jakarta.xml.bind.annotation.XmlRootElement Maven / Gradle / Ivy
/*
* Copyright (c) 2004, 2020 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0, which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package jakarta.xml.bind.annotation;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import static java.lang.annotation.ElementType.TYPE;
/**
* Maps a class or an enum type to an XML element.
*
* Usage
*
* The @XmlRootElement annotation can be used with the following program
* elements:
*
* - a top level class
* - an enum type
*
*
* See "Package Specification" in jakarta.xml.bind.package javadoc for
* additional common information.
*
*
* When a top level class or an enum type is annotated with the
* @XmlRootElement annotation, then its value is represented
* as XML element in an XML document.
*
*
This annotation can be used with the following annotations:
* {@link XmlType}, {@link XmlEnum}, {@link XmlAccessorType},
* {@link XmlAccessorOrder}.
*
*
* Example 1: Associate an element with XML Schema type
*
* // Example: Code fragment
* @XmlRootElement
* class Point {
* int x;
* int y;
* Point(int _x,int _y) {x=_x;y=_y;}
* }
*
*
*
* //Example: Code fragment corresponding to XML output
* marshal( new Point(3,5), System.out);
*
*
* {@code
*
*
*
* 3
* 5
*
* }
*
* The annotation causes an global element declaration to be produced
* in the schema. The global element declaration is associated with
* the XML schema type to which the class is mapped.
*
* {@code
*
*
*
*
*
*
* }
*
*
*
* Example 2: Orthogonality to type inheritance
*
*
* An element declaration annotated on a type is not inherited by its
* derived types. The following example shows this.
*
* // Example: Code fragment
* @XmlRootElement
* class Point3D extends Point {
* int z;
* Point3D(int _x,int _y,int _z) {super(_x,_y);z=_z;}
* }
*
* //Example: Code fragment corresponding to XML output *
* marshal( new Point3D(3,5,0), System.out );
* {@code
*
*
*
*
* 3
* 5
* 0
*
*
*
*
*
*
*
*
*
*
*
* }
*
* Example 3: Associate a global element with XML Schema type
* to which the class is mapped.
*
* //Example: Code fragment
* @XmlRootElement(name="PriceElement")
* public class USPrice {
* @XmlElement
* public java.math.BigDecimal price;
* }
* {@code
*
*
*
*
*
* }
*
* @author Sekhar Vajjhala, Sun Microsystems, Inc.
* @since 1.6, JAXB 2.0
*/
@Retention(RUNTIME)
@Target({TYPE})
public @interface XmlRootElement {
/**
* namespace name of the XML element.
*
* If the value is "##default", then the XML namespace name is derived
* from the package of the class ( {@link XmlSchema} ). If the
* package is unnamed, then the XML namespace is the default empty
* namespace.
*/
String namespace() default "##default";
/**
* local name of the XML element.
*
* If the value is "##default", then the name is derived from the
* class name.
*
*/
String name() default "##default";
}