/**
* Deserialize only Keyspace attributes without nested ColumnFamilies
*
* @param row Keyspace attributes in serialized form
* @return deserialized keyspace without cf_defs
* @throws IOException if deserialization failed
*/
public static KSMetaData fromSchema(Row row, Iterable<CFMetaData> cfms) throws IOException {
UntypedResultSet.Row result =
QueryProcessor.resultify("SELECT * FROM system.schema_keyspaces", row).one();
try {
return new KSMetaData(
result.getString("name"),
AbstractReplicationStrategy.getClass(result.getString("strategy_class")),
fromJsonMap(result.getString("strategy_options")),
result.getBoolean("durable_writes"),
cfms);
} catch (ConfigurationException e) {
throw new RuntimeException(e);
}
}
/**
* Deserialize ColumnFamilies from low-level schema representation, all of them belong to the same
* keyspace
*
* @param row
* @return map containing name of the ColumnFamily and it's metadata for faster lookup
*/
public static Map<String, CFMetaData> deserializeColumnFamilies(Row row) {
if (row.cf == null) return Collections.emptyMap();
Map<String, CFMetaData> cfms = new HashMap<String, CFMetaData>();
UntypedResultSet results =
QueryProcessor.resultify("SELECT * FROM system.schema_columnfamilies", row);
for (UntypedResultSet.Row result : results) {
CFMetaData cfm = CFMetaData.fromSchema(result);
cfms.put(cfm.cfName, cfm);
}
for (CFMetaData cfm : cfms.values()) {
Row columnRow = ColumnDefinition.readSchema(cfm.ksName, cfm.cfName);
for (ColumnDefinition cd : ColumnDefinition.fromSchema(columnRow, cfm))
cfm.column_metadata.put(cd.name, cd);
}
return cfms;
}