marshall wrapper element that's not present in model

From: Rowland Smith <rowland_at_river2sea.org>
Date: Mon, 30 Jul 2007 15:55:19 -0700 (PDT)

I'm using JAXB 2.1 to go from my domain model to XML (and vice-versa).

Let's say my model is the following, where Install and Remove are subclasses
of AbstractAction:

AbstractAction
  ^
  |
  |--Install
  |--Remove

In the schema that I have to support, the concrete AbstractAction subclasses
are 'wrapped' in an Action element:

<Action>
  <Install refreshInterval="..."/>
</Action>

The domain model has no need for aggregation of an AbstractAction within
some 'Action' class - and I don't want to pollute it with unnecessary
classes just to make it serialize correctly.

What's the correct approach to insert this 'wrapper' Action element which
will contain a real AbstractAction element for Install or Remove when
marshalling to XML?

Unmarshalling?

Is this a job for an XmlAdapter?

Schema example - Note that I can't change the schema.

  <xs:element name="Action">
    <xs:complexType>
      <xs:sequence>
        <xs:choice>
          <xs:element ref="Install"/>
          <xs:element ref="Remove"/>
        </xs:choice>
        <xs:choice>
          <xs:element name="InstallTime" >
            <xs:complexType>
              <xs:attribute name="expire" use="optional" type="xs:time"/>
            </xs:complexType>
          </xs:element>
        </xs:choice>
      </xs:sequence>
      <xs:attribute name="name" use="required" type="xs:string"/>
    </xs:complexType>
  </xs:element>

TIA,
Rowland

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