing the phone connection. */
												mtc.stopPlaying();
											}
									}
									catch (Exception excp) 
										{
											System.out.println("Exception occurred in stopPlaying(): " + excp.toString());
										}
									break;

						case MediaTermConnUnavailableEv.ID:
									try
									{
										/* Specifying that the Media Termjinal Connection is not available. */
										System.out.println("Media terminal connection is not available. ");
										mtc.stopPlaying();
									}
									catch(Exception e)
									{
											System.out.println("Exception occurred in MediaTermConnUnavailableEv.ID: " + e.toString());
									}
									break;

									default:
									break;
						}
					}
			}

			/*Run method to speak the answer
				Parameters:NA
				Return Value:Void

			*/ 
		public void run()
			{
				/*
				Initialize a new object of AnswerText class
				*/
				st=new AnswerText("Thank You for calling me i would glade to say hello","kevin16");
				/*
				Invoke the answerSelText() method of AnswerText class
				*/
				st.answerSelText(this);
				
			}

	}