/**
 * <copyright> Copyright (c) 2006 by Know-Center, Graz, Austria </copyright>
 * 
 * This software is the confidential and proprietary information of Know-Center,
 * Graz, Austria. You shall not disclose such Confidential Information and shall
 * use it only in accordance with the terms of the license agreement you entered
 * into with Know-Center.
 * 
 * KNOW-CENTER MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
 * THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
 * NON-INFRINGEMENT. KNOW-CENTER SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY
 * LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
 * DERIVATIVES.
 * 
 * $Id: Verificator.java,v 1.1 2006/08/25 17:07:21 wprinz Exp $
 */
package at.knowcenter.wag.egov.egiz.framework;

import java.util.List;

import at.knowcenter.wag.egov.egiz.exceptions.PresentableException;
import at.knowcenter.wag.exactparser.parsing.results.FooterParseResult;


/**
 * Given an Incremental Update Block and the corresponding PDF, a verificator
 * extracts all Signatures of its type and returns them as valitatable
 * SignatureHolders.
 * 
 * @author wprinz
 */
public interface Verificator
{
  /**
   * Parses the given document/Block for signatures of this type.
   * 
   * @param pdf
   *          The whole pdf document. A Verificator must only access the
   *          document up to its given block (block.next_index) and must not
   *          modify any byte in the pdf array.
   * @param block
   *          The incremental update block.
   * @param start_of_whole_block
   *          The start of the incremental update block (the end of the previous
   *          block) - If 0, this is the first block (the original Document).
   * @return Returns the List of SignatureHolder objects found for this block.
   */
  public List parseBlock(final byte[] pdf, final FooterParseResult block,
      int start_of_whole_block) throws PresentableException;

}