com.jmethods.catatumbo

Annotation Type Entity

@Retention(value=RUNTIME)
 @Target(value=TYPE)
public @interface Entity

Specifies that a class is an entity. Classes with this annotation can be managed by the EntityManager to save objects to the Cloud Datastore and load objects from the Cloud Datastore.

Classes annotated with this annotation must adhere to the following rules:

• Must have a public no-arg (zero arguments) constructor.
• Must have exactly one field annotated with @Identifier annotation.
• The identifier field must be a primitive long, Long or String.
• May contain zero or more fields. All fields that need to be persisted to the Cloud Datastore must have public accessor methods.
• If a field is to be skipped by the EntityManager, it needs to have @ Ignore annotation.
• May have no more than one field with @Key annotation which will hold the full key to the entity.
• Field annotated with @Key must have a data type of DatastoreKey .
• May have no more than one field with @ParentKey annotation which will hold the full key to the parent entity.
• Field annotated with @ParentKey must have a data type of DatastoreKey.
• May have zero or more embedded objects with an annotation of @Embedded.
• All other fields can be any of the types for which a Mapper exists. The framework provides Mappers for various commonly used types. CustomMappers can be specified using MapperFactory.setDefaultMapper(java.lang.reflect.Type, Mapper) or PropertyMapper annotation.

Author:

Sai Pullabhotla

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element and Description
String	kind Specifies the entity kind (equivalent to table name).

Element Detail

kind

public abstract String kind

Specifies the entity kind (equivalent to table name). If not specified, the kind defaults to unqualified name of the entity class.

Returns:

the entity kind

Default:

""