JavaTM 2 Platform Std. Ed. v1.6.0
javax.xml.bind.annotation
Annotation Type XmlElementDecl
@Retention(value=RUNTIME)
@Target(value=METHOD)
public @interface XmlElementDecl
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
XmlRegistry .
- The element factory method must take one parameter
assignable to
Object .
Example 1: Annotation on a factory method
// Example: code fragment
@XmlRegistry
class ObjectFactory {
@XmlElementDecl(name="foo")
JAXBElement<String> createFoo(String s) { ... }
}
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 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: 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".
- Since:
- JAXB 2.0
- See Also:
XmlRegistry
Required Element Summary |
String |
name
local name of the XML element. |
name
public abstract String name
- 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 Also:
namespace()
scope
public abstract Class scope
- scope of the mapping.
If this is not XmlElementDecl.GLOBAL , then this element
declaration mapping is only active within the specified class.
- Default:
- javax.xml.bind.annotation.XmlElementDecl.GLOBAL.class
namespace
public abstract String namespace
- 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 Also:
name()
- Default:
- "##default"
substitutionHeadNamespace
public abstract String substitutionHeadNamespace
- 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 XmlRegistry , is mapped.
If susbtitutionHeadName() is not "" and the value is
not "##default", then the value is the namespace name.
- See Also:
substitutionHeadName()
- Default:
- "##default"
substitutionHeadName
public abstract String substitutionHeadName
- 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 Also:
substitutionHeadNamespace()
- Default:
- ""
defaultValue
public abstract String defaultValue
- Default value of this element.
The ' ' 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.
- Default:
- "\u0000"
Copyright 2003 Sun Microsystems, Inc. All rights reserved
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