CourseGradesToSpreadsheetConverter (gradebook-service-hibernate 22.3 API)

```
public interface CourseGradesToSpreadsheetConverter
```
Interface to let institutions intercept course grade spreadsheet download requests.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`List<List<Object>>`	`getSpreadsheetData(List<EnrollmentRecord> enrollments, CourseGrade courseGrade, Map<String,CourseGradeRecord> gradesMap, List<String> fields)`	This method is called by the Course Grade UI after gathering filtered enrollment records and course grade records, and before actually formatting and downloading the XLS or CSV file.

- Method Detail
  - getSpreadsheetData
```
List<List<Object>> getSpreadsheetData(List<EnrollmentRecord> enrollments,
                                      CourseGrade courseGrade,
                                      Map<String,CourseGradeRecord> gradesMap,
                                      List<String> fields)
```
    This method is called by the Course Grade UI after gathering filtered enrollment records and course grade records, and before actually formatting and downloading the XLS or CSV file. Customized implementations could, for example, call out to the course management service and change or add columns to the generic data table which is sent on to be formatted.
    
    Parameters:
    
    enrollments -
    
    courseGrade -
    
    gradesMap - a map of student UIDs to grade records
    
    Returns:
    
    a spreadsheet-like list of rows, each of which is a list of column values; the first row should contain header strings