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PKCS#11 wrapper based on sunpkcs11
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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 java.util.Arrays;

import iaik.pkcs.pkcs11.Util;

/**
 * Objects of this class represent a char-array attribute of a PKCS#11 object
 * as specified by PKCS#11.
 *
 * @author Karl Scheibelhofer
 * @version 1.0
 * @invariants
 */
public class CharArrayAttribute extends Attribute {

  /**
   * Constructor taking the PKCS#11 type of the attribute.
   *
   * @param type
   *          The PKCS#11 type of this attribute; e.g.
   *          PKCS11Constants.CKA_LABEL.
   * @preconditions (type <> null)
   * @postconditions
   */
  public CharArrayAttribute(Long type) {
    super(type);
  }

  /**
   * Set the char-array value of this attribute. Null, is also valid.
   * A call to this method sets the present flag to true.
   *
   * @param value
   *          The char-array value to set. May be null.
   * @preconditions
   * @postconditions
   */
  @SuppressWarnings("restriction")
  public void setCharArrayValue(char[] value) {
    ckAttribute.pValue = value;
    present = true;
  }

  /**
   * Get the char-array value of this attribute. Null, is also possible.
   *
   * @return The char-array value of this attribute or null.
   * @preconditions
   * @postconditions
   */
  @SuppressWarnings("restriction")
  public char[] getCharArrayValue() {
    return (char[]) ckAttribute.pValue;
  }

  /**
   * Get a string representation of the value of this attribute.
   *
   * @return A string representation of the value of this attribute.
   * @preconditions
   * @postconditions (result <> null)
   */
  @SuppressWarnings("restriction")
  @Override
  protected String getValueString() {
    String valueString;

    if ((ckAttribute != null) && (ckAttribute.pValue != null)) {
      valueString = new String((char[]) ckAttribute.pValue);
    } else {
      valueString = "";
    }

    return valueString;
  }

  /**
   * Compares all member variables of this object with the other object.
   * Returns only true, if all are equal in both objects.
   *
   * @param otherObject
   *          The other object to compare to.
   * @return True, if other is an instance of this class and all member
   *         variables of both objects are equal. False, otherwise.
   * @preconditions
   * @postconditions
   */
  @SuppressWarnings("restriction")
  @Override
  public boolean equals(Object otherObject) {
    if (this == otherObject) {
      return true;
    }

    if (!(otherObject instanceof CharArrayAttribute)) {
      return false;
    }

    CharArrayAttribute other = (CharArrayAttribute) otherObject;
    if (!this.present && !other.present) {
      return true;
    }

    if (!(this.present && other.present)) {
      return false;
    }

    if (this.sensitive != other.sensitive) {
      return false;
    }

    if (this.ckAttribute.type != other.ckAttribute.type) {
      return false;
    }

    return Arrays.equals((char[]) this.ckAttribute.pValue,
        (char[]) other.ckAttribute.pValue);
  }

  /**
   * The overriding of this method should ensure that the objects of this
   * class work correctly in a hashtable.
   *
   * @return The hash code of this object.
   * @preconditions
   * @postconditions
   */
  @SuppressWarnings("restriction")
  @Override
  public int hashCode() {
    return (ckAttribute.pValue != null) ?
        Util.hashCode((char[]) ckAttribute.pValue) : 0;
  }

  @Override
  public void setValue(Object value) {
    setCharArrayValue((char[]) value);
  }

}