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Hibernate's core ORM functionality

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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
 * See the lgpl.txt file in the root directory or .
 */
package org.hibernate.annotations;

import java.lang.annotation.Retention;
import javax.persistence.Column;
import javax.persistence.FetchType;

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

/**
 * This is the collection-valued form of @Any definitions.  Defines a ToMany-style association pointing
 * to one of several entity types depending on a local discriminator.  See {@link Any} for further information.
 *
 * @see Any
 *
 * @author Emmanuel Bernard
 * @author Steve Ebersole
 */
@java.lang.annotation.Target({METHOD, FIELD})
@Retention(RUNTIME)
public @interface ManyToAny {
	/**
	 * Metadata definition used.
	 * If defined, should point to a @AnyMetaDef name
	 * If not defined, the local (ie in the same field or property) @AnyMetaDef is used
	 */
	String metaDef() default "";

	/**
	 * Metadata dicriminator column description, This column will hold the meta value corresponding to the
	 * targeted entity.
	 */
	Column metaColumn();
	/**
	 * Defines whether the value of the field or property should be lazily loaded or must be
	 * eagerly fetched. The EAGER strategy is a requirement on the persistence provider runtime
	 * that the value must be eagerly fetched. The LAZY strategy is applied when bytecode
	 * enhancement is used. If not specified, defaults to EAGER.
	 */
	FetchType fetch() default FetchType.EAGER;
}