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/*
* Copyright (c) 2008, 2020 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0,
* or the Eclipse Distribution License v. 1.0 which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
*/
// Contributors:
// Linda DeMichiel - 2.1
// Linda DeMichiel - 2.0
package jakarta.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 jakarta.persistence.ConstraintMode.PROVIDER_DEFAULT;
/**
* Supports composite map keys that reference entities.
* The MapKeyJoinColumns annotation groups
* MapKeyJoinColumn annotations. When the
* MapKeyJoinColumns annotation is used, both the
* name and the referencedColumnName
* elements must be specified in each of the grouped
* MapKeyJoinColumn annotations.
*
* @see MapKeyJoinColumn
* @see ForeignKey
*
* @since 2.0
*/
@Target( { METHOD, FIELD })
@Retention(RUNTIME)
public @interface MapKeyJoinColumns {
/**
* (Required) The map key join columns that are used to map to the entity
* that is the map key.
*/
MapKeyJoinColumn[] value();
/**
* (Optional) Used to specify or control the generation of a
* foreign key constraint when table generation is in effect.
* If both this element and the foreignKey
* element of any of the MapKeyJoinColumn
* elements are specified, the behavior is undefined. If no
* foreign key annotation element is specified in either
* location, the persistence provider's default foreign key
* strategy will apply.
*
* @since 2.1
*/
ForeignKey foreignKey() default @ForeignKey(PROVIDER_DEFAULT);
}