/* $Id: pdfmerge_with_adjusted_pdfversion.java,v 1.1 2008/04/08 12:33:42 katja Exp $
 * PDF merge with adjusted PDF version:
 * Merge multiple PDF documents with the output PDF having as version number
 * the maximum of the PDF version numbers of all imported documents.
 * 
 * Only the pages from the imported documents are merged; interactive elements
 * will be ignored.
 *
 * Required software: PDFlib+PDI/PPS 7
 * Required data: PDF documents
 */
package com.pdflib.cookbook.pdflib.pdf_import;

import com.pdflib.pdflib;
import com.pdflib.PDFlibException;

public class pdfmerge_with_adjusted_pdfversion
{
    public static void main (String argv[])
    {
    /* This is where the data files are. Adjust as necessary. */
    String searchpath = "../input";
    String outfile = "pdfmerge_with_adjusted_pdfversion.pdf";
    String title = "PDF Merge with adjusted PDF Version";

    pdflib p = null;
    String pdffiles[] =
    {
        "PDFlib-real-world.pdf",
        "PDFlib-datasheet.pdf",
        "TET-datasheet.pdf",
        "PLOP-datasheet.pdf",
        "pCOS-datasheet.pdf"
    };
    int i, indoc;
    double pdfver = 0, maxpdfver = 0;

    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");

        /* -----------------------------------------------------------------
         * Loop over all input documents to retrieve the highest PDF version
         * used
         * -----------------------------------------------------------------
         */
        for (i=0; i < pdffiles.length; i++) {
            /* Open the input PDF */
            indoc = p.open_pdi_document(pdffiles[i], "");
            if (indoc == -1) {
                System.err.println("Error: " + p.get_errmsg());
                continue;
            }
        
            /* Retrieve the PDF version of the current document. If it is higher 
             * than the maximum version retrieved until now make it to be the
             * maximum version.
             */  
            pdfver = p.pcos_get_number(indoc, "pdfversion")/10;
            if (pdfver > maxpdfver) {
                maxpdfver = pdfver;
            }
            
            /* Close the input document.
             * Depending on the number of PDFs and memory strategy, PDI handles
             * to all documents could also be kept open between the first and
             * second run (requires more memory, but runs faster). We close all
             * PDFs after checking the version number, and reopen them in the
             * second loop (requires less memory, but is slower).
             */
            p.close_pdi_document(indoc);
        }

        /* ---------------------------------------------------------------
         * Open the output document with the maximum PDF version retrieved
         * --------------------------------------------------------------- 
         */ 
        String optlist = "compatibility=" + Double.toString(maxpdfver);
             
        if (p.begin_document(outfile, optlist) == -1)
            throw new Exception("Error: " + p.get_errmsg());

        p.set_info("Creator", "PDFlib Cookbook");
        p.set_info("Title", title + " $Revision: 1.1 $");
        
        /* --------------------------------------------------------------------
         * Loop over all input documents to merge them into the output document       * used
         * --------------------------------------------------------------------
         */
        for (i=0; i < pdffiles.length; i++) {
            int endpage, pageno, page;

            /* Open the input PDF */
            indoc = p.open_pdi_document(pdffiles[i], "");
            if (indoc == -1) {
                System.err.println("Error: " + p.get_errmsg());
                continue;
            }
        
            endpage = (int) p.pcos_get_number(indoc, "/Root/Pages/Count");

            /* Loop over all pages of the input document */
            for (pageno = 1; pageno <= endpage; pageno++) {
                page = p.open_pdi_page(indoc, pageno, "");

                if (page == -1) {
                    System.err.println("Error: " + p.get_errmsg());
                    continue;
                }
                /* Dummy page size; will be adjusted later */
                p.begin_page_ext(10, 10, "");

                /* Create a bookmark with the file name */
                if (pageno == 1)
                    p.create_bookmark(pdffiles[i], "");

                /* Place the imported page on the output page, and
                 * adjust the page size
                 */
                p.fit_pdi_page(page, 0, 0, "adjustpage");
                p.close_pdi_page(page);

                p.end_page_ext("");
            }
            /* Close the input document */
            p.close_pdi_document(indoc);
        }

        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();
            }
        }
    }
}