[xep-support] Question: get the number of page of the PDF file rendered byXEP

[Nikolai Grigoriev]

Daniel,

> We are currently using the version 2.7 of XEP in a Java application
> to render XML files to PDF files at WIPO.
>
> Is there any possibility to get the number of pages of the result files,
> rather than writing our own event Logger to count the pages ?

No, we don't have any method of getting the number of pages in a single
Java call. You can count them programmatically in two ways:
- either catch respective Logger events,
- or, intercept pages as they are passed from the formatter to PDF/PS generator.

Both logger and generator implement standard SAX interfaces, so
the procedure is similar in all cases. Here's a class that inserts
itself between the formatter and the generator, and counts pages:

public class MyPDFProducer extends com.renderx.FO2PDF.T.H4PDFJ {
     private int pageCount = 0;
     public int getPageCount() { return pageCount; };

     public void startElement(String name,
                              org.xml.sax.AttributeList attrs)
            throws org.xml.sax.SAXException {
       if ("page".equals(name)) pageCount++;
       super.startElement(name, attrs);
    }
}

In your rendering call, substitute MyPDFProducer to H4PDFJ.
After rendering, the number of pages actually passed to the formatter
will be stored inside the producer instance; retrieve it with
getPageCount() method.

Hope this helps.

Best regards,
Nikolai Grigoriev
RenderX


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