pdf_import/import_in_reverse_order

 * Import in reverse order:

 * Read the pages of an input PDF document and output them in reverse order

 * 

 * Open the pages of the input document in reverse order and place them in

 * the output PDF.

 * 

 * Required software: PDFlib+PDI/PPS 7

 * Required data: PDF document

 */

package com.pdflib.cookbook.pdflib.pdf_import;

import com.pdflib.pdflib;

import com.pdflib.PDFlibException;

public class import_in_reverse_order

{

    public static void main (String argv[])

    {

    /* This is where the data files are. Adjust as necessary. */

    String searchpath = "../input";

    String outfile = "import_in_reverse_order.pdf";

    String title = "Import in Reverse Order";

    pdflib p = null;

    String pdffile = "PDFlib-datasheet.pdf";

    int indoc, pageno, endpage, page;

    try {

        p = new pdflib();

        p.set_parameter("SearchPath", searchpath);

        /* This means we must check return values of load_font() etc. */

        p.set_parameter("errorpolicy", "return");

        if (p.begin_document(outfile, "") == -1)

            throw new Exception("Error: " + p.get_errmsg());

        p.set_info("Creator", "PDFlib Cookbook");

        p.set_info("Title", title + " $Revision: 1.1 $");

        /* Open the input PDF */

        indoc = p.open_pdi_document(pdffile, "");

        if (indoc == -1)

            throw new Exception("Error: " + p.get_errmsg());

        /* Retrieve the overall number of pages for the input document */

        endpage = (int) p.pcos_get_number(indoc, "length:pages");

        /* Loop over all pages of the input document in reverse order */

        for (pageno = endpage; pageno > 0; pageno--)

        {

            page = p.open_pdi_page(indoc, pageno, "");

            if (page == -1)

                throw new Exception("Error: " + p.get_errmsg());

            /* Dummy page size; will be adjusted later */

            p.begin_page_ext(10, 10, "");

            /* Place the imported page without performing

             * any changes on the output page

             */

            p.fit_pdi_page(page, 0, 0, "adjustpage");

            p.end_page_ext("");

            p.close_pdi_page(page);

        }

        p.end_document("");

        } catch (PDFlibException e) {

            System.err.print("PDFlib exception occurred:\n");

            System.err.print("[" + e.get_errnum() + "] " + e.get_apiname() +

                ": " + e.get_errmsg() + "\n");

        } catch (Exception e) {

            System.err.println(e.getMessage());

        } finally {

            if (p != null) {

                p.delete();

            }

        }

    }

}