/*
* 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: CollectionTable.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.RetentionPolicy.RUNTIME;
/**
* Specifies the table that is used for the mapping of
* collections of basic or embeddable types. Applied
* to the collection-valued field or property.
*
* <p>By default, the columns of the collection table that correspond
* to the embeddable class or basic type are derived from the
* attributes of the embeddable class or from the basic type according
* to the default values of the <code>Column</code> annotation. In the case
* of a basic type, the column name is derived from the name of the
* collection-valued field or property. In the case of an embeddable
* class, the column names are derived from the field or property
* names of the embeddable class.
* <ul>
* <li> To override the default properties of the column used for a
* basic type, the <code>Column</code> annotation is used on the
* collection-valued attribute in addition to the
* <code>ElementCollection</code> annotation.
*
* <li> To override these defaults for an embeddable class, the
* <code>AttributeOverride</code> and/or
* <code>AttributeOverrides</code> annotations can be used in
* addition to the <code>ElementCollection</code> annotation. If the
* embeddable class contains references to other entities, the default
* values for the columns corresponding to those references may be
* overridden by means of the <code>AssociationOverride</code> and/or
* <code>AssociationOverrides</code> annotations.
* </ul>
*
* <p> If the <code>CollectionTable</code> annotation is missing, the
* default values of the <code>CollectionTable</code> annotation
* elements apply.
*
* <pre>
* Example:
*
* @Embeddable public class Address {
* protected String street;
* protected String city;
* protected String state;
* ...
* }
*
* @Entity public class Person {
* @Id protected String ssn;
* protected String name;
* protected Address home;
* ...
* @ElementCollection // use default table (PERSON_NICKNAMES)
* @Column(name="name", length=50)
* protected Set<String> nickNames = new HashSet();
* ...
* }
*
* @Entity public class WealthyPerson extends Person {
* @ElementCollection
* @CollectionTable(name="HOMES") // use default join column name
* @AttributeOverrides({
* @AttributeOverride(name="street",
* column=@Column(name="HOME_STREET")),
* @AttributeOverride(name="city",
* column=@Column(name="HOME_CITY")),
* @AttributeOverride(name="state",
* column=@Column(name="HOME_STATE"))
* })
* protected Set<Address> vacationHomes = new HashSet();
* ...
* }
* </pre>
*
* @see ElementCollection
* @see AttributeOverride
* @see AssociationOverride
* @see Column
*
* @since Java Persistence 2.0
*/
@Target( { METHOD, FIELD })
@Retention(RUNTIME)
public @interface CollectionTable {
/**
* (Optional) The name of the collection table. If not specified,
* it defaults to the concatenation of the name of the containing
* entity and the name of the collection attribute, separated by
* an underscore.
*/
String name() default "";
/**
* (Optional) The catalog of the table. If not specified, the
* default catalog is used.
*/
String catalog() default "";
/**
* (Optional) The schema of the table. If not specified, the
* default schema for the user is used.
*/
String schema() default "";
/**
* (Optional) The foreign key columns of the collection table
* which reference the primary table of the entity. The default
* only applies if a single join column is used. The default is
* the same as for <code>JoinColumn</code> (i.e., the
* concatenation of the following: the name of the entity; "_";
* the name of the referenced primary key column.) However, if
* there is more than one join column, a <code>JoinColumn</code>
* annotation must be specified for each join column using the
* <code>JoinColumns</code> annotation. In this case, both the
* <code>name</code> and the <code>referencedColumnName</code>
* elements must be specified in each such
* <code>JoinColumn</code> annotation.
*/
JoinColumn[] joinColumns() default {};
/**
* (Optional) Unique constraints that are to be placed on the
* table. These are only used if table generation is in effect.
*/
UniqueConstraint[] uniqueConstraints() default {};
}