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• Inheritance.java

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javax.persistence.Inheritance Maven / Gradle / Ivy

/*
 * Copyright (c) 2008, 2009, 2011 Oracle, Inc. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
 * which accompanies this distribution.  The Eclipse Public License is available
 * at http://www.eclipse.org/legal/epl-v10.html and the Eclipse Distribution License
 * is available at http://www.eclipse.org/org/documents/edl-v10.php.
 */
package javax.persistence;

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

import static java.lang.annotation.ElementType.TYPE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import static javax.persistence.InheritanceType.SINGLE_TABLE;

/**
 * Defines the inheritance strategy to be used for an entity class
 * hierarchy. It is specified on the entity class that is the root of
 * the entity class hierarchy.  If the Inheritance annotation is not
 * specified or if no inheritance type is specified for an entity
 * class hierarchy, the SINGLE_TABLE mapping strategy is used.
 *
 * 
 *
 *   Example:
 *
 *   @Entity
 *   @Inheritance(strategy=JOINED)
 *   public class Customer { ... }
 *
 *   @Entity
 *   public class ValuedCustomer extends Customer { ... }
 * 
 *
 * @since Java Persistence 1.0
 */
@Target({TYPE})
@Retention(RUNTIME)

public @interface Inheritance {

    /** The strategy to be used for the entity inheritance hierarchy. */
    InheritanceType strategy() default SINGLE_TABLE;
}