javax.persistence.MapKeyJoinColumns Maven / Gradle / Ivy

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package javax.persistence;

import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

import java.lang.annotation.Retention;
import java.lang.annotation.Target;

/**
 * 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
 * 
 * @since Java Persistence 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();
}