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/*
** $Id: KeyPairGenerator.java,v 1.2 2006/04/18 11:35:28 cvs Exp $
*/

package java.security;

import java.security.spec.AlgorithmParameterSpec;

public abstract class KeyPairGenerator extends KeyPairGeneratorSpi {

 public static KeyPairGenerator getInstance(String algorithm) throws NoSuchAlgorithmException{
    SecurityAction action = new SecurityAction(algorithm, "KeyPairGenerator.");
    KeyPairGenerator kpg = (action.spi instanceof KeyPairGenerator) ? (KeyPairGenerator)action.spi :
      new KeyPairGeneratorSpiWrapper((KeyPairGeneratorSpi)action.spi, algorithm);
    kpg.provider = action.provider;
    return kpg;
  }

 public static KeyPairGenerator getInstance(String algorithm, String provider)
 throws NoSuchAlgorithmException, NoSuchProviderException {
 SecurityAction action = new SecurityAction(algorithm, provider, "KeyPairGenerator.");
 KeyPairGenerator kpg = (action.spi instanceof KeyPairGenerator) ? (KeyPairGenerator)action.spi :
   new KeyPairGeneratorSpiWrapper((KeyPairGeneratorSpi)action.spi, algorithm);
 kpg.provider = action.provider;
 return kpg;
}

 public static KeyPairGenerator getInstance(String algorithm, Provider provider)
   throws NoSuchAlgorithmException {
   SecurityAction action = new SecurityAction(algorithm, provider, "KeyPairGenerator.");
   KeyPairGenerator kpg = (action.spi instanceof KeyPairGenerator) ? (KeyPairGenerator)action.spi :
     new KeyPairGeneratorSpiWrapper((KeyPairGeneratorSpi)action.spi, algorithm);
   kpg.provider = provider;
   return kpg;
  }

  private Provider provider;
  private String algorithm;

  protected KeyPairGenerator(String algorithm){
    this.algorithm = algorithm;
  }

  public final KeyPair genKeyPair(){
    return generateKeyPair();
  }

  public KeyPair generateKeyPair(){
    //it is unclear what the default behaviour should be.This method should be overriden to do something usefull
    throw new UnsupportedOperationException("KeyPairGenerator generateKeyPair "+this.getClass());
  }

  public String getAlgorithm(){
    return algorithm;
  }

  public final Provider getProvider(){
    return provider;
  }

  public void initialize(AlgorithmParameterSpec params) throws InvalidAlgorithmParameterException {
    throw new UnsupportedOperationException("KeyPairGenerator initialize(AlgorithmParameterSpec) "+this.getClass());
  }

  public void initialize(AlgorithmParameterSpec params, SecureRandom random) throws InvalidAlgorithmParameterException {
    throw new UnsupportedOperationException("KeyPairGenerator initialize(AlgorithmParameterSpec,SecureRandom) "+this.getClass());
  }

  public void initialize(int keysize){
    initialize(keysize, new SecureRandom());
  }

  public void initialize(int keysize, SecureRandom random){
    throw new UnsupportedOperationException("KeyPairGenerator initialize(int,SecureRandom) "+this.getClass());
  }
}