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From Michael Glavassevich <mrgla...@ca.ibm.com>
Subject Re: GSoC - Work Status
Date Wed, 03 Jul 2013 02:04:09 GMT
Hi Samuel,

We're just coming off a holiday weekend here. I'm just getting caught up 
on e-mail.

Hoping to have some time tomorrow to take a look at what you have so far.

Thanks.

Michael Glavassevich
XML Technologies and WAS Development
IBM Toronto Lab
E-mail: mrglavas@ca.ibm.com
E-mail: mrglavas@apache.org

Samuel Medeiros <ccc.samuel@gmail.com> wrote on 07/01/2013 01:06:52 PM:

> Greetings,
> 
> Following the approach suggested by Michael, I have developed the 
> first version of the 'StAX to SAX events' adapter.
> 
> To develop it, I have created a local project (attached) with the 
> following structure:
> org.apache.xalan.stax.StAX2SAXAdapter
> Represents the adapter.
> org.apache.xalan.sax.SAXHandler
> It's the SAX handler. It logs all incoming events into a stack.
> org.apache.xalan.stax.test.StAX2SAXAdapterTest
> It tests the adapter by calling both SAXHandler 
> and StAX2SAXAdapter with a common XML file and verifying that their 
> event stacks are equal.
> org.apache.xalan.stax.resource
> This package contains some XML files used in the tests: xalam.xml, 
> birds.xml and xmark.xml. This last one is not included into the 
> attached .zip file because its size is 35,7 MB. I have generated it 
> using XMark (http://www.xml-benchmark.org/downloads.html).
> 
> As provided in the plan, this week I should study how to implement 
> StAXResult support, but I can also start integrating this adapter 
> into the Xalan code.
> 
> Michael, what do you advise me to do?
> 
> I am looking forward to having your feedback about this adapter.
> 
> Thanks,
> Samuel Queiroz 
> 

> 2013/6/25 Michael Glavassevich <mrglavas@ca.ibm.com>
> Hi Samuel,
> 
> Xerces has partial support for StAX but doesn't yet have an 
implementation
> of XMLStreamReader.
> 
> For testing purposes I'd suggest using Woodstox [1]. It's a popular open
> source StAX implementation which many Apache projects already use.
> 
> There's also a complete implementation of StAX in all versions of Java 
6+,
> so you could use that for testing too.
> 
> Thanks.
> 
> [1] http://woodstox.codehaus.org/
> 
> Michael Glavassevich
> XML Technologies and WAS Development
> IBM Toronto Lab
> E-mail: mrglavas@ca.ibm.com
> E-mail: mrglavas@apache.org

> Samuel Medeiros <ccc.samuel@gmail.com> wrote on 06/25/2013 11:19:00 AM:
> 
> > Hi Michael,
> >
> > Please disconsider my first email in this thread.
> > I was thinking about implement StAX. However, this project is
> > nothing to do with this.
> >
> > I have read the tutorial [1] and the ideas got more clear for me:
> > In fact, what is proposed is to accomplish the XLS Transformation by
> > receiving a StAXSource and sending the result trough a StAXResult.
> >
> > The approach you have proposed in your last message is now clear for
> > me: I have to iterate over the StAXSource by using an XMLEventReader
> > / XMLStreamReader and translate these events to SAX ones.
> >
> > I just have to check how to apply this approach into the code.
> >
> > --
> >
> > I know the implementation is based on the interfaces defined by
> > JAXP. However, for run the samples as well as the tests I will
> > write, we are gonna need an implementation. By default, Xalan uses
> > Xerces. The question is: does Xerces support StAX?
> >
> > Thanks,
> > Samuel
> >
> > [1] http://tutorials.jenkov.com/java-xml/index.html
> 
> > 2013/6/25 Samuel Medeiros <ccc.samuel@gmail.com>
> > Hi Michael,
> >
> > Thanks for this information.
> > I am gonna study exactly how to apply this approach into the source
> code.
> >
> > If I have questions, I will let you know.
> >
> > Sincerely,
> > Samuel
> >
> 
> > 2013/6/24 Michael Glavassevich <mrglavas@ca.ibm.com>
> > Hi Samuel,
> >
> > One approach you could take for StAXSource would be to write a StAX to
> SAX
> > converter. This would take an XMLStreamReader / XMLEventReader as 
input
> > and generate SAX events on to a ContentHandler. You could wire that to
> the
> > TemplatesHandler (org.apache.xalan.processor.StylesheetHandler) 
allowing
> > you to reuse the existing components for building the Templates 
object.
> >
> > Thanks for the update.
> >
> > Michael Glavassevich
> > XML Technologies and WAS Development
> > IBM Toronto Lab
> > E-mail: mrglavas@ca.ibm.com
> > E-mail: mrglavas@apache.org
> >
> > Samuel Medeiros <ccc.samuel@gmail.com> wrote on 06/23/2013 04:30:38 
PM:
> >
> > > Hi Michael,
> > >
> > > I have read the documentation available at the Xalan's website and
> > > also its pointers to XSL/XSLT, XPath and JAXP. I have also run some
> > > samples and did some tracing by adding some prints into the code.
> > >
> > > It's quite clear for me how the things work, but I am not
> > > familiarized enough with the code.
> > >
> > > According to [1], the javax.xml.transform.stax was added to support
> > > StAX. This package consists of the interfaces: TemplatesHandler
> > > and TransformerHandler; and classes: StAXResult and StAXSource.
> > > Also, the packages javax.xml.stream, javax.xml.stream.events and
> > > javax.xml.stream.util were added to support StAX. In addition, the
> > > class Validator have also to accept StAXSource.
> > >
> > > For me, to add StAX support, it would be just implement the
> > > interfaces provided by these packages and plug them into the
> > > existent code. For example, in the
> > > org.apache.xalan.processor.TransformerFactoryImpl's method
> > > newTemplates(Source source), I would add a condition to test if the
> > > source is a StAX one and then create the correct TemplatesHandler
> > > instance, that will create the Templates object.
> > >
> > > I don't know exactly how prepared is Xalan to receive these changes.
> > >
> > > I need help to understand the project's structure. Then I will be
> > > able to do the work of the 2 next weeks (as provided in the plan):
> > > define precisely the changes I will do.
> > >
> > > Sincerely,
> > > Samuel
> > >
> > > [1] http://docs.oracle.com/javase/6/docs/technotes/guides/xml/jaxp/
> > > ReleaseNotes_160.html
> >
> 
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