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package javax.persistence;

import java.lang.annotation.Target;
import static java.lang.annotation.ElementType.*;
import java.lang.annotation.Retention;
import static java.lang.annotation.RetentionPolicy.*;

/**
 * Expresses a dependency on an {@link EntityManager} persistence context.
 *
 * @since Java Persistence 1.0
 */

@Target({TYPE, METHOD, FIELD})
@Retention(RUNTIME)
public @interface PersistenceContext {

    /**
     * The name by which the entity manager is to be accessed in the 
     * environment referencing context, and is not needed when dependency 
     * injection is used.
     */
    String name() default "";

    /**
     * The name of the persistence unit. If the unitName element is 
     * specified, the persistence unit for the entity manager that 
     * is accessible in JNDI must have the same name.
     */
    String unitName() default "";

    /**
     * Specifies whether this is a transaction-scoped persistence context 
     * or an extended persistence context.
     */
    PersistenceContextType type() default PersistenceContextType.TRANSACTION;

    /**
     * Used to specify properties for the container or persistence
     * provider.  Vendor specific properties may be included in this
     * set of properties.  Properties that are not recognized by
     * a vendor are ignored.  
     */ 
    PersistenceProperty[] properties() default {};
}