javax.persistence.MapKeyEnumerated Maven / Gradle / Ivy
// $Id: $
// EJB3 Specification Copyright 2004-2009 Sun Microsystems, Inc.
package javax.persistence;
import java.lang.annotation.Target;
import java.lang.annotation.Retention;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import static javax.persistence.EnumType.ORDINAL;
/**
* Specifies the enum type for a map key whose basic type is an enumerated type.
*
* The MapKeyEnumerated annotation can be applied to an
* element collection or relationship of type java.util.Map, in
* conjunction with the ElementCollection, OneToMany, or
* ManyToMany annotation.
* If the enumerated type is not specified or the MapKeyEnumerated
* annotation is not used, the enumerated type is assumed to be
* ORDINAL.
*
*
* Example:
*
* public enum ProjectStatus {COMPLETE, DELAYED, CANCELLED, IN_PROGRESS}
*
* public enum SalaryRate {JUNIOR, SENIOR, MANAGER, EXECUTIVE}
*
* @Entity public class Employee {
* @ManyToMany
* public Projects<ProjectStatus, Project> getProjects() {...}
*
* @OneToMany
* @MapKeyEnumerated(STRING)
* public Map<SalaryRate, Employee> getEmployees() {...}
* ...
* }
*
*
* @see ElementCollection
* @see OneToMany
* @see ManyToMany
*
* @since Java Persistence 2.0
*/
@Target({METHOD, FIELD}) @Retention(RUNTIME)
public @interface MapKeyEnumerated {
/** (Optional) The type used in mapping a map key enum type. */
EnumType value() default ORDINAL;
}