PdfWorker.scala

import java.io.File;
import java.io.IOException;
import java.io.FileWriter;
import java.io.FileOutputStream;

import com.pdftron.pdf._;
import com.pdftron.sdf.SDFDoc;
import com.pdftron.sdf.Obj;


class PdfWorker  {
  def run (infile: File): Unit = {
    PDFNet.initialize();
    println(infile.getAbsolutePath)
    var doc = new PDFDoc(infile.getAbsolutePath)

    var iter = doc.fdfExtract().getFieldIterator
    while (iter.hasNext) {
      var field = iter.next
      var obj = field.getSDFObj().findObj("T")
      if (obj != null && obj.isString()) {
          obj.setString("Barfdsay");
          println("%d %s".format(obj.getType, obj.getAsPDFText()));
      }
    }

    iter = doc.fdfExtract().getFieldIterator
    while (iter.hasNext) {
      var field = iter.next
      var obj = field.getSDFObj().findObj("T")
      if (obj != null && obj.isString()) {
          println("%d %s".format(obj.getType, obj.getAsPDFText()));
      }
    }

    println("Changed")
    doc.save(new FileOutputStream("out.pdf"), SDFDoc.SaveMode.INCREMENTAL, null);
    println("saved")
    doc.close
  }
}