blueflood-core/src/main/java/com/rackspacecloud/blueflood/io/datastax/DAbstractMetricsRW.java
private RollupType getRollupType( Map<Long, Object> tsRollupMap ) {

        if( tsRollupMap.isEmpty() )
            return null;
        else {

            Object value = tsRollupMap.values().iterator().next();
            return value instanceof Rollup ? ( (Rollup) value ).getRollupType() : null;
        }
    }
private RollupType getRollupType( Map<Long, Object> tsRollupMap ) {

        if( tsRollupMap.isEmpty() )
            return null;
        else {

            Object value = tsRollupMap.values().iterator().next();
            return value instanceof Rollup ? ( (Rollup) value ).getRollupType() : null;
        }
    }
Given a map of timestamps -> Rollups/SimpleNumbers, return RollupType, or null, if not a Rollup.

@param tsRollupMap
@return