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From Dmitri Plotnikov <dplot...@yahoo.com>
Subject RE: Customizing JXPath. Custom Containers.
Date Wed, 09 Oct 2002 15:50:59 GMT
Kenneth,

There is no separate document for this, but there are several examples:
see all classes in the ..jxpath.ri.model subtree - you have there
implementations for beans, DOM, JDOM, collections, containers etc.

- Dmitri


--- Kenneth Petersen <kpetersen@travis.com> wrote:
> Dmitri,
> 
> It is not possible to change the code generated by Castor. Therefore
> I will
> try to implement
> a NodePointer-NodeIterator-NodePointerFactory. Are there any examples
> or
> documentation that
> may help me in this endeavour.
> 
> Best Regards
> Kenneth Petersen
> 
> > -----Original Message-----
> > From: Dmitri Plotnikov [mailto:dplotnik@yahoo.com]
> > Sent: 9. oktober 2002 16:52
> > To: Jakarta Commons Developers List
> > Subject: Re: Customizing JXPath. Custom Containers.
> > 
> > 
> > Kenneth,
> > 
> > I am not familiar with Castor enough to give you specific
> > recommendations, but here are some general ideas.
> > 
> > 1. The mapping of paths to objects in JXPath is based on the
> JavaBean
> > specification.  So, I guess I would first look into flattening
> > properties to make the beans conform strictly to the JavaBean 
> > spec. For
> > example, if Request had a method like
> > 
> > public Errors getErrors(){
> >    return getRequestChoice().getErrors();
> > }
> > 
> > you could get the Errors object (or null) with the
> "/request/errors"
> > path.
> > 
> > 2. If adding code to the Castor-genned classes is not an option,
> you
> > might consider writing a
> NodePointer-NodeIterator-NodePointerFactory
> > familiy of classes for specific support of Castor-style objects. 
> This
> > may be a little involved, as APIs of those classes, especially
> > NodePointer, are rather wide.  You might be able to inherit your
> > implementations from BeanPointer, etc, thus re-using some of the
> > JavaBean support for the Castor object.
> > 
> > Let me know if any of this helps.
> > 
> > - Dmitri
> > 
> > 
> > --- Kenneth Petersen <kpetersen@travis.com> wrote:
> > > Hi. 
> > > 
> > > I am using Castor for creating java objects capable of containing
> > > data
> > > conforming to certain xsd-schemas. When using Castor to 
> > create a java
> > > structure capable of containing data of xml entities following
> > > schema:
> > > 
> > > 	<xs:element name="Request">
> > > 		<xs:complexType>
> > > 			<xs:sequence>
> > > 				<xs:choice>
> > > 					<xs:element name="Success"
> > > type="SuccessType"/>
> > > 					<xs:element name="Errors"
> > > type="ErrorsType"/>
> > > 				</xs:choice>
> > > 			</xs:sequence>
> > > 		</xs:complexType>
> > > 	</xs:element>
> > > 
> > > Castor creates a "Request" class containing a "RequestChoice"
> > > container
> > > containing either a "Success" or "Errors" object.
> > > 
> > > I would like to use JXPath to access the data of the java objects
> > > using
> > > X-Path expressions identifying values of the original xml-entity.
> > > Taking the
> > > example from before, I would like to use expression 
> > "/Request/Errors"
> > > to
> > > access the "Errors" children of an xml-entity. I am not capable
> of
> > > doing
> > > this without being able to configure JXPath so that properties of
> > > classes
> > > "Xxx" following the naming pattern "XxxChoice" are identifies as
> > > being
> > > containers. Is this at all possible? If so some clues as to how
> this
> > > is
> > > accomplished would be much appreciated.
> > > 
> > > Best Regards
> > > Kenneth Petersen
> > > 
> > > 
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> > 
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