XMLBeans and XmlCursor

Hi all,

I've just started to use XMLBeans and I had some troubles to
use
XmlCursor to navigate through a document, update it and get
back the
updated version.

This is my xml document:

<?xml version="1.0"
encoding="UTF-8"?>
<eda:quoteEvent xmlns:eda="http://www.bsourc
e.ch/EDA">
	<eda:security>CS GROUP N</eda:security>
	<eda:date>09-03-2007</eda:date>
	<eda:time/>
	<eda:national-nr>1213853</eda:national-nr>
	<eda:change>-0.2</eda:change>
	<eda:volume>5821192</eda:volume>
	<eda:currency
transcoder="CURRENCY">CHF</eda:currency>
	<eda:prev-close>87.9</eda:prev-close>
	<eda:open>87.75</eda:open>
	<eda:last>87.7</eda:last>
</eda:quoteEvent>

I would like to retrieve all nodes with transcoder attribute
(I've used
the //transcoder/.. expression), call another component
(for
transcodification) and get back the below new one:

<?xml version="1.0"
encoding="UTF-8"?>
<eda:quoteEvent xmlns:eda="http://www.bsourc
e.ch/EDA">
	<eda:security>CS GROUP N</eda:security>
	<eda:date>09-03-2007</eda:date>
	<eda:time/>
	<eda:national-nr>1213853</eda:national-nr>
	<eda:change>-0.2</eda:change>
	<eda:volume>5821192</eda:volume>
	<eda:currency
transcoder="CURRENCY">001</eda:currency>
	<eda:prev-close>87.9</eda:prev-close>
	<eda:open>87.75</eda:open>
	<eda:last>87.7</eda:last>
</eda:quoteEvent>

The code is:

  XmlObject xobj = XmlObject.Factory.parse(new
ByteArrayInputStream(bodyEvent.getBytes()));
  XmlObject response = EDATool.transcodification (xobj,
"SMI-EDA");

where

public static XmlObject transcodification (XmlObject
bodyEvent, String
encoder) throws Exception
{
	if ((bodyEvent == null) || (encoder == null))
		throw new Exception("unexpected null object");
	
	long start = System.currentTimeMillis();
	XmlObject[] elems = bodyEvent.execQuery("//transcoder/..");
	System.out.println ("execQuery elapsed time msec:
" +
(System.currentTimeMillis() - start));
	
	for (int i = 0; i < elems.length; i++)
	{
		XmlCursor cursor = elems[i].newCursor();
		TokenType token = null;
		
		String value = cursor.getTextValue();
		String table = null;
		
		while (cursor.hasNextToken())
		{
			token = cursor.toNextToken();
			if (token.isAttr() &&
"transcoder".equals(cursor.getName().toString()))
			{
				table = cursor.getTextValue();
				break;
			}
		}

		if (table != null)
		{
			cursor.pop();
			value = transcode(table, encoder, value);
			cursor.setTextValue(value);
		}
		cursor.dispose();
	}
	return bodyEvent;
}

My doubts:

1) I noticed that the time for executing execQuery is not
neglectable
(msec: 3688 for a document of only 471 bytes).
   What is wrong in my code ?
2) after disposing the cursor the document is not updated,
how could I
write back my changes to the document ?

Regards
Patrizio

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Hi Patrizio,

execQuery() methods return new documents (there are queries
that
construct new documents), so the modifications on results
will not
affect the original.
In your case, you should be better off using
XMLCursor.selectPath().
This method will set a selection on the original document,
than use
hasNext/toNextSelection methods to navigate.

Avoid creation of many cursors, if you want to improve
performance, in
your case one is probably enough, moving a cursor anywhere
in a document
is much faster than managing many cursors. After you're done
with it
don't forget to call dispose().

