public Set<String> getSupportedAttributeNames() {
        return Collections.<String>emptySet();
    }
Returns the names of all attributes explicitly supported by this object.
Attributes named here have associated mappings within the backing model
object, and thus should not be included in the arbitrary attribute
storage. Any attributes set which do not match these names, such as those
set via other extensions, will be added to arbitrary attribute storage.

@return
    A read-only Set of the names of all attributes explicitly supported
    (mapped to a property of the backing model) by this object.
extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-base/src/main/java/org/apache/guacamole/auth/jdbc/base/ModeledDirectoryObject.java