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   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle in the LICENSE file that accompanied this code.
   *
   * This code is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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   */
  
  package java.security;
  
  import java.security.spec.AlgorithmParameterSpec;
  
  /**
   * This class defines the <i>Service Provider Interface</i> (<b>SPI</b>)
   * for the {@code AlgorithmParameterGenerator} class, which
   * is used to generate a set of parameters to be used with a certain algorithm.
   *
   * <p> All the abstract methods in this class must be implemented by each
   * cryptographic service provider who wishes to supply the implementation
   * of a parameter generator for a particular algorithm.
   *
   * <p> In case the client does not explicitly initialize the
   * AlgorithmParameterGenerator (via a call to an {@code engineInit}
   * method), each provider must supply (and document) a default initialization.
   * For example, the Sun provider uses a default modulus prime size of 1024
   * bits for the generation of DSA parameters.
   *
   * @author Jan Luehe
   *
   *
   * @see AlgorithmParameterGenerator
   * @see AlgorithmParameters
   * @see AlgorithmParameterSpec
   *
   * @since 1.2
   */
  
  public abstract class AlgorithmParameterGeneratorSpi {
  
      /**
       * Initializes this parameter generator for a certain size
       * and source of randomness.
       *
       * @param size the size (number of bits).
       * @param random the source of randomness.
       */
      protected abstract void engineInit(int size, SecureRandom random);
  
      /**
       * Initializes this parameter generator with a set of
       * algorithm-specific parameter generation values.
       *
       * @param genParamSpec the set of algorithm-specific parameter generation values.
       * @param random the source of randomness.
       *
       * @exception InvalidAlgorithmParameterException if the given parameter
       * generation values are inappropriate for this parameter generator.
       */
      protected abstract void engineInit(AlgorithmParameterSpec genParamSpec,
                                         SecureRandom random)
          throws InvalidAlgorithmParameterException;
  
      /**
       * Generates the parameters.
       *
       * @return the new AlgorithmParameters object.
       */
      protected abstract AlgorithmParameters engineGenerateParameters();
  }
  