/* -------------------- AsyncRequestHandler Interface --------------------- */
public void handle(Message request, Response response) throws Exception {
if (req_handler != null) {
if (req_handler instanceof AsyncRequestHandler)
((AsyncRequestHandler) req_handler).handle(request, response);
else {
Object retval = req_handler.handle(request);
if (response != null) response.send(retval, false);
}
return;
}
Object retval = handle(request);
if (response != null) response.send(retval, false);
}
/** getting the request from the web and handling it. */
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/xml");
// to be sure it isn't cached
response.setHeader("Expires", "Sat, 6 May 1995 12:00:00 GMT");
response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
response.addHeader("Cache-Control", "post-check=0, pre-check=0");
response.setHeader("Pragma", "no-cache");
String rawRequest = request.getParameter(WebConstants.REQUEST);
int requestType = -1;
if (rawRequest == null || rawRequest.trim().length() == 0) {
requestType = 0;
} else
try {
requestType = Integer.parseInt((String) rawRequest);
} catch (Exception e) {
logger.debug(e.getMessage(), e);
requestType = -1;
}
StringBuilder sb = new StringBuilder("<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>\n");
response.getWriter().write(sb.toString());
RequestHandler handler;
if (logger.isDebugEnabled()) logger.debug("Received a request with code : " + requestType);
switch (requestType) {
case 0: // default case pointing to the /org.openiot.gsn
handler = new ContainerInfoHandler();
if (handler.isValid(request, response)) handler.handle(request, response);
break;
case REQUEST_GML: // case pointing to gml (v2) output
handler = new GMLHandler();
if (handler.isValid(request, response)) handler.handle(request, response);
break;
case REQUEST_ONE_SHOT_QUERY:
handler = new OneShotQueryHandler();
if (handler.isValid(request, response)) handler.handle(request, response);
break;
case REQUEST_ONE_SHOT_QUERY_WITH_ADDRESSING:
handler = new OneShotQueryWithAddressingHandler();
if (handler.isValid(request, response)) handler.handle(request, response);
break;
case REQUEST_OUTPUT_FORMAT:
handler = new OutputStructureHandler();
if (handler.isValid(request, response)) handler.handle(request, response);
break;
case REQUEST_ADDRESSING:
handler = new AddressingReqHandler();
if (handler.isValid(request, response)) handler.handle(request, response);
break;
default:
response.sendError(UNSUPPORTED_REQUEST_ERROR, "The requested operation is not supported.");
break;
}
}
/* ------------------------ RequestHandler Interface ---------------------- */
public Object handle(Message msg) throws Exception {
if (req_handler != null) return req_handler.handle(msg);
return null;
}