final NamedParameterJdbcOperations namedJdbc = getDbConnector().getJdbcTemplate();
// Get version metadata from the data-points and set up a Manageable HTS accordingly
// While the HTS doc itself might have been deleted, the data-points can still be retrieved here
final String sqlVersion = getElSqlBundle().getSql("SelectDataPointsVersion", args);
ManageableHistoricalTimeSeries result = namedJdbc.query(sqlVersion, args, new ManageableHTSExtractor(oid));
if (result == null) {
// No data-points were found, check if the time-series doc exists or existed at some point
final String sqlExists = getElSqlBundle().getSql("SelectExistential", args);
result = namedJdbc.query(sqlExists, args, new ManageableHTSExtractor(oid));
if (result != null) {
// The time series doc exists or existed at some point, it's just that there are no data-points
result.setTimeSeries(ImmutableLocalDateDoubleTimeSeries.EMPTY_SERIES);
return result;
} else {
// The time series with the supplied id never existed
throw new DataNotFoundException("Unable to find time-series: " + objectId);
}
}
// Set up query arguments to limit the number of points to return
if (filter.getMaxPoints() == null) {
// return all points (limit all)
args.addValue("order", "ASC");
} else if (filter.getMaxPoints() > 0) {
// return first few points
args.addValue("paging_fetch", filter.getMaxPoints());
args.addValue("order", "ASC");
} else if (filter.getMaxPoints() < 0) {
// return last few points
args.addValue("paging_fetch", -filter.getMaxPoints());
args.addValue("order", "DESC");
} else {
// Zero datapoints requested
result.setTimeSeries(ImmutableLocalDateDoubleTimeSeries.EMPTY_SERIES);
return result;
}
// Get the actual data points and attach to the Manageable HTS
if (filter.getLatestDate() == null || filter.getEarliestDate() == null || !filter.getLatestDate().isBefore(filter.getEarliestDate())) {
final String sqlPoints = getElSqlBundle().getSql("SelectDataPoints", args);
final LocalDateDoubleTimeSeries series = namedJdbc.query(sqlPoints, args, new DataPointsExtractor());
result.setTimeSeries(series);
} else {
//TODO: this is a hack, most of the places that call with this condition want some kind of metadata, which it would be cheaper for us to expose specifically
result.setTimeSeries(ImmutableLocalDateDoubleTimeSeries.EMPTY_SERIES);
}
return result;
}