de.whs.poodle.controllers.student.StudentMcWorksheetController.java Source code

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Here is the source code for de.whs.poodle.controllers.student.StudentMcWorksheetController.java

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/*
 * Copyright 2015 Westflische Hochschule
 *
 * This file is part of Poodle.
 *
 * Poodle is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Poodle is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with Poodle.  If not, see <http://www.gnu.org/licenses/>.
 */
package de.whs.poodle.controllers.student;

import java.util.Collections;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

import de.whs.poodle.beans.Student;
import de.whs.poodle.beans.mc.McQuestionOnWorksheet;
import de.whs.poodle.beans.mc.McWorksheet;
import de.whs.poodle.repositories.McWorksheetRepository;
import de.whs.poodle.repositories.exceptions.NotFoundException;

@Controller
@RequestMapping("student/mcWorksheets/{mcWorksheetId}")
public class StudentMcWorksheetController {

    @Autowired
    private McWorksheetRepository mcWorksheetRepo;

    @RequestMapping
    @PreAuthorize("@studentSecurity.hasAccessToMcWorksheet(authentication.name, #mcWorksheetId)")
    public String get(@ModelAttribute Student student, @PathVariable int mcWorksheetId, Model model) {
        // get the worksheet
        McWorksheet mcWorksheet = mcWorksheetRepo.getByMcWorksheetId(mcWorksheetId);
        if (mcWorksheet == null)
            throw new NotFoundException();

        // get the question that the student has to answer next
        Integer currentQuestionId = mcWorksheetRepo.getCurrentQuestionIdForStudentAndWorksheet(student.getId(),
                mcWorksheetId);

        // no next question, this must mean that the worksheets has been completed, show the results
        if (currentQuestionId == null) {
            return "redirect:/student/multipleChoiceResults/{mcWorksheetId}";
        }

        // get the question
        McQuestionOnWorksheet currentQuestion = mcWorksheet.getQuestions().stream()
                .filter(q -> q.getId() == currentQuestionId).findFirst().orElse(null);

        if (currentQuestion == null)
            throw new RuntimeException(
                    "the current question for this worksheet is not in the worksheet, this shouldn't be possible...");

        // shuffle the answers
        Collections.shuffle(currentQuestion.getQuestion().getAnswers());

        // make sure to set a timestamp for "seen_at"
        mcWorksheetRepo.prepareMcStatistics(student.getId(), mcWorksheet.getCourseTerm().getId(),
                currentQuestion.getId());

        model.addAttribute("worksheet", mcWorksheet);
        model.addAttribute("questionOnWs", currentQuestion);

        return "student/answerMcQuestion";
    }

    @RequestMapping(method = RequestMethod.POST, params = "answer")
    @PreAuthorize("@studentSecurity.hasAccessToMcWorksheet(authentication.name, #mcWorksheetId)")
    public String answerQuestion(@ModelAttribute Student student, @PathVariable int mcWorksheetId,
            @RequestParam List<Integer> answers, Model model) {
        Integer currentQuestionId = mcWorksheetRepo.getCurrentQuestionIdForStudentAndWorksheet(student.getId(),
                mcWorksheetId);
        mcWorksheetRepo.answerQuestion(student.getId(), currentQuestionId, answers);

        // redirect to the same page, we will automatically show the next question
        return "redirect:/student/mcWorksheets/{mcWorksheetId}";

    }
}