@Retention(value=RUNTIME) @Target(value={FIELD,METHOD}) public @interface XmlIsSet
Sometimes you'd want to map a Java primitive type to an optional element/attribute. Doing this makes it impossible to represent the absence of the property, thus you always end up producing the value when you marshal to XML. For example,
and you get:XmlElement
class Foo {XmlElement
int x; } marshaller.marshal(new Foo());
0
By creating a side boolean field/property that has this annotation, you can indicate the absence of the property by setting this boolean to false.
XmlElement
class Foo {XmlElement
int x;XmlIsSet
("x") boolean xIsPresent; } Foo f = new Foo(); f.x = 5; f.xIsPresent = false; marshaller.marshal(f);f.xIsPresent = true; 5
A property/field annotated with XmlIsSet
itself will not show up in XML.
It is an error to use this annotation on the same property/field
as XmlElement
, XmlAttribute
, XmlValue
, or XmlElementRef
,
...TBD.
public abstract String value
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