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//$Id: ManyToOne.java 11282 2007-03-14 22:05:59Z epbernard $

//EJB3 Specification Copyright 2004-2006 Sun Microsystems, Inc.

package javax.persistence;

import java.lang.annotation.Retention;

import java.lang.annotation.Target;

import static java.lang.annotation.ElementType.*;

import static java.lang.annotation.RetentionPolicy.*;

import static javax.persistence.FetchType.*;

/**

 * This annotation defines a single-valued association to another entity class that has

 * many-to-one multiplicity. It is not normally necessary to specify the target entity

 * explicitly since it can usually be inferred from the type of the object being referenced.

 *

 * @author Emmanuel Bernard

 */

@Target({METHOD, FIELD}) @Retention(RUNTIME)

public @interface ManyToOne {

        /**

         * The entity class that is the target of the association.

         *

         * Defaults to the type of the field or property that stores the association

         */

        Class targetEntity() default void.class;

        /**

         * The operations that must be cascaded to the target of the association.

         *

         * By default no operations are cascaded.

         */

        CascadeType[] cascade() default {};

        /**

         * Whether the association should be lazily loaded or must be eagerly fetched.

         * The EAGER strategy is a requirement on the persistence provider runtime that

         * the associated entity must be eagerly fetched. The LAZY strategy is a hint to

         * the persistence provider runtime.

         */

        FetchType fetch() default EAGER;

        /**

         * Whether the association is optional. If set to false then a non-null relationship must always exist.

         */

        boolean optional() default true;

}