Service providers that want to write a new implementation should define
* a concrete subclass of TerminalFactorySpi with a constructor that takes
* an Object as parameter. That class needs to be registered
* in a {@linkplain java.security.Provider}. The engine
* {@linkplain java.security.Provider.Service#getType type} is
* TerminalFactory.
* Service providers also need to implement subclasses of the abstract classes
* {@linkplain CardTerminals}, {@linkplain CardTerminal}, {@linkplain Card},
* and {@linkplain CardChannel}.
*
*
For example: *
file MyProvider.java:
*
* package com.somedomain.card;
*
* import java.security.Provider;
*
* public class MyProvider extends Provider {
* public MyProvider() {
* super("MyProvider", 1.0d, "Smart Card Example");
* put("TerminalFactory.MyType", "com.somedomain.card.MySpi");
* }
* }
*
*file MySpi.java
*
* package com.somedomain.card;
*
* import javax.smartcardio.*;
*
* public class MySpi extends TerminalFactoySpi {
* public MySpi(Object parameter) {
* // initialize as appropriate
* }
* protected CardTerminals engineTerminals() {
* // add implementation code here
* }
* }
*
*
* @see TerminalFactory
* @see java.security.Provider
*
* @since 1.6
* @author Andreas Sterbenz
* @author JSR 268 Expert Group
*/
public abstract class TerminalFactorySpi {
/**
* Constructs a new TerminalFactorySpi object.
*
* This class is part of the service provider interface and not accessed * directly by applications. Applications * should use TerminalFactory objects, which can be obtained by calling * one of the * {@linkplain TerminalFactory#getInstance TerminalFactory.getInstance()} * methods. * *
Concrete subclasses should define a constructor that takes an
* Object as parameter. It will be invoked when an
* application calls one of the {@linkplain TerminalFactory#getInstance
* TerminalFactory.getInstance()} methods and receives the params
* object specified by the application.
*/
protected TerminalFactorySpi() {
// empty
}
/**
* Returns the CardTerminals created by this factory.
*
* @return the CardTerminals created by this factory.
*/
protected abstract CardTerminals engineTerminals();
}