/**
* Removes a question from a survey. Takes care of decrementing all subsequent question indices.
*/
public void deleteQuestion(int surveyId, int questionIndex) {
Preconditions.checkArgument(surveyId != 0);
Preconditions.checkArgument(questionIndex >= 0);
int size = countQuestions(surveyId);
if (questionIndex >= size) {
throw new RuntimeException(
"Question index "
+ questionIndex
+ " out of range ("
+ size
+ ")"
+ " for survey "
+ surveyId);
}
delete(SurveyQuestionRecord.getKey(surveyId, questionIndex));
for (int ii = questionIndex + 1; ii < size; ++ii) {
updateQuestionIndex(surveyId, ii, ii - 1);
}
}
/** Utility method to update only the index column of a question. */
protected void updateQuestionIndex(int surveyId, int index, int newIndex) {
updatePartial(
SurveyQuestionRecord.getKey(surveyId, index),
SurveyQuestionRecord.QUESTION_INDEX,
newIndex);
}