/**
* Precondition-style validation that a dataset name is compatible.
*
* @param namespace a String namespace
* @param name a String name
*/
public static void checkDatasetName(String namespace, String name) {
Preconditions.checkNotNull(namespace, "Namespace cannot be null");
Preconditions.checkNotNull(name, "Dataset name cannot be null");
Preconditions.checkArgument(
Compatibility.isCompatibleName(namespace),
"Hive incompatible: Namespace %s is not alphanumeric (plus '_')",
namespace);
Preconditions.checkArgument(
Compatibility.isCompatibleName(name),
"Hive incompatible: Dataset name %s is not alphanumeric (plus '_')",
name);
}
@Override
public DatasetDescriptor update(String name, DatasetDescriptor descriptor) {
Compatibility.checkDatasetName(name);
Compatibility.checkDescriptor(descriptor);
if (!exists(name)) {
throw new DatasetNotFoundException("Table not found: " + name);
}
Table table = getHcat().getTable(HiveUtils.DEFAULT_DB, name);
HiveUtils.updateTableSchema(table, descriptor);
getHcat().alterTable(table);
return descriptor;
}
@Override
public boolean delete(String name) {
Compatibility.checkDatasetName(name);
// TODO: when switching off of HCatalog, this may need to be moved
if (!exists(name)) {
return false;
}
getHcat().dropTable(HiveUtils.DEFAULT_DB, name);
return true;
}
@Override
public boolean exists(String name) {
Compatibility.checkDatasetName(name);
return getHcat().exists(HiveUtils.DEFAULT_DB, name);
}