/*
 * Copyright (c) 2008, 2009 Sun Microsystems. 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.
 *
 * Contributors:
 *     Linda DeMichiel - Java Persistence 2.0 - Version 2.0 (October 1, 2009)
 *     Specification available from http://jcp.org/en/jsr/detail?id=317
 */

// $Id: SequenceGenerator.java 20957 2011-06-13 09:58:51Z stliu $

package javax.persistence;

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

/**
 * Defines a primary key generator that may be referenced by name when
 * a generator element is specified for the {@link GeneratedValue}
 * annotation. A sequence generator may be specified on the entity
 * class or on the primary key field or property. The scope of the
 * generator name is global to the persistence unit (across all
 * generator types).
 *
 * <pre>
 *   Example:
 *
 *   @SequenceGenerator(name="EMP_SEQ", allocationSize=25)
 * </pre>
 *
 * @since Java Persistence 1.0
 */
@Target({ TYPE, METHOD, FIELD })
@Retention(RUNTIME)
public @interface SequenceGenerator {
	/**
	 * (Required) A unique generator name that can be referenced
	 * by one or more classes to be the generator for primary key
	 * values.
	 */
	String name();

	/**
	 * (Optional) The name of the database sequence object from
	 * which to obtain primary key values.
	 * <p> Defaults to a provider-chosen value.
	 */
	String sequenceName() default "";

	/**
	 * (Optional) The catalog of the sequence generator.
	 *
	 * @since Java Persistence 2.0
	 */
	String catalog() default "";

	/**
	 * (Optional) The schema of the sequence generator.
	 *
	 * @since Java Persistence 2.0
	 */
	String schema() default "";

	/**
	 * (Optional) The value from which the sequence object
	 * is to start generating.
	 */
	int initialValue() default 1;

	/**
	 * (Optional) The amount to increment by when allocating
	 * sequence numbers from the sequence.
	 */
	int allocationSize() default 50;
}