Milind Rao wrote:
>
> I just started using Castor to convert Objects to XML and back and have a couple of
> questions
>
> I have the following Objects
>
> public class Member
> {
> private int iID
> private Level iLevel;
>
> // Constructor is package-private
> Member(theMID, int theLID) {iID = theID; iLevel = new Level(theLID);}
> public int getID() {return iID;}
> public Level getLevel() {return iLevel;}
> }
>
> public class Level
> {
> private int iID;
>
> // Constructor is package-private
> Level(int theID) {iID = theID;}
> public int getID() {return iID;}
> }
>
> public class MemberFactory()
> {
> public Member createMember(int theMID, int theLID)
> {return new Member(theMID, theLID);}
> }
>
> I created an xml mapping file
> <mapping>
> <class name="test.Member" verify-constructable="false">
> <map-to xml="MEMBER" />
> <field name="ID" type="java.lang.Integer" >
> <xml name="mid" node="attribute" />
> </field>
> <field name="Level" type="test.Level" >
> <xml name="lid" node="attribute" />
> </field>
> </class>
>
> <class name="test.Level" verify-constructable="false">
> <map-to xml="LEVEL" />
> <field name="Id" type="java.lang.Integer" >
> <xml name="lid" node="attribute" />
> </field>
> </class>
> </mapping>
>
> 1. What I'd like to get on Marshalling a Member is an XML that looks like
> <Member mid="2" lid="2">
> ie. I want the level ID, not the Level object. Do I have to write my own
> FieldHandler for this
> or is there some way to do this in the XML Mapping file?
You can do that in the XML Mapping file...
add reference="true" to the field mapping as such:
<field name="Level" type="test.Level">
<bind-xml name="lid" node="attribute" reference="true"/>
</field>
and make sure you mark the identity field for the test.Level class
mapping:
<class name="test.Level" ... identity="Id"/>
Note: You'll still need at some point to marshal the actual Level
instances, and not just their IDs...otherwise during unmarshalling,
you'll run into problems because the Ids won't be resolvable.
>
> 2. I want to use the MemberFactory for creating the Member.
> Again, I suspect that I have to write my own FieldHandler. Right?
If you want to use your factory, then you'll need to write a
FieldHandler.
>
> 3. I'd really like to see constructors from elements. I don't like to have set
> methods in my
> classes unless really required. So using Castor is making me change my design
> philosophy.
>
> There are no sample files on how to write the FieldHandler. I have gone through the
> archives and got very
> confused. Is there any sample code for FieldHandlers somewhere.
There should be samples in the archives...but I'll place one up on the
FTP server later when I get some time.
--Keith
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