RosterStudentDTOService.java

package edu.ucsb.cs156.frontiers.services;

import java.io.IOException;

import java.io.OutputStream;

import java.io.OutputStreamWriter;

import java.io.Writer;

import java.nio.charset.StandardCharsets;

import java.util.List;

import java.util.stream.Collectors;

import java.util.stream.StreamSupport;

import com.opencsv.bean.StatefulBeanToCsv;

import com.opencsv.bean.StatefulBeanToCsvBuilder;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Service;

import edu.ucsb.cs156.frontiers.entities.RosterStudent;

import edu.ucsb.cs156.frontiers.models.RosterStudentDTO;

import edu.ucsb.cs156.frontiers.repositories.RosterStudentRepository;

@Service

    @Autowired

    private RosterStudentRepository rosterStudentRepository;

    /**

     * This method gets a list of RosterStudentDTOs based on the courseId

     * 

     * @param courseId if of the course

     * @return a list of RosterStudentDTOs

     */

    public List<RosterStudentDTO> getRosterStudentDTOs(Long courseId) {

    }

    public StatefulBeanToCsv<RosterStudentDTO> getStatefulBeanToCSV(Writer writer) throws IOException {

    }

}

Mutations