Giving to @XmlJavaTypeAdapter a generic type value

Hi all
I have a critical problem with adapters used at jaxb unmarshall
some of my fields have type enumeration. I decided that is best to use same adapter class for all enums so i created a generic enumeration adapter. I'm not sure if is 100% ok but here it is:
EnumerationAdapter.java :
public class EnumerationAdapter<T extends Enum<T> > extends XmlAdapter<String, Enum<?>> {
    private Class<T> _enumClass;
     * (non-Javadoc)
     * @see javax.xml.bind.annotation.adapters.XmlAdapter#marshal(java.lang.Object)
    @Override
    public String marshal(Enum<?> e) throws Exception {
        return e.toString();
     * (non-Javadoc)
     * @see javax.xml.bind.annotation.adapters.XmlAdapter#unmarshal(java.lang.Object)
    @Override
    public Enum<?> unmarshal(String v) throws Exception {
        // TODO Auto-generated method stub
        return T.valueOf(_enumClass, value);
}The adapter is called at unmarshall but i can't set type T as i want.
The problem is how i declare @XmlJavaTypeAdapter annotation that.
It should be something like this.
@XmlJavaTypeAdapter(EnumerationAdapter<MyEnum>.class)
protected MyEnum field;Of course syntactically is wrong, but i don't know how to declare it correctly. I.m not sure if at least this is possible.
Also i've noticed that i have to give explicit types to annotations ( not like xxx.getClass() ) :(
So I'm in deep d***, please do try to help me.
Thanks all.
Best regards
Marian

I was using it until i discovered a nasty issue
On short: I'm developing an suite of applications that receive an xml command(validated with a xsd schema), unmarshall it in a class. Then do a lot of stuff and then marshall back in xml structure then send it further.
The issue was that i have differentiate an empty xmle element from a missing one. So for tags that are not present is all ok, those xml elements will be ignored and in clas object them will have null value. All good for now.
But if i receive an empty xml element ( this means that i have to set null value for that field in a database...), i have to unmarshall this xml element into a "special" value(different from null) in order to know that i have to recreate empty tag for this element when i marshal object class back into xml command.
So i decided that that fastest solution is to use custom adapters and unmarshall empty tags into null strings for strings ( no [problem here), MININT value for numeric elements; and elements of type enum to use a convention enumfield NULL_VALUE (that i add for every enumeration).
I know that this solution is far from the best but for me i think is the fastest, and this is what matters for me now.
A better solution was to add for every element ( or at least for all non string elements) a field indicator that i set to true when xml element is present and false when is not).
These fields may be regular class members or even annotation for members.
This i can do easily cos all my schema and my classes are generated automatically ( open architecture projects or xjc), and for additionals fields or annotations i can use jaxb plugins, but i have to customize marshall/unmarshall process.
I'm not very familiar with this so it probably will take me at least day or two and i cannot afford to lose even an hour without an concrete result. :(
Hope i wasn't very ambiguous in presentation.
If u have any advice for me please do post it. Thanks again and have a nice day.
Edited by: grandanat on Apr 30, 2009 8:05 AM

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