Re: [castor-user] Changed my mind was (Mental block)

Keith Visco Mon, 14 Feb 2005 11:41:32 -0800

Bryan,

You're using "get-name" and "set-name" methods, those need to be "get-method" and "set-method" respectively.

--Keith

Bryan LaPlante wrote:

Ok what am I doing wrong. ServerEvent is a field value for one or more
fields that the control developer wishes to expose an event on. That event
will call the class referenced in the
new ServerEvent(Object source,"methodToCall") constructor. Below is the
mapping entry I am using and after that the error given by the Marshaller.

ContextListener extends EventListener and has a uniqueID that must be
implemented, the above source object becomes that listener.

<class name="org.xoscript.server.event.ContextListener" identity="uniqueID"
auto-complete="true" verify-constructable="false">

<field name="uniqueID" type="java.lang.String"/>

</class>

<class name="org.xoscript.server.event.ServerEvent">

<field name="target" type="java.lang.String" direct="false">

<bind-xml name="target" node="attribute" />

</field>

<field name="name" type="java.lang.String" direct="false">

<bind-xml name="name" node="attribute" />

</field>

<field name="uniqueID" type="java.util.EventListener" collection="set"
direct="false" get-name="getListeners" set-name="setListeners" >

<bind-xml name="listener" reference="true" node="element" />

</field>

</class>

Here is the error:

org.exolab.castor.mapping.MappingException: The method getUniqueID in class
org.xoscript.server.event.ServerEvent accepting/returning object of type
interface java.util.Set was not found

at
org.exolab.castor.mapping.loader.MappingLoader.createFieldHandler(MappingLoa
der.java:923)

at
org.exolab.castor.mapping.loader.MappingLoader.createFieldDesc(MappingLoader
.java:752)

at
org.exolab.castor.xml.XMLMappingLoader.createFieldDesc(XMLMappingLoader.java
:338)

at
org.exolab.castor.mapping.loader.MappingLoader.createFieldDescs(MappingLoade
r.java:615)

at
org.exolab.castor.mapping.loader.MappingLoader.createDescriptor(MappingLoade
r.java:438)

at
org.exolab.castor.xml.XMLMappingLoader.createDescriptor(XMLMappingLoader.jav
a:202)

at
org.exolab.castor.mapping.loader.MappingLoader.loadMapping(MappingLoader.jav
a:289)

at org.exolab.castor.mapping.Mapping.getResolver(Mapping.java:291)

at org.exolab.castor.mapping.Mapping.getResolver(Mapping.java:246)

at org.exolab.castor.xml.Marshaller.setMapping(Marshaller.java:523)

at org.xoscript.server.Application.writeXML(Application.java:145)

at org.xoscript.test.CreateXML.main(CreateXML.java:48)

----- Original Message -----

From: "Keith Visco" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Monday, February 14, 2005 4:55 AM
Subject: Re: [castor-user] Changed my mind was (Mental block)


Bryan,

Have you thought about using an ID/IDREF approach?

In the mapping file you can specify an identity field for a class:

<class name="MyClass" identity="id">
   <field name="id" ...>
   ...
</class>

Then whatever fields use the MyClass you can mark them as references:

<class name="SomeOtherClass">
    <field name="myClass" type="MyClass">
     <bind-xml reference="true" node="attribute"/>
    </field>
    ...
</class>

--Keith


Bryan LaPlante wrote:

I hate the idea that I came up with and I have a better one, but I will


need

some help to point me in the right direction or come up with a better


way.

Let me know if I need to move this to the developer list.
Concern
ing object references. To instances that have already been created
but are referred to in many places in the output xml, I need a way to


reuse

the instances already created. Upon unmarshalling I need only one


instance

of an object created for ever setter and adder method that expects it.

Create an interface that tells the Marshaller that I want to temporarily
store a reference to all created objects.

public interface ReferenceObject{
   public Hashtable references = new HashTable();
   public Object getReference(int hashCode);
   public void addReference(int hash, Object ref);
   public boolean hasReference(int hash);
}

Now my root object implements this interface so that Marshaller knows it

has

a place to store references. As the xml is being created you store each
instance received from the getValue or convertUponGet method if used in

the

Hashtable.
In addition to the normal xml output expected will be the tags


representing

the Hashtable with the hasCode as the key and the xsi:type or classPath

or

even null indicating to the unmarshaller that the instance has not yet


been

created.
When the Unmarshaller is given the xml it will populate the hastable


first

and then before every tag is converted into an object, check to see if

the

hascode in the tag refers to an instance in the hastable that already


exists

and use that instance to populate the setValue or convertUponGet if used
instead of creating yet another instance of the object.
I can come close to doing this by using the GeneralizedFieldHandler


except

that I am creating an API and the (user) developer will have to carry

the

baton and continue this for his or her own classes, I would like to make
this functionality available while expecting a minimum of effort from

the

developer.

What do you think.

Bryan LaPlante

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Re: [castor-user] Changed my mind was (Mental block)

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