PrimitiveSample.java :  » PDF » PDFClown-0.0.5 » it » stefanochizzolini » clown » samples » Java Open Source

package it.stefanochizzolini.clown.samples;

import it.stefanochizzolini.clown.documents.Document;
import it.stefanochizzolini.clown.files.File;
import it.stefanochizzolini.clown.objects.PdfArray;
import it.stefanochizzolini.clown.objects.PdfDictionary;
import it.stefanochizzolini.clown.objects.PdfInteger;
import it.stefanochizzolini.clown.objects.PdfName;
import it.stefanochizzolini.clown.tokens.FileFormatException;

/**
  This sample demonstrates how to perform advanced editing over a PDF document
  structure accessing primitive objects. Particularly, it adds an 'open action' to
  the document so that it starts with the content of page 2 magnified just enough to
  fit the height of the page within the window.
*/
public class PrimitiveSample
  implements ISample
{
  public void run(
    PDFClownSampleLoader loader
    )
  {
    // (boilerplate user choice -- ignore it)
    String filePath = loader.getPdfFileChoice("Please select a PDF file");

    // 1. Open the PDF file!
    File file;
    try{file = new File(filePath);}
    catch(FileFormatException e){throw new RuntimeException(filePath + " file has a bad file format.",e);}
    catch(Exception e){throw new RuntimeException(filePath + " file access error.",e);}

    // Get the PDF document!
    Document document = file.getDocument();

    // 2. Modifying the document...
    {
      // Create the action dictionary!
      PdfDictionary action = new PdfDictionary();
      // Define the action type (in this case: go-to)!
      action.put(new PdfName("S"),new PdfName("GoTo"));
      // Defining the action destination...
      {
        // Create the destination array!
        PdfArray destination = new PdfArray();
        // Define the 2nd page as the destination target!
        destination.add(document.getPages().get(1).getBaseObject());
        // Define the location of the document window on the page (fit vertically)!
        destination.add(new PdfName("FitV"));
        // Define the window's left-edge horizontal coordinate!
        destination.add(new PdfInteger(-32768));
        // Associate the destination to the action!
        action.put(new PdfName("D"),destination);
      }
      // Associate the action to the document!
      document.getBaseDataObject().put(
        new PdfName("OpenAction"),
        file.register(action) // Adds the action to the file, returning its reference.
        ); document.update(); // Update the existing document object (fundamental to override previous content).
    }

     // (boilerplate metadata insertion -- ignore it)
    loader.buildAccessories(document,this.getClass(),"Primitive objects","manipulating a document at primitive object level");

   // 3. Serialize the PDF file (again, boilerplate code -- see the PDFClownSampleLoader class source code)!
    loader.serialize(file,this.getClass().getSimpleName());
  }
}