package at.gv.egiz.pdfas.utils;

/**
 * PDF/A utility class
 * @author dferbas
 *
 */
public class PdfAUtil {
   
   /**
    * Extract pdfa version from pdf metadata
    * @param pdfMetadata
    * @return
    */
   public static String findPdfAVersion(String pdfMetadata) {

      String inf = pdfMetadata;
      String pdfaNsMark = "http://www.aiim.org/pdfa/ns/id/";
      String partMark = "<pdfaid:part>";
      String confMark = "<pdfaid:conformance>";
      int pdfaI = inf.indexOf(pdfaNsMark);

      if (pdfaI > -1) {
         int part = inf.indexOf(partMark);
         StringBuffer version = new StringBuffer("PDF/A-");
         part = part + partMark.length();
         version.append(inf.substring(part, part + 1));
         int conf = inf.indexOf(confMark);

         conf = conf + confMark.length();
         version.append(inf.substring(conf, conf + 1));

         return version.toString();
      } else {
         return null;

      }
   }

}