package push;import push.Winner;import members.Members;import javax.servlet.*;import javax.servlet.http.*;import java.io.*;import java.util.*;/** * A class that demonstrates a push service for recommending a site to a friend * (by a push message). *  * @version 1.0 * @since 1.0 * @see HttpServlet */public final class Recommendation extends HttpServlet {	private static final String XML_VERSION = "<?xml version=\"1.0\"?>";	private static final String CONTENT_TYPE = "text/vnd.wap.wml";	private static final String DOC_TYPE = "<!DOCTYPE wml PUBLIC \"-//WAPFORUM//DTD WML 1.1//EN\"\n"			+ "  \"http://www.wapforum.org/DTD/wml_1.1.xml\">";	private static int numberOfQuestions = 0;	private static String grades;	private static final Vector questions = new Vector();	private static final String HOME_PAGE = "/index.jsp";	private static String feedbackFile = null;	private static Winner winner = null;	private static String pushAddressType = null;	/**	 * <code>doGet</code>	 * 	 * @param request	 *            a <code>HttpServletRequest</code> value	 * @param response	 *            a <code>HttpServletResponse</code> value	 * @exception ServletException	 *                if an error occurs	 * @exception IOException	 *                if an error occurs	 */	public void doGet(HttpServletRequest request, HttpServletResponse response)			throws ServletException, IOException {		doPost(request, response);	}	/**	 * <code>doPost</code>	 * 	 * @param request	 *            a <code>HttpServletRequest</code> value	 * @param response	 *            a <code>HttpServletResponse</code> value	 * @exception ServletException	 *                if an error occurs	 * @exception IOException	 *                if an error occurs	 */	public void doPost(HttpServletRequest request, HttpServletResponse response)			throws ServletException, IOException {		/* Session tracking. See the description in index.jsp */		HttpSession session = request.getSession();		boolean cookiesCheck = request.getHeader("cookie") != null				&& request.isRequestedSessionIdValid();		final String jsessionID = cookiesCheck ? "" : ";jsessionid="				+ session.getId();		String action = request.getParameter("action");		if (action == null)			action = "";		pushAddressType = Members.getPushAddressType();		/* start generating the response ... */		response.setContentType(CONTENT_TYPE);		/* prevent caching of the response */		response.setHeader("cache-control", "no-cache");		PrintWriter out = response.getWriter();		out.println(XML_VERSION);		out.println(DOC_TYPE);		out.println("<wml>");		out.println("<!-- provides a way back using the prev element -->\n"				+ "<template>" + " <do type=\"prev\">" + "  <prev/>" + " </do>"				+ "</template>");		if (session.getAttribute("name") == null) {			out					.println("<!-- This service can be only accessed by members -->\n"							+ "<card title=\"Members  only\" id=\"thanks\">"							+ " <do type=\"accept\" label=\"Ok\">"							+ "  <go href=\""							+ request.getContextPath()							+ HOME_PAGE							+ jsessionID							+ "\"/>"							+ " </do>"							+ " <p>This service is provided only for members.<br/>"							+ " <anchor title=\"Ok\">Ok"							+ "  <go href=\""							+ request.getContextPath()							+ HOME_PAGE							+ jsessionID							+ "\"/>" + " </anchor>" + " </p>" + "</card>");		} else if (!action.equals("push")) {			out					.println("<!-- Push message form -->\n"							+ "<card title=\"Tell a friend\" id=\"friend\" newcontext=\"true\">"							+ "<p>Tell a friend:<br/>"							+ "Name: <input name=\"name\"/>"							+ (pushAddressType.equals("PLMN") ? "Phone: <input name=\"phone\" format=\"*N\"/>"									: "IP address: <input name=\"ip\"/>")							+ "Message: <input name=\"message\" value=\"Your friend recommends that you visit WML Zoo. See you there!