protected List<Object> getOperationArguments(AggregationOperationContext context) {
List<Object> result = new ArrayList<Object>(values != null ? values.size() : 1);
for (Object element : values) {
if (element instanceof Field) {
result.add(context.getReference((Field) element).toString());
} else if (element instanceof Fields) {
for (Field field : (Fields) element) {
result.add(context.getReference(field).toString());
}
} else if (element instanceof AggregationExpression) {
result.add(((AggregationExpression) element).toDbObject(context));
} else {
result.add(element);
}
}
return result;
}
/* (non-Javadoc)
* @see org.springframework.data.mongodb.core.aggregation.AggregationOperation#toDBObject(org.springframework.data.mongodb.core.aggregation.AggregationOperationContext)
*/
@Override
public DBObject toDBObject(AggregationOperationContext context) {
DBObject dbObject = new BasicDBObject();
dbObject.put(
"groupBy",
groupByExpression == null
? context.getReference(groupByField).toString()
: groupByExpression.toDbObject(context));
if (!outputs.isEmpty()) {
dbObject.put("output", outputs.toDbObject(context));
}
return dbObject;
}
