# Class TerminalFactory

java.lang.Object
javax.smartcardio.TerminalFactory

public final class TerminalFactory extends Object
A factory for CardTerminal objects. It allows an application to

- obtain a TerminalFactory by calling one of the static factory methods in this class (getDefault() or getInstance()).
- use this TerminalFactory object to access the CardTerminals by calling the terminals() method.

Each TerminalFactory has a `type` indicating how it was implemented. It must be specified when the implementation is obtained using a getInstance() method and can be retrieved via the getType() method.

The following standard type names have been defined:

`PC/SC`
  an implementation that calls into the PC/SC Smart Card stack of the host platform. Implementations do not require parameters and accept "null" as argument in the getInstance() calls.
`None`
  an implementation that does not supply any CardTerminals. On platforms that do not support other implementations, getDefaultType() returns `None` and getDefault() returns an instance of a `None` TerminalFactory. Factories of this type cannot be obtained by calling the `getInstance()` methods.

Additional standard types may be defined in the future.

Note: Provider implementations that accept initialization parameters via the `getInstance()` methods are strongly encouraged to use a Properties object as the representation for String name-value pair based parameters whenever possible. This allows applications to more easily interoperate with multiple providers than if each provider used different provider specific class as parameters.

TerminalFactory utilizes an extensible service provider framework. Service providers that wish to add a new implementation should see the TerminalFactorySpi class for more information.

Since:
  1.6
See Also:
  - `CardTerminals`
  - `Provider`

## Method Summary

Modifier and Type
Method
Description
`static TerminalFactory`
`getDefault()`
Returns the default TerminalFactory instance.
`static String`
`getDefaultType()`
Get the default TerminalFactory type.
`static TerminalFactory`
`getInstance(String type, Object params)`
Returns a TerminalFactory of the specified type that is initialized with the specified parameters.
`static TerminalFactory`
`getInstance(String type, Object params, String provider)`
Returns a TerminalFactory of the specified type that is initialized with the specified parameters.
`static TerminalFactory`
`getInstance(String type, Object params, Provider provider)`
Returns a TerminalFactory of the specified type that is initialized with the specified parameters.
`Provider`
`getProvider()`
Returns the provider of this TerminalFactory.
`String`
`getType()`
Returns the type of this TerminalFactory.
`CardTerminals`
`terminals()`
Returns a new CardTerminals object encapsulating the terminals supported by this factory.
`String`
`toString()`
Returns a string representation of this TerminalFactory.

### Methods declared in class Object

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

## Method Details

### getDefaultType

public static String getDefaultType()
Get the default TerminalFactory type.

It is determined as follows: when this class is initialized, the system property `javax.smartcardio.TerminalFactory.DefaultType` is examined. If it is set, a TerminalFactory of this type is instantiated by calling the getInstance(String,Object) method passing `null` as the value for `params`. If the call succeeds, the type becomes the default type and the factory becomes the default factory.

If the system property is not set or the getInstance() call fails for any reason, the system defaults to an implementation specific default type and TerminalFactory.

Returns:
  the default TerminalFactory type

### getDefault

public static TerminalFactory getDefault()
Returns the default TerminalFactory instance. See getDefaultType() for more information.

A default TerminalFactory is always available. However, depending on the implementation, it may not offer any terminals.

Returns:
  the default TerminalFactory

### getInstance

public static TerminalFactory getInstance(String type, Object params) throws NoSuchAlgorithmException
Returns a TerminalFactory of the specified type that is initialized with the specified parameters.

This method traverses the list of registered security Providers, starting with the most preferred Provider. A new TerminalFactory object encapsulating the TerminalFactorySpi implementation from the first Provider that supports the specified type is returned.

Note that the list of registered providers may be retrieved via the Security.getProviders() method.

The `TerminalFactory` is initialized with the specified parameters Object. The type of parameters needed may vary between different types of `TerminalFactory`s.

Implementation Note:
  The JDK Reference Implementation additionally uses the `jdk.security.provider.preferred` `Security` property to determine the preferred provider order for the specified algorithm. This may be different than the order of providers returned by `Security.getProviders()`.
Parameters:
  `type` - the type of the requested TerminalFactory
  `params` - the parameters to pass to the TerminalFactorySpi implementation, or null if no parameters are needed
Returns:
  a TerminalFactory of the specified type
Throws:
  `NullPointerException` - if type is null
  `NoSuchAlgorithmException` - if no Provider supports a TerminalFactorySpi of the specified type

### getInstance

public static TerminalFactory getInstance(String type, Object params, String provider) throws NoSuchAlgorithmException, NoSuchProviderException
Returns a TerminalFactory of the specified type that is initialized with the specified parameters.

A new TerminalFactory object encapsulating the TerminalFactorySpi implementation from the specified provider is returned. The specified provider must be registered in the security provider list.

Note that the list of registered providers may be retrieved via the Security.getProviders() method.

The `TerminalFactory` is initialized with the specified parameters Object. The type of parameters needed may vary between different types of `TerminalFactory`s.

Parameters:
  `type` - the type of the requested TerminalFactory
  `params` - the parameters to pass to the TerminalFactorySpi implementation, or null if no parameters are needed
  `provider` - the name of the provider
Returns:
  a TerminalFactory of the specified type
Throws:
  `NullPointerException` - if type is null
  `IllegalArgumentException` - if provider is null or the empty String
  `NoSuchAlgorithmException` - if a TerminalFactorySpi implementation of the specified type is not available from the specified provider
  `NoSuchAlgorithmException` - if no TerminalFactory of the specified type could be found
  `NoSuchProviderException` - if the specified provider could not be found

### getInstance

public static TerminalFactory getInstance(String type, Object params, Provider provider) throws NoSuchAlgorithmException
Returns a TerminalFactory of the specified type that is initialized with the specified parameters.

A new TerminalFactory object encapsulating the TerminalFactorySpi implementation from the specified provider object is returned. Note that the specified provider object does not have to be registered in the provider list.

The `TerminalFactory` is initialized with the specified parameters Object. The type of parameters needed may vary between different types of `TerminalFactory`s.

Parameters:
  `type` - the type of the requested TerminalFactory
  `params` - the parameters to pass to the TerminalFactorySpi implementation, or null if no parameters are needed
  `provider` - the provider
Returns:
  a TerminalFactory of the specified type
Throws:
  `NullPointerException` - if type is null
  `IllegalArgumentException` - if provider is null
  `NoSuchAlgorithmException` - if a TerminalFactorySpi implementation of the specified type is not available from the specified Provider

### getProvider

public Provider getProvider()
Returns the provider of this TerminalFactory.

Returns:
  the provider of this TerminalFactory.

### getType

public String getType()
Returns the type of this TerminalFactory. This is the value that was specified in the getInstance() method that returned this object.

Returns:
  the type of this TerminalFactory

### terminals

public CardTerminals terminals()
Returns a new CardTerminals object encapsulating the terminals supported by this factory. See the class comment of the CardTerminals class regarding how the returned objects can be shared and reused.

Returns:
  a new CardTerminals object encapsulating the terminals supported by this factory.

### toString

public String toString()
Returns a string representation of this TerminalFactory.

Overrides:
  `toString` in class `Object`
Returns:
  a string representation of this TerminalFactory.