[xsl] Xalan Java Extension questions.

["Sudhir Malhotra" <sudhirmalhotra123 at hotmail dot com>]

Hi:

I would highly appreciate any suggestions, or pointers to web based 
resources or java/xsl code samples.  I have gone through Xalan-Java 
extensions examples.


----------INPUT XML-------------
<?xml version="1.0" encoding="UTF-8"?>
<reply>
	<source name="NYSE">
		<entries grouping="instrument" numberOfTimeUnits="60" resultTZ="ET" 
segmentEnd="15:00:00" segmentStart="08:30:00" 
timeRangeEnd="20000929-15:00:00 ET" timeRangeStart="20000929-09:30:00 ET" 
timeUnit="minutes">
                ... Lots of other stuff ...
		</entries>
	</source>
</reply>
----------INPUT XML end------------------------
I would like to instantiate java Date object
in my java code as follows.

-----------JAVA CODE snippet----------------------
// This is just sample code to show our approach

public void transformInputXml()
{
  Date timeRangeStart;


  // source has Input XML
  // target has Output XML
  // transformer uses createOutputAndGetStartDate.xsl

  createOutputAndGetStartDate = new StreamSource(new File(
                                createOutputAndGetStartDate.xsl ));
  TransformerFactory tFactory = TransformerFactory.newInstance();


  Transformer transformer = tFactory.newTransformer
                                  (createOutputAndGetStartDate);
  transformer.transform(source, target);

  // I am able to get my target XML
  // I can create the timeRangeStart Date object
  // inside createOutputAndGetStartDate.xsl
  // QUESTION 1. : I  do not
  // know how to get the Date object created in XSL context
  // back to Java context and so that it prints
  // "September 29, 2000 ... " per the next line.
  // I am constrained not to make timeRangeStart static.
  // I my case I need the transformation to go on
  // to plot the stock prices coming from the market, and
  // I need also need the Date value returned to me
  // in the java context, without
  // making another call through the transformer

  System.out.println ( timeRangeStart.toString() );

  // QUESTION 2. : How to create a complex object in Java
  // context and pass it to xsl
  // I am able to pass a string object
  // transformer.setParameter("PersonName",  "Joe" );           						       
   // <xsl:param name="PersonName" select="anonymous"/>
  // How to pass a Person object, containing all its
  // members?


  // QUESTION 3.
  // In case the Input XML is an error response instead
  // of the data requested, I need to capture the
  // Error code and reason per the INPUT XML 2 below.
  // Currently I get TransformerException.
  // I added the following lines to xsl
  // <xsl:template match="reply/source/Error">
  // <xsl:message terminate="yes"/>
//	<!--<xsl:text><xsl:value-of select="@reason"/></xsl:text>-->
//	<xsl:text>Error received from source</xsl:text>
  // </xsl:template>
  // I am not able to get the @reason value back to Java context
  // so that I can inform the user what happened.
  // Neither can I get the error message I inserted within xsl:text
  // tag



}
------------JAVA CODE Snippet end-------------

----------INPUT XML 2------------------
<?xml version="1.0" encoding="UTF-8"?>
<reply>
  <source name="NYSE">
    <Error code="-300" reason="Connection failed" />
  </source>
</reply>
----------INPUT XML  2 end------------------------


Any help would be greatly appreciated.

Thank you.

Sudhir Malhotra
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