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A native Java library to talk to the Canvas REST API
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package edu.ksu.canvas.impl;

import com.google.gson.reflect.TypeToken;
import edu.ksu.canvas.interfaces.QuizReader;
import edu.ksu.canvas.interfaces.QuizWriter;
import edu.ksu.canvas.model.assignment.Quiz;
import edu.ksu.canvas.net.Response;
import edu.ksu.canvas.net.RestClient;
import edu.ksu.canvas.oauth.OauthToken;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.lang.reflect.Type;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;

public class QuizImpl extends BaseImpl implements QuizReader, QuizWriter {
    private static final Logger LOG = LoggerFactory.getLogger(QuizImpl.class);

    public QuizImpl(String canvasBaseUrl, Integer apiVersion, OauthToken oauthToken, RestClient restClient,
                    int connectTimeout, int readTimeout, Integer paginationPageSize, Boolean serializeNulls) {
        super(canvasBaseUrl, apiVersion, oauthToken, restClient, connectTimeout, readTimeout,
                paginationPageSize, serializeNulls);
    }

    @Override
    public Optional getSingleQuiz(String courseId, String quizId) throws IOException {
        LOG.debug("Retrieving single quiz {} in course {}", quizId, courseId);
        String url = buildCanvasUrl("courses/" + courseId + "/quizzes/" + quizId, Collections.emptyMap());
        Response response = canvasMessenger.getSingleResponseFromCanvas(oauthToken, url);
        return responseParser.parseToObject(Quiz.class, response);
    }

    @Override
    public List getQuizzesInCourse(String courseId) throws IOException {
        LOG.debug("Getting quizzes for course {}", courseId);
        String url = buildCanvasUrl("courses/" + courseId + "/quizzes", Collections.emptyMap());
        List responses = canvasMessenger.getFromCanvas(oauthToken, url);
        return parseQuizList(responses);
    }

    @Override
    public Optional updateQuiz(Quiz quiz, String courseId) throws IOException {
        LOG.debug("Updating quiz {} in course {}", quiz.getId(), courseId);
        String url = buildCanvasUrl("courses/" + courseId + "/quizzes/" + quiz.getId(), Collections.emptyMap());
        Response response = canvasMessenger.sendJsonPutToCanvas(oauthToken, url,quiz.toJsonObject(serializeNulls));
        return responseParser.parseToObject(Quiz.class, response);
    }

    private List  parseQuizList(final List responses) {
        return responses.stream().
                map(this::parseQuizList).
                flatMap(Collection::stream).
                collect(Collectors.toList());
    }

    private List parseQuizList(final Response response) {
        Type listType = new TypeToken>(){}.getType();
        return GsonResponseParser.getDefaultGsonParser(serializeNulls).fromJson(response.getContent(), listType);
    }

    @Override
    protected Type listType() {
        return new TypeToken>(){}.getType();
    }

    @Override
    protected Class objectType() {
        return Quiz.class;
    }

}