/**
* Initializes the dispatcher servlet. This sets the post/get to true and calls the abstract setup
* actions method.
*/
@Override
public void init() {
setIsPostAllowed(true);
setIsGetAllowed(true);
try {
setupActionMethods();
} catch (NoSuchMethodException methodEx) {
LogController.write(this, "FATAL: No such method: " + methodEx.getMessage());
return;
} finally {
actionInitialized = true;
}
}
/**
* Processes the request coming to the servlet and grabs the attributes set by the servlet and
* uses them to fire off pre-determined methods set in the setupActionMethods function of the
* servlet.
*
* @param request the http request coming from the browser.
* @param response the http response going to the browser.
* @throws javax.servlet.ServletException
* @throws java.io.IOException
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
if (!actionInitialized) {
LogController.write(this, "This dispatcher servlet is not initialized properly!");
return;
}
if (actionTag == null) {
LogController.write(this, "There is no action attribute tag name!");
return;
}
HttpSession httpSession = request.getSession();
UserSession userSession = (UserSession) httpSession.getAttribute("user_session");
if (userSession == null) {
LogController.write(this, "User session is no longer available in this http session.");
userSession = new UserSession();
// We always want a user session though...
httpSession.setAttribute("user_session", userSession);
}
String action = (String) request.getAttribute(actionTag);
try {
if (action == null) {
// There is no action attribute specified, check parameters.
String external_action = (String) request.getParameter(actionTag);
if (external_action != null) {
Method method = externalActions.get(external_action);
if (method != null) {
LogController.write(this, "Performing external action: " + external_action);
method.invoke(this, new Object[] {userSession, request, response});
} else {
if (defaultExternalMethod != null) {
LogController.write(this, "Performing default external action.");
defaultExternalMethod.invoke(this, new Object[] {userSession, request, response});
} else {
LogController.write(this, "Unable to perform default external action.");
}
}
} else {
if (defaultExternalMethod != null) {
LogController.write(this, "Performing default external action.");
defaultExternalMethod.invoke(this, new Object[] {userSession, request, response});
} else {
LogController.write(this, "Unable to perform default external action.");
}
}
} else {
Method method = internalActions.get(action);
if (method != null) {
LogController.write(this, "Performing internal action: " + action);
method.invoke(this, new Object[] {userSession, request, response});
} else {
if (defaultInternalMethod != null) {
LogController.write(this, "Performing default internal action.");
defaultInternalMethod.invoke(this, new Object[] {userSession, request, response});
} else {
LogController.write(this, "Unable to perform default internal action.");
}
}
request.removeAttribute("application_action");
}
} catch (IllegalAccessException accessEx) {
LogController.write(this, "Exception while processing request: " + accessEx.getMessage());
} catch (InvocationTargetException invokeEx) {
LogController.write(this, "Exception while processing request: " + invokeEx.toString());
invokeEx.printStackTrace();
} catch (Exception ex) {
LogController.write(this, "Unknown exception: " + ex.toString());
}
}