IT. Expert System.

public class Engine
extends Object

   public class Foo {

       private static final Engine ENGINE = new Engine("Foo");

       private final FooSpi spi;
       private final Provider provider;
       private final String algorithm;

       protected Foo(FooSpi spi,
                     Provider provider,
                     String algorithm) {
           this.spi = spi;
           this.provider = provider;
           this.algorithm = algorithm;
       }

       public static Foo getInstance(String algorithm) {
           Engine.SpiAndProvider sap = ENGINE.getInstance(algorithm, null);
           return new Foo((FooSpi) sap.spi, sap.provider, algorithm);
       }

       public static Foo getInstance(String algorithm, Provider provider) {
           Object spi = ENGINE.getInstance(algorithm, provider, null);
           return new Foo((FooSpi) spi, provider, algorithm);
       }

       ...

 }

• Nested Class Summary

  Nested Classes

  Modifier and Type	Class and Description
  static class	Engine.SpiAndProvider

• Field Summary

  Fields

  Modifier and Type	Field and Description
  static SecurityAccess	door Access to package visible api in java.security

• Constructor Summary

  Constructors

  Constructor and Description
  Engine(String service) Creates a Engine object

• Method Summary

  Methods

  Modifier and Type	Method and Description
  Engine.SpiAndProvider	getInstance(String algorithm, Object param) Finds the appropriate service implementation and returns an SpiAndProvider instance containing a reference to SPI and its Provider
  Object	getInstance(String algorithm, Provider provider, Object param) Finds the appropriate service implementation and returns and instance of the class that implements corresponding Service Provider Interface.

  • Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

• Field Detail

  • door

    public static SecurityAccess door

    Access to package visible api in java.security

• Constructor Detail

  • Engine

    public Engine(String service)

    Creates a Engine object

    Parameters:

    service -

• Method Detail

  • getInstance

    public Engine.SpiAndProvider getInstance(String algorithm,
                                    Object param)
                                      throws NoSuchAlgorithmException

    Finds the appropriate service implementation and returns an SpiAndProvider instance containing a reference to SPI and its Provider

    Throws:

    NoSuchAlgorithmException

  • getInstance

    public Object getInstance(String algorithm,
                     Provider provider,
                     Object param)
                       throws NoSuchAlgorithmException

    Finds the appropriate service implementation and returns and instance of the class that implements corresponding Service Provider Interface.

    Throws:

    NoSuchAlgorithmException