@Override
public void load(final Runnable onSuccess, final ICallback<Pair<String, Throwable>> onFailure) {
String paramName = PageObjectParamNameMap.getInstance().get(Problem.class);
final Integer problemId = pageParams.getInt(paramName);
if (problemId == null) {
onFailure.call(new Pair<String, Throwable>("No problem id specified", null));
} else {
CourseSelection courseSelection = session.get(CourseSelection.class);
RPC.getCoursesAndProblemsService.getProblems(
courseSelection.getCourse(),
new AsyncCallback<Problem[]>() {
@Override
public void onFailure(Throwable caught) {
onFailure.call(new Pair<String, Throwable>("Could not get problem", caught));
}
public void onSuccess(Problem[] result) {
Problem problem = null;
for (Problem p : result) {
if (p.getProblemId().equals(problemId)) {
problem = p;
break;
}
}
if (problem == null) {
onFailure.call(new Pair<String, Throwable>("No such problem", null));
} else {
// Add the Problem to the session and continue
session.add(problem);
onSuccess.run();
}
}
});
}
}
/**
* Check whether logged-in user is an instructor in the selected course.
*
* @param courseSelection the selected course
* @param courseRegList course registrations for logged-in user
* @return true if the logged-in user is an instructor in the selected course, false otherwise
*/
private static boolean isInstructor(
CourseSelection courseSelection, CourseAndCourseRegistration[] courseRegList) {
boolean isInstructor = false;
for (CourseAndCourseRegistration reg : courseRegList) {
if (reg.getCourse().getId() == courseSelection.getCourse().getId()) {
isInstructor = reg.getCourseRegistration().getRegistrationType().isInstructor();
break;
}
}
return isInstructor;
}
@Override
public void activate(final Session session, final SubscriptionRegistrar subscriptionRegistrar) {
UserSelection selectedUser = session.get(UserSelection.class);
CourseSelection courseSelection = session.get(CourseSelection.class);
// activate views
statusMessageView.activate(session, subscriptionRegistrar);
userProgressView.activate(session, subscriptionRegistrar);
// Display top label (username and course)
StringBuilder buf = new StringBuilder();
buf.append("Progress for ");
buf.append(selectedUser.getUser().getUsername());
buf.append(" in ");
buf.append(courseSelection.getCourse().getName());
topLabel.setText(buf.toString());
// Add back/logout handlers
pageNavPanel.setLogoutHandler(new LogoutHandler(session));
pageNavPanel.setBackHandler(new PageBackHandler(session));
}
public void loadProblemsForCourse(final CourseSelection courseSelection) {
GWT.log(
"Loading problems and submission receipts for course "
+ courseSelection.getCourse().getNameAndTitle());
SessionUtil.loadProblemAndSubmissionReceiptsInCourse(page, courseSelection, page.getSession());
}