//---------------------------------------------------------------------------------------
// Copyright (c) 2001-2008 by PDFTron Systems Inc. All Rights Reserved.
// Consult legal.txt regarding legal and license information.
//---------------------------------------------------------------------------------------

import pdftron.PDF.*;
import pdftron.SDF.SDFDoc;

//---------------------------------------------------------------------------------------
// The sample code shows how to edit the page display list and how to modify graphics state 
// attributes on existing Elements. In particular the sample program strips all images from 
// the page and changes text color to blue. 
//---------------------------------------------------------------------------------------
public class ElementEditTest 
{
	public static void main(String[] args) {
	
		PDFNet.initialize();
		PDFNet.setResourcesPath("../../../resources");

		// Relative path to the folder containing test files.
		String input_path =  "../../TestFiles/";
		String output_path = "../../TestFiles/Output/";

		try  
		{	 
			PDFDoc doc=new PDFDoc((input_path + "newsletter.pdf"));
			doc.initSecurityHandler();

			int num_pages = doc.getPageCount();

			ElementWriter writer=new ElementWriter();
			ElementReader reader=new ElementReader();
			Element element;

			for(int i=1; i<=num_pages; ++i)
			{
				PageIterator itr = doc.getPageIterator(i);
				Page page=(Page)(itr.next());
				reader.begin(page);

				Page new_page = doc.pageCreate();
				PageIterator next_page = itr;
				doc.pageInsert(next_page, new_page );

				writer.begin(new_page);
				while ((element = reader.next())!=null) 	// Read page contents
				{
					if (element.getType() == Element.e_text) 
					{
						// Set all text to blue color.
						GState gs = element.getGState();
						gs.setFillColorSpace(ColorSpace.createDeviceRGB());
						gs.setFillColor(new ColorPt(0, 0, 1));
					}
					else if (element.getType() == Element.e_image) 
					{
						// remove all images
						continue;
					}

					writer.writeElement(element);
				}

				writer.end();
				reader.end();
				new_page.setMediaBox(page.getCropBox());
				doc.pageRemove(doc.getPageIterator(i));
			}

			doc.save((output_path + "newsletter_edited.pdf"), SDFDoc.e_remove_unused , null);
		    // doc.Save((output_path + "newsletter_edited.pdf").c_str(), Doc::e_linearized , 0);
			System.out.println("Done. Result saved in newsletter_edited.pdf...");
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}

		PDFNet.terminate();
	}
}