javax.xml.bind.annotation.XmlElementDecl Maven / Gradle / Ivy
Show all versions of jaxb-api-osgi Show documentation
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2004-2011 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package javax.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.METHOD;
/**
* Maps a factory method to a XML element.
*
* Usage
*
* The annotation creates a mapping between an XML schema element
* declaration and a element factory method that returns a
* JAXBElement instance representing the element
* declaration. Typically, the element factory method is generated
* (and annotated) from a schema into the ObjectFactory class in a
* Java package that represents the binding of the element
* declaration's target namespace. Thus, while the annotation syntax
* allows @XmlElementDecl to be used on any method, semantically
* its use is restricted to annotation of element factory method.
*
* The usage is subject to the following constraints:
*
*
* - The class containing the element factory method annotated
* with @XmlElementDecl must be marked with {@link
* XmlRegistry}.
* - The element factory method must take one parameter
* assignable to {@link Object}.
*
*
* Example 1: Annotation on a factory method
*
* // Example: code fragment
* @XmlRegistry
* class ObjectFactory {
* @XmlElementDecl(name="foo")
* JAXBElement<String> createFoo(String s) { ... }
* }
*
*
* <!-- XML input -->
* <foo>string
*
* // Example: code fragment corresponding to XML input
* JAXBElement o =
* (JAXBElement)unmarshaller.unmarshal(aboveDocument);
* // print JAXBElement instance to show values
* System.out.println(o.getName()); // prints "{}foo"
* System.out.println(o.getValue()); // prints "string"
* System.out.println(o.getValue().getClass()); // prints "java.lang.String"
*
* <!-- Example: XML schema definition -->
* <xs:element name="foo" type="xs:string"/>
*
*
* Example 2: Element declaration with non local scope
*
* The following example illustrates the use of scope annotation
* parameter in binding of element declaration in schema derived
* code.
*
* The following example may be replaced in a future revision of
* this javadoc.
*
*
* <!-- Example: XML schema definition -->
* <xs:schema>
* <xs:complexType name="pea">
* <xs:choice maxOccurs="unbounded">
* <xs:element name="foo" type="xs:string"/>
* <xs:element name="bar" type="xs:string"/>
* </xs:choice>
* </xs:complexType>
* <xs:element name="foo" type="xs:int"/>
* </xs:schema>
*
*
* // Example: expected default binding
* class Pea {
* @XmlElementRefs({
* @XmlElementRef(name="foo",type=JAXBElement.class)
* @XmlElementRef(name="bar",type=JAXBElement.class)
* })
* List<JAXBElement<String>> fooOrBar;
* }
*
* @XmlRegistry
* class ObjectFactory {
* @XmlElementDecl(scope=Pea.class,name="foo")
* JAXBElement createPeaFoo(String s);
*
* @XmlElementDecl(scope=Pea.class,name="bar")
* JAXBElement createPeaBar(String s);
*
* @XmlElementDecl(name="foo")
* JAXBElement createFoo(Integer i);
* }
*
*
* Without scope createFoo and createPeaFoo would become ambiguous
* since both of them map to a XML schema element with the same local
* name "foo".
*
* @see XmlRegistry
* @since JAXB 2.0
*/
@Retention(RUNTIME)
@Target({METHOD})
public @interface XmlElementDecl {
/**
* scope of the mapping.
*
*
* If this is not {@link XmlElementDecl.GLOBAL}, then this element
* declaration mapping is only active within the specified class.
*/
Class scope() default GLOBAL.class;
/**
* namespace name of the XML element.
*
* If the value is "##default", then the value is the namespace
* name for the package of the class containing this factory method.
*
* @see #name()
*/
String namespace() default "##default";
/**
* local name of the XML element.
*
*
* Note to reviewers: There is no default name; since
* the annotation is on a factory method, it is not clear that the
* method name can be derived from the factory method name.
* @see #namespace()
*/
String name();
/**
* namespace name of a substitution group's head XML element.
*
* This specifies the namespace name of the XML element whose local
* name is specified by substitutionHeadName().
*
* If susbtitutionHeadName() is "", then this
* value can only be "##default". But the value is ignored since
* since this element is not part of susbtitution group when the
* value of susbstitutionHeadName() is "".
*
* If susbtitutionHeadName() is not "" and the value is
* "##default", then the namespace name is the namespace name to
* which the package of the containing class, marked with {@link
* XmlRegistry }, is mapped.
*
* If susbtitutionHeadName() is not "" and the value is
* not "##default", then the value is the namespace name.
*
* @see #substitutionHeadName()
*/
String substitutionHeadNamespace() default "##default";
/**
* XML local name of a substitution group's head element.
*
* If the value is "", then this element is not part of any
* substitution group.
*
* @see #substitutionHeadNamespace()
*/
String substitutionHeadName() default "";
/**
* Default value of this element.
*
*
* The
'\u0000'
value specified as a default of this annotation element
* is used as a poor-man's substitute for null to allow implementations
* to recognize the 'no default value' state.
*/
String defaultValue() default "\u0000";
/**
* Used in {@link XmlElementDecl#scope()} to
* signal that the declaration is in the global scope.
*/
public final class GLOBAL {}
}