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pdf_import/import_pages_into_layers

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/* $Id: import_pages_into_layers.java,v 1.4 2013/01/15 10:12:02 stm Exp $
 * Import pages into layers:
 * Import two pages and output them on two layers on the same page
 *
 * Import an English and a German PDF page and place them on an English and a
 * German layer on the same page.
 *
 * Required software: PDFlib+PDI/PPS 9
 * Required data: PDF document
 */
package com.pdflib.cookbook.pdflib.pdf_import;

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

public class import_pages_into_layers
{
    public static void main (String argv[])
    {
    /* This is where the data files are. Adjust as necessary. */
    String searchpath = "../input";
    String outfile = "import_pages_into_layers.pdf";
    String title = "Import Pages into Layers";

    pdflib p = null;
    String fileEN = "PDFlib-real-world.pdf";
    String fileDE = "PDFlib-real-world-D.pdf";
    int indocEN, indocDE, pageEN, pageDE;
    int layerEN, layerDE;

    try {
        p = new pdflib();

        p.set_option("searchpath={" + searchpath + "}");

        /* This means we must check return values of load_font() etc. */
        p.set_option("errorpolicy=return");

        if (p.begin_document(outfile, "openmode=layers") == -1)
            throw new Exception("Error: " + p.get_errmsg());

        p.set_info("Creator", "PDFlib Cookbook");
        p.set_info("Title", title + " $Revision: 1.4 $");

        /* Open the first page of the English input PDF */
        indocEN = p.open_pdi_document(fileEN, "");
        if (indocEN == -1)
            throw new Exception("Error: " + p.get_errmsg());

        pageEN = p.open_pdi_page(indocEN, 1, "");
        if (pageEN == -1)
            throw new Exception("Error: " + p.get_errmsg());
        
        /* Open the first page of the German input PDF */
        indocDE = p.open_pdi_document(fileDE, "");
        if (indocDE == -1)
            throw new Exception("Error: " + p.get_errmsg());

        pageDE = p.open_pdi_page(indocDE, 1, "");
        if (pageDE == -1)
            throw new Exception("Error: " + p.get_errmsg());

        /* Start the page */
        p.begin_page_ext(0, 0, "width=a4.width height=a4.height");
        
        /* Define the layer "English" and place some English text on it */
        layerEN = p.define_layer("English", "");
        p.begin_layer(layerEN);

        /* Place the imported page on the English layer of the output page */
        p.fit_pdi_page(pageEN, 0, 0, "");

        p.close_pdi_page(pageEN);
        
        /* Define the layer "German" which is hidden when opening the document
         * or printing it
         */
        layerDE = p.define_layer("German", "initialviewstate=false " +
            "initialprintstate=false");
        p.begin_layer(layerDE);
        
        /* Place the imported page on the German layer of the output page */
        p.fit_pdi_page(pageDE, 0, 0, "");

        p.close_pdi_page(pageDE);
        
        /* At most one of the "English" and "German" layers should be visible */
        p.set_layer_dependency("Radiobtn", "group={" + layerEN + " " +
            layerDE + "}");
        
        /* Complete all layers */
        p.end_layer();

        p.end_page_ext("");
       
        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();
            }
        }
    }
}