/**
 * <copyright> Copyright 2006 by Know-Center, Graz, Austria </copyright>
 * PDF-AS has been contracted by the E-Government Innovation Center EGIZ, a
 * joint initiative of the Federal Chancellery Austria and Graz University of
 * Technology.
 *
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 */
package at.gv.egiz.pdfas.utils;

/**
 * PDF/A utility class
 * @author dferbas
 *
 */
public class PdfAUtil {
   /**
    * dferbas: Text representation of pdfa version string
    */
   private static final String PDFA_PREFIX = "ISO 19005-1:2005 PDF/A-";   
   /**
    * 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(PDFA_PREFIX);
         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).toLowerCase());

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

      }
   }

}