/**
 * <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.
 *
 * $Id: TextualVerificator_pdfasold.java,v 1.3 2006/10/11 08:03:22 wprinz Exp $
 */
package at.knowcenter.wag.egov.egiz.framework.verificators;

import java.io.ByteArrayInputStream;
import java.util.List;

import org.apache.log4j.Logger;

import at.knowcenter.wag.egov.egiz.PdfAS;
import at.knowcenter.wag.egov.egiz.cfg.ConfigLogger;
import at.knowcenter.wag.egov.egiz.exceptions.PDFDocumentException;
import at.knowcenter.wag.egov.egiz.exceptions.PresentableException;
import at.knowcenter.wag.egov.egiz.framework.Verificator;
import at.knowcenter.wag.exactparser.parsing.results.FooterParseResult;


/**
 * This Verificator extracts a PDF-AS old signature from the original document.
 * 
 * @author wprinz
 */
public class TextualVerificator_pdfasold implements Verificator
{
  /**
   * The logger definition.
   */
  private static final Logger logger_ = ConfigLogger.getLogger(TextualVerificator_1_0_0.class);

  /**
   * Default Constructor. 
   */
  public TextualVerificator_pdfasold()
  {
    // Default Constructor.
  }

  /**
   * @see at.knowcenter.wag.egov.egiz.framework.Verificator#parseBlock(byte[], at.knowcenter.wag.exactparser.parsing.results.FooterParseResult, int)
   */
  public List parseBlock(byte[] pdf, FooterParseResult block,
      int start_of_whole_block) throws PresentableException
  {
    if (start_of_whole_block != 0)
    {
      throw new PDFDocumentException(201, "The PDF-AS-old Verificator can only be applied on original documents.");
    }
    
    String normalized_text = PdfAS.extractNormalizedTextTextual(pdf, block.next_index);

    logger_.debug("Scanning block:");
    List signature_holders = PdfAS.extractSignatureHoldersTextual(normalized_text, true);
    logger_.debug(": end of Scanning block");

    
//    List signature_holders = new ArrayList();
//
//    SignatureTypes sig_types = SignatureTypes.getInstance();
//    List signatureTypes_ = sig_types.getSignatureTypeDefinitions();
//
//    boolean can_separate = true;
//    int endIndex = normalized_text.length();
//    String signed_text = normalized_text;
//
//    SignatureBlock sig_block = new SignatureBlock(signatureTypes_);
//    can_separate = sig_block.separateBlockFromRawText(signed_text, true);
//    if (can_separate)
//    {
//      endIndex = sig_block.getStartIndex();
//      signed_text = signed_text.substring(0, endIndex);
//
//      SignatureObject sig_object = sig_block.getSignatureObject();
//
//      SignatureHolder holder = new SignatureHolder();
//      holder.signed_text = signed_text;
//      holder.signature_object = sig_object;
//      signature_holders.add(0, holder);
//    }
        
    return signature_holders;
  }

}