< Android samples

SDFTest - Java

The sample illustrates how to use basic Cos/SDF API to edit an existing document.

// Copyright (c) 2001-2018 by PDFTron Systems Inc. All Rights Reserved.
// Consult legal.txt regarding legal and license information.

import com.pdftron.pdf.*;
import com.pdftron.sdf.*;
import com.pdftron.filters.*;

// This sample illustrates how to use basic SDF API (also known as Cos) to edit an 
// existing document.
public class SDFTest 
	public static void main(String[] args)

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

			System.out.println("Opening the test file...");

			// Here we create a SDF/Cos document directly from PDF file. In case you have 
			// PDFDoc you can always access SDF/Cos document using PDFDoc.GetSDFDoc() method.
			SDFDoc doc=new SDFDoc((input_path + "fish.pdf"));

			System.out.println("Modifying info dictionary, adding custom properties, embedding a stream...");
			Obj trailer = doc.getTrailer();			// Get the trailer

			// Now we will change PDF document information properties using SDF API

			// Get the Info dictionary. 
			DictIterator itr = trailer.find("Info");	
			Obj info;
			if (itr.hasNext()) 
				info = itr.value();
				// Modify 'Producer' entry.
				info.putString("Producer", "PDFTron PDFNet");

				// Read title entry (if it is present)
				itr = info.find("Author"); 
				if (itr.hasNext()) 
					String oldstr=itr.value().getAsPDFText();

					info.putText("Author",oldstr+"- Modified");
					info.putString("Author", "Me, myself, and I");
				// Info dict is missing. 
				info = trailer.putDict("Info");
				info.putString("Producer", "PDFTron PDFNet");
				info.putString("Title", "My document");

			// Create a custom inline dictionary within Info dictionary
			Obj custom_dict = info.putDict("My Direct Dict");
			custom_dict.putNumber("My Number", 100);	 // Add some key/value pairs
			custom_dict.putArray("My Array");

			// Create a custom indirect array within Info dictionary
			Obj custom_array = doc.createIndirectArray();	
			info.put("My Indirect Array", custom_array);	// Add some entries
			// Create indirect link to root

			// Embed a custom stream (file mystream.txt).
			MappedFile embed_file=new MappedFile(input_path + "my_stream.txt");
			FilterReader mystm=new FilterReader(embed_file);
			custom_array.pushBack( doc.createIndirectStream(mystm) );

			// Save the changes.
			System.out.println("Saving modified test file...");
			doc.save((output_path + "sdftest_out.pdf"), null, null, "%PDF-1.4");

			System.out.println("Test completed.");
		catch(Exception e)