XOM API for Processing XML with Java

[Geet Gangwar <geetgangwar AT gmail.com>]

Thanks Bruno for your quick reply. I read on the NUX site that it is an
extension of XOM. Also I have used the StreamingTransform class of XOM.

I have multiple xml files to process which are interlinked with each other
through xlink. So having Xpath is necessary for me. I am not getting how to
approach by just using Stax apis.

Regards

Geet

On Mon, Apr 30, 2012 at 5:20 PM, Bruno Oliveira <bruno.oliveira360 AT gmail.com
> wrote:

> Hi,
> 5 GB of memory isn't enought. In average, a XML file needs 4 or 5 times
> more memory compared to the file size. For example, you have a file with
> 4GB, probably you will need to 12-15 GB of memory at least (depends of the
> number of nested nodes per node). If you want to process the entire file, i
> recomend you to use a Streaming-based API, e.g., StAX, or use the XOM
> stream-based approach: http://www.xom.nu/faq.xhtml
>
> Best Regards,
> Bruno Oliveira
>
> 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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> >
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