/**
 * <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: SignatureHolder.java,v 1.3 2006/10/11 07:57:58 wprinz Exp $
 */
package at.knowcenter.wag.egov.egiz.pdf;

import at.gv.egiz.pdfas.framework.input.DataSource;
import at.knowcenter.wag.egov.egiz.sig.SignatureObject;

/**
 * Data structure that holds the information of one signature block, which is
 * the signed/signable text and the corresponding SignatureObject.
 * 
 * <p>
 * Signators and Verifiactors should implement own classes for this interface
 * that generate the text to be signed from the underlying data. For example a
 * binary signature holder could generate the text to be signed by Base64
 * encoding the binary data. Furthermore this allows to cache the text to be
 * signed.
 * </p>
 * 
 * @author wprinz
 */
public interface SignatureHolder
{

//  /**
//   * Returns the signed text (verification) or the to-be-signed signable text
//   * (signation).
//   * 
//   * <p>
//   * Note that this text must be the one that was actually signed. This text is
//   * directly passed to the connector for signation/verification. No
//   * normalization or modification will be / must be done to this text between
//   * reading out from the signature holder and passing the text to the
//   * connector.
//   * </p>
//   * 
//   * @return Returns the signed text or the to-be-signed signable text.
//   */
//  public String getSignedText();

  /**
   * 
   * @return Returns the SignatureObject containing the issuer, serial number,
   *         etc.
   */
  public SignatureObject getSignatureObject();

  /**
   * Returns the DataSource providing the data.
   * @return
   */
  public DataSource getDataSource();
}