Delegate(KeyPairGeneratorSpi spi,
    String algorithm) 
{
        // constructor
            super(algorithm);
            this.spi = spi;
}

 Delegate(Instance instance,
    Iterator serviceIterator,
    String algorithm) 
{
            super(algorithm);
            spi = (KeyPairGeneratorSpi)instance.impl;
            provider = instance.provider;
            this.serviceIterator = serviceIterator;
            initType = I_NONE;
}

  void disableFailover() 
{
            serviceIterator = null;
            initType = 0;
            initParams = null;
            initRandom = null;
}

 public KeyPair generateKeyPair() 
{
            if (serviceIterator == null) {
                return spi.generateKeyPair();
            }
            RuntimeException failure = null;
            KeyPairGeneratorSpi mySpi = spi;
            do {
                try {
                    return mySpi.generateKeyPair();
                } catch (RuntimeException e) {
                    if (failure == null) {
                        failure = e;
                    }
                    mySpi = nextSpi(mySpi, true);
                }
            } while (mySpi != null);
            throw failure;
}

 public  void initialize(int keysize,
    SecureRandom random) 
{
            if (serviceIterator == null) {
                spi.initialize(keysize, random);
                return;
            }
            RuntimeException failure = null;
            KeyPairGeneratorSpi mySpi = spi;
            do {
                try {
                    mySpi.initialize(keysize, random);
                    initType = I_SIZE;
                    initKeySize = keysize;
                    initParams = null;
                    initRandom = random;
                    return;
                } catch (RuntimeException e) {
                    if (failure == null) {
                        failure = e;
                    }
                    mySpi = nextSpi(mySpi, false);
                }
            } while (mySpi != null);
            throw failure;
}

 public  void initialize(AlgorithmParameterSpec params,
    SecureRandom random) throws InvalidAlgorithmParameterException 
{
            if (serviceIterator == null) {
                spi.initialize(params, random);
                return;
            }
            Exception failure = null;
            KeyPairGeneratorSpi mySpi = spi;
            do {
                try {
                    mySpi.initialize(params, random);
                    initType = I_PARAMS;
                    initKeySize = 0;
                    initParams = params;
                    initRandom = random;
                    return;
                } catch (Exception e) {
                    if (failure == null) {
                        failure = e;
                    }
                    mySpi = nextSpi(mySpi, false);
                }
            } while (mySpi != null);
            if (failure instanceof RuntimeException) {
                throw (RuntimeException)failure;
            }
            // must be an InvalidAlgorithmParameterException
            throw (InvalidAlgorithmParameterException)failure;
}