\"/>"							+ "  <anchor title=\"Send push message\">Send push message"							+ "   <go method=\"post\" href=\""							+ request.getRequestURI()							+ jsessionID							+ "\">"							+ "    <postfield name=\"name\" value=\"$(name)\"/>"							+ (pushAddressType.equals("PLMN") ? "    <postfield name=\"phone\" value=\"$(phone)\"/>"									: "    <postfield name=\"ip\" value=\"$(ip)\"/>")							+ "    <postfield name=\"message\" value=\"$(message)\"/>"							+ "    <postfield name=\"action\" value=\"push\"/>"							+ "   </go></anchor>" + "  </p></card>");		} else {			PushInitiator pusher = Members.getInitiator();			/* next, send the push message */			String recommendedUrl = "http://" + request.getServerName() + ":"					+ request.getServerPort() + request.getContextPath();			String pushMessage = request.getParameter("message");			String friendName = request.getParameter("name");			System.out.println("friend = " + friendName);			System.out.println("addresstype = " + pushAddressType);			boolean sended = false;			String message = PushInitiator.createSiMessage(recommendedUrl,					null, null, null, null, pushMessage);			String errorReason = "";			try {				/*				 * Check the default address type. If it is IPv4 then send the				 * message by using the IP address of the friend. If PLMN then				 * send the message to the given phone number. If the address				 * (IP or phone number) is not given, the friend should has				 * currently active session				 */				if (pushAddressType.equals("IPv4")) {					String ip = request.getParameter("ip");					System.out.println("ip= " + ip);					if (ip != null && !ip.trim().equals("")) {						pusher.sendPushMessage(ip, pushAddressType, message,								PushService.SI_CONTENT_TYPE);						System.out.println("Push message sent to address: "								+ ip);						sended = true;					} else {						User friendUser = User.findUser(friendName);						System.out.println("friendUser = " + friendUser);						if (friendUser != null) {							pusher.sendPushMessage(friendUser.getAddress(),									pushAddressType, message,									PushService.SI_CONTENT_TYPE);							System.out.println("Push message sent to address: "									+ friendUser.getAddress());							sended = true;						} else							errorReason = "Your friend " + friendName									+ " is not currently on line!";					}				} else if (pushAddressType.equals("PLMN")) {					String phone = request.getParameter("phone");					System.out.println("phone number= " + phone);					if (phone == null || (phone = phone.trim()).equals("")) {						/*						 * If the phone number is not given, try to find from						 * the database						 */						User friendUser = User.findUser(friendName);						if (friendUser != null)							phone = friendUser.getAddress(pushAddressType);					}					if (phone != null && !(phone = phone.trim()).equals("")) {						pusher.sendPushMessage(phone, pushAddressType, message,								PushService.SI_CONTENT_TYPE);						System.out.println("Push message sent to number: "								+ phone);						sended = true;					} else						errorReason = "phone number is not given?";				} else					throw new Exception("wrong push-addresstype: "							+ pushAddressType);			} catch (Exception e) {				System.err.println(e);				errorReason = e.toString();			}			if (sended) {				out						.println("<!-- Thanks for the recommendation -->\n"								+ "<card title=\"Thank you\" id=\"thanks\">"								+ " <do type=\"accept\" label=\"Ok\">"								+ "  <go href=\""								+ request.getContextPath()								+ HOME_PAGE								+ jsessionID								+ "\"/>"								+ " </do>"								+ " <p>Your message has been delivered.<br/>Thank you for recommending our zoo to your friend!<br/>"								+ " <anchor title=\"Ok\">Ok" + "  <go href=\""								+ request.getContextPath() + HOME_PAGE								+ jsessionID + "\"/>" + " </anchor>" + " </p>"								+ "</card>");			} else {				out						.println("<card title=\""								+ errorReason								+ "\" id=\"error\">"								+ " <do type=\"accept\" label=\"Ok\">"								+ "  <go href=\""								+ request.getContextPath()								+ HOME_PAGE								+ jsessionID								+ "\"/>"								+ " </do>"								+ " <p>Your message has not been delivered.<br/>The possible reason is: "								+ errorReason + " <br/><anchor title=\"Ok\">Ok"								+ "  <go href=\"" + request.getContextPath()								+ HOME_PAGE + jsessionID + "\"/>"								+ " </anchor>" + " </p>" + "</card>");			}		}		out.println("</wml>");	}}