@Override
public void load(final Runnable onSuccess, final ICallback<Pair<String, Throwable>> onFailure) {
String paramName = PageObjectParamNameMap.getInstance().get(CourseSelection.class);
final Integer courseId = pageParams.getInt(paramName);
if (courseId == null) {
onFailure.call(new Pair<String, Throwable>("No course id specified", null));
} else {
RPC.getCoursesAndProblemsService.getCourses(
new AsyncCallback<Course[]>() {
@Override
public void onFailure(Throwable caught) {
onFailure.call(new Pair<String, Throwable>("Could not load course", caught));
}
@Override
public void onSuccess(Course[] result) {
Course course = null;
for (Course c : result) {
if (c.getId() == courseId.intValue()) {
course = c;
break;
}
}
if (course == null) {
onFailure.call(
new Pair<String, Throwable>("User is not registered for course", null));
} else {
// Add CourseSelection to session, and continue
session.add(new CourseSelection(course, null));
onSuccess.run();
}
}
});
}
}
@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();
}
}
});
}
}
@Override
public void load(final Runnable onSuccess, final ICallback<Pair<String, Throwable>> onFailure) {
final Integer userId =
pageParams.getInt(PageObjectParamNameMap.getInstance().get(UserSelection.class));
if (userId == null) {
onFailure.call(new Pair<String, Throwable>("No user id specified", null));
return;
}
// Special case: if the requested user id is the logged-in user's id,
// then we succeed trivially. (A user can always access his/her
// own information, such as a submission history.)
User loggedInUser = session.get(User.class);
if (loggedInUser.getId() == userId.intValue()) {
GWT.log("User self-selection");
UserSelection userSelection = new UserSelection();
userSelection.setUser(loggedInUser);
session.add(userSelection);
onSuccess.run();
return;
}
// General case: a user is being selected among all users in the course.
// Users registered in the course should already have been loaded
User[] regUserList = session.get(User[].class);
// Check to see if the user is registered in the course
for (User userInCourse : regUserList) {
if (userInCourse.getId() == userId.intValue()) {
// Huzzah!
UserSelection userSelection = new UserSelection();
userSelection.setUser(userInCourse);
session.add(userSelection);
onSuccess.run();
return;
}
}
// User is not registered in course
onFailure.call(
new Pair<String, Throwable>("User " + userId + " is not registered in the course", null));
}