Cezar

> -----Original Message-----
> From: Patrizio.Ferlitob-source.ch
[mailto:Patrizio.Ferlitob-source.ch]
> Sent: Friday, April 06, 2007 10:41 AM
> To: userxmlbeans.apache.org
> Subject: XMLBeans and XmlCursor
> 
> 
> Hi all,
> 
> I've just started to use XMLBeans and I had some
troubles to use
> XmlCursor to navigate through a document, update it and
get back the
> updated version.
> 
> This is my xml document:
> 
> <?xml version="1.0"
encoding="UTF-8"?>
> <eda:quoteEvent xmlns:eda="http://www.bsourc
e.ch/EDA">
> 	<eda:security>CS GROUP N</eda:security>
> 	<eda:date>09-03-2007</eda:date>
> 	<eda:time/>
>
	<eda:national-nr>1213853</eda:national-nr>
> 	<eda:change>-0.2</eda:change>
> 	<eda:volume>5821192</eda:volume>
> 	<eda:currency
transcoder="CURRENCY">CHF</eda:currency>
> 	<eda:prev-close>87.9</eda:prev-close>
> 	<eda:open>87.75</eda:open>
> 	<eda:last>87.7</eda:last>
> </eda:quoteEvent>
> 
> I would like to retrieve all nodes with transcoder
attribute (I've
used
> the //transcoder/.. expression), call another component
(for
> transcodification) and get back the below new one:
> 
> <?xml version="1.0"
encoding="UTF-8"?>
> <eda:quoteEvent xmlns:eda="http://www.bsourc
e.ch/EDA">
> 	<eda:security>CS GROUP N</eda:security>
> 	<eda:date>09-03-2007</eda:date>
> 	<eda:time/>
>
	<eda:national-nr>1213853</eda:national-nr>
> 	<eda:change>-0.2</eda:change>
> 	<eda:volume>5821192</eda:volume>
> 	<eda:currency
transcoder="CURRENCY">001</eda:currency>
> 	<eda:prev-close>87.9</eda:prev-close>
> 	<eda:open>87.75</eda:open>
> 	<eda:last>87.7</eda:last>
> </eda:quoteEvent>
> 
> The code is:
> 
>   XmlObject xobj = XmlObject.Factory.parse(new
> ByteArrayInputStream(bodyEvent.getBytes()));
>   XmlObject response = EDATool.transcodification (xobj,
"SMI-EDA");
> 
> where
> 
> public static XmlObject transcodification (XmlObject
bodyEvent, String
> encoder) throws Exception
> {
> 	if ((bodyEvent == null) || (encoder == null))
> 		throw new Exception("unexpected null
object");
> 
> 	long start = System.currentTimeMillis();
> 	XmlObject[] elems = bodyEvent.execQuery("//transcoder/..");
> 	System.out.println ("execQuery elapsed time msec:
" +
> (System.currentTimeMillis() - start));
> 
> 	for (int i = 0; i < elems.length; i++)
> 	{
> 		XmlCursor cursor = elems[i].newCursor();
> 		TokenType token = null;
> 
> 		String value = cursor.getTextValue();
> 		String table = null;
> 
> 		while (cursor.hasNextToken())
> 		{
> 			token = cursor.toNextToken();
> 			if (token.isAttr() &&
>
"transcoder".equals(cursor.getName().toString()))
> 			{
> 				table = cursor.getTextValue();
> 				break;
> 			}
> 		}
> 
> 		if (table != null)
> 		{
> 			cursor.pop();
> 			value = transcode(table, encoder, value);
> 			cursor.setTextValue(value);
> 		}
> 		cursor.dispose();
> 	}
> 	return bodyEvent;
> }
> 
> My doubts:
> 
> 1) I noticed that the time for executing execQuery is
not neglectable
> (msec: 3688 for a document of only 471 bytes).
>    What is wrong in my code ?
> 2) after disposing the cursor the document is not
updated, how could I
> write back my changes to the document ?
> 
> Regards
> Patrizio
> 


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