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// Copyright (c) 2002 Graz University of Technology. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
//    this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
//
// 3. The end-user documentation included with the redistribution, if any, must
//    include the following acknowledgment:
//
//    "This product includes software developed by IAIK of Graz University of
//     Technology."
//
//    Alternately, this acknowledgment may appear in the software itself, if and
//    wherever such third-party acknowledgments normally appear.
//
// 4. The names "Graz University of Technology" and "IAIK of Graz University of
//    Technology" must not be used to endorse or promote products derived from
//    this software without prior written permission.
//
// 5. Products derived from this software may not be called "IAIK PKCS Wrapper",
//    nor may "IAIK" appear in their name, without prior written permission of
//    Graz University of Technology.
//
// THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED
// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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package iaik.pkcs.pkcs11.objects;

import iaik.pkcs.pkcs11.Mechanism;
import iaik.pkcs.pkcs11.wrapper.Functions;
import iaik.pkcs.pkcs11.wrapper.PKCS11Constants;

/**
 * Objects of this class represent a mechanism attribute of an PKCS#11 object
 * as specified by PKCS#11.
 *
 * @author Karl Scheibelhofer
 * @version 1.0
 */
public class MechanismAttribute extends LongAttribute {

  /**
   * Default constructor - only for internal use in
   * AttributeArrayAttribute.getValueString().
   */
  MechanismAttribute() {
  }

  /**
   * Constructor taking the PKCS#11 type of the attribute.
   *
   * @param type
   *          The PKCS#11 type of this attribute; e.g.
   *          PKCS11Constants.CKA_VALUE_LEN.
   */
  public MechanismAttribute(long type) {
    super(type);
  }

  /**
   * Set the mechanism value of this attribute.
   * null, is also valid.
   * A call to this method sets the present flag to true.
   *
   * @param mechanism
   *          The mechanism value to set. May be null.
   */
  public void setMechanism(Mechanism mechanism) {
    ckAttribute.pValue = (mechanism != null)
        ? mechanism.getMechanismCode() : null;
    present = true;
  }

  /**
   * Get the long value of this attribute. Null, is also possible.
   *
   * @return The long value of this attribute or null.
   */
  public Mechanism getMechanism() {
    return ((ckAttribute != null) && (ckAttribute.pValue != null))
        ? new Mechanism((Long) ckAttribute.pValue)
        : null;
  }

  /**
   * Get a string representation of the value of this attribute.
   *
   * @return A string representation of the value of this attribute.
   */
  @Override
  protected String getValueString() {
    if ((ckAttribute != null) && (ckAttribute.pValue != null)) {
      if (((Long) ckAttribute.pValue)
          != PKCS11Constants.CK_UNAVAILABLE_INFORMATION) {
        return Functions.mechanismCodeToString(((Long) ckAttribute.pValue));
      } else {
        return "";
      }
    } else {
      return "";
    }
  }

}