How to get the number of pages when assemble pdf with DDX

Hi,
     I have tried to add two bookmarks to one pdf with DDX(in java code),
     the first bookmark I shall add to the first page,and the second I shall add to the second page....
    the question is:
     If the pdf has only one page, I will not add bookmarks to the pdf. so I need to get the pages of pdf before my processing.
    but I did not found any APIs in the SDK about it .
     Can anyone help me.
     thanks.

I have solve the problem myself
I use the tag "DocumentInformation" in DDX and get the xml after invoking DDX,
the xml contain the information of document
the sample DDX as:
     <?xml version="1.0" encoding="UTF-8"?>
   <DDX xmlns="http://ns.adobe.com/DDX/1.0/">
           <DocumentInformation source="mergedPDF" result="doc_info.xml" />
   </DDX>

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