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Subject: XOM API for Processing XML with Java

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  • From: Christophe Marchand <christophe.marchand AT axyus.com>
  • To: XOM API for Processing XML with Java <xom-interest AT lists.ibiblio.org>
  • Subject: Re: [XOM-interest] Processing XML file of 4GB
  • Date: Wed, 02 May 2012 16:11:11 +0200

Sometime, writing your own SAX handler to code your controls is quicker than everything else ; and if your code is clean, it will work on very very very huge files.

Regards,
Christophe

Le 02/05/2012 15:21, Geet Gangwar a écrit :
Hi Michael,

As suggested by you I have used /xbrli:xbrl/xbrli:context to get all
context from the file. But apart from context there are other child nodes
of /xbrli:xbrl nodes which are around 50 millions in number and I want a
list of all those elements based on attribute. I am using Xpath as
/xbrli:xbrl/[@contextRef] but getting heap space errors. The problem is
there is not specific node name available for nodes all names are different.


Regards

Geet

On Mon, Apr 30, 2012 at 7:12 PM, Michael Kay<mike AT saxonica.com> wrote:

In that case I would suggest starting with an initial path of
/xbrli:xbrl/xbrli:context rather than /xbrli:xbrl.

Michael Kay
Saxonica

On 30/04/2012 14:16, Geet Gangwar wrote:
There multiple occurrences of contexts element say upto 10 million.

Validation logic for each object is same. I need to pick one context
perform the validation logic, pick another perform the same logic.

Regards

Geet

On Mon, Apr 30, 2012 at 6:33 PM, Michael Kay<mike AT saxonica.com> wrote:

Follow-up questions then:

(1) how big is an xbrli:context object?

(2) is the validation of each xbrli:context object independent of the
others?

(3) what is the logic of the validation that needs to be performed?

Michael Kay
Saxonica

On 30/04/2012 13:37, Geet Gangwar wrote:
Hi Michael,

Basically I need to perform some validation on the xml files. So my
requirement is to pick particular block from xml and validate that
block.
For example say I want to pull all context i.e

XPATH expression like : /xbrli:xbrl/xbrli:context

from the document and validate them.

Regards

Geet

On Mon, Apr 30, 2012 at 5:41 PM, Michael Kay<mike AT saxonica.com>
wrote:
NUX implements what one might call "chunked streaming": it selects a
sequence of subtrees of your document and applies XQuery processing to
each one in turn. (This is effectively the same as saxon:stream() in
Saxon.) You need to have enough memory to hold the largest of these
subtrees. Because your path /xbrli:xbrl effectively selects the whole
document, your largest subtree is the same as the document size, so
you
aren't really streaming at all.

If you can describe the query/transformation you want to carry out,
then
I might be able to suggest a way of doing it in a streamed manner
either
using NUX, or using native facilities of Saxon (whose streaming
capabilities have advanced considerably since NUX was last released).

Michael Kay
Saxonica


2012/4/30 Geet Gangwar<geetgangwar AT gmail.com>
Hi,

I have a requirement of processing large XML files of about 4GB. I
am
using
the NUX distribution to process the files.
But when I fire a Xquery to this read this file, I get JAVA Heap
Space
error.

I am using 64bit JDK1.6 and also I have increased the JVM size to 5
GB
by
-Xmx5G.

Please help me how to solve this problem.

I am pasting my sample code also.

String path = "/xbrli:xbrl/";
Map prefixes = new HashMap();
prefixes.put("xbrli", "
http://www.xbrl.org/2003/instance
");
prefixes.put("link", "
http://www.xbrl.org/2003/linkbase
");
prefixes.put("xlink", "http://www.w3.org/1999/xlink
");
prefixes.put("xsd", "
http://www.w3.org/2001/XMLSchema
");
StreamingTransform myTransform = new
StreamingTransform() {
private Nodes NONE = new Nodes();

// execute XQuery against each element matching
location
path
public Nodes transform(Element subtree) {
Nodes results = XQueryUtil.xquery(subtree,
"xbrli:context[id = 'c-01']");

for (int i=0; i< results.size(); i++) {
// do something useful with query
results;
here we
just print them

System.out.println(XOMUtil.toPrettyXML(results.get(i)));
}
return NONE; // current subtree becomes
subject
to
garbage collection
// returning empty node list removes current
subtree
from document being build.
// returning new Nodes(subtree) retains the
current
subtree.
// returning new Nodes(some other nodes)
replaces
the
current subtree with
// some other nodes.
// if you want (SAX) parsing to terminate at
this
point, simply throw an exception
}
};

// parse document with a filtering Builder
StreamingPathFilter filter = new
StreamingPathFilter(path,
prefixes);
Builder builder = new
Builder(filter.createNodeFactory(null,
myTransform));
Document doc = builder.build(new
File("F:/sample/cntxt.xml"));
System.out.println(doc.getRootElement().getValue());
System.out.println("doc.size()=" +
doc.getRootElement().getChildCount());
System.out.println(XOMUtil.toPrettyXML(doc));

Regards

Geet
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