private function getArchiveId($archiveDate, $archiveId)
{
if (!isset($this->archiveIdMap[$archiveDate][$archiveId])) {
$sequence = new Sequence($this->targetDb->prefixTable('archive_numeric_' . $archiveDate), $this->targetDb->getAdapter(), $this->targetDb->prefixTable(''));
if (!$sequence->exists()) {
$sequence->create();
}
$this->archiveIdMap[$archiveDate][$archiveId] = $sequence->getNextId();
}
return $this->archiveIdMap[$archiveDate][$archiveId];
}
