com.datastax.driver.mapping.annotations

Annotation Type Frozen

@Target(value=FIELD)
 @Retention(value=RUNTIME)
public @interface Frozen

Specifies that the field decorated with this annotation maps to a CQL type that is frozen, or contains frozen subtypes.

This annotation is purely informational at this stage, the validity of the declaration is not checked. But will become useful when a schema generation feature is added to the mapper. Therefore it is a good idea to keep frozen declarations up-to-date.

See Also:

FrozenKey, FrozenValue

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element and Description
String	value Contains the full CQL type of the target column.

Element Detail

value

public abstract String value

Contains the full CQL type of the target column. As a convenience, this can be left out when only the top-level type is frozen.

Examples:

 // Will map to frozen<user>
 @Frozen
 private User user;

 @Frozen("map<text, map<text, frozen<user>>>")
 private Map<String, Map<String, User>> m;
 

Also consider the @FrozenKey and @FrozenValue shortcuts for simple collections.

Returns:

the full CQL type of the target column.

Default:

""