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## javax.imageio.spi
Class IIOServiceProvider

    java.lang.Object
      |
      +--javax.imageio.spi.IIOServiceProvider

All Implemented Interfaces:
  RegisterableService

Direct Known Subclasses:
  ImageInputStreamSpi, ImageOutputStreamSpi, ImageReaderWriterSpi, ImageTranscoderSpi

public abstract class IIOServiceProvider
extends Object
implements RegisterableService

A superinterface for functionality common to all Image I/O service provider interfaces (SPIs). For more information on service provider classes, see the class comment for the `IIORegistry` class.

See Also:
  `IIORegistry`, `ImageReaderSpi`, `ImageWriterSpi`, `ImageTranscoderSpi`, `ImageInputStreamSpi`

Field Summary
`protected String` | `vendorName` A `String` to be returned from `getVendorName`, initially `null`.
`protected String` | `version` A `String` to be returned from `getVersion`, initially null.

Constructor Summary
`IIOServiceProvider()` Constructs a blank `IIOServiceProvider`.
`IIOServiceProvider(String vendorName, String version)` Constructs an `IIOServiceProvider` with a given vendor name and version identifier.

Method Summary
`abstract String` | `getDescription(Locale locale)` Returns a brief, human-readable description of this service provider and its associated implementation.
`String` | `getVendorName()` Returns the name of the vendor responsible for creating this service provider and its associated implementation.
`String` | `getVersion()` Returns a string describing the version number of this service provider and its associated implementation.
`void` | `onDeregistration(ServiceRegistry registry, Class category)` A callback that will be whenever the Spi class has been deregistered from a `ServiceRegistry`.
`void` | `onRegistration(ServiceRegistry registry, Class category)` A callback that will be called exactly once after the Spi class has been instantiated and registered in a `ServiceRegistry`.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### vendorName

    protected String vendorName

  A `String` to be returned from `getVendorName`, initially `null`. Constructors should set this to a non-`null` value.

### version

    protected String version

  A `String` to be returned from `getVersion`, initially null. Constructors should set this to a non-`null` value.

Constructor Detail

### IIOServiceProvider

    public IIOServiceProvider(String vendorName,
                              String version)

  Constructs an `IIOServiceProvider` with a given vendor name and version identifier.

Parameters:
  `vendorName` - the vendor name.
  `version` - a version identifier.
Throws:
  `IllegalArgumentException` - if `vendorName` is `null`.
  `IllegalArgumentException` - if `version` is `null`.

### IIOServiceProvider

    public IIOServiceProvider()

  Constructs a blank `IIOServiceProvider`. It is up to the subclass to initialize instance variables and/or override method implementations in order to ensure that the `getVendorName` and `getVersion` methods will return non-`null` values.

Method Detail

### onRegistration

    public void onRegistration(ServiceRegistry registry,
                               Class category)

  A callback that will be called exactly once after the Spi class has been instantiated and registered in a `ServiceRegistry`. This may be used to verify that the environment is suitable for this service, for example that native libraries can be loaded. If the service cannot function in the environment where it finds itself, it should deregister itself from the registry.

  Only the registry should call this method.

  The default implementation does nothing.

  Specified by:
    `onRegistration` in interface `RegisterableService`
  Parameters:
    `registry` - a `ServiceRegistry` where this object has been registered.
    `category` - a `Class` object indicating the registry category under which this object has been registered.
  See Also:
    `ServiceRegistry.registerServiceProvider(Object provider)`

### onDeregistration

    public void onDeregistration(ServiceRegistry registry,
                                 Class category)

  A callback that will be whenever the Spi class has been deregistered from a `ServiceRegistry`.

  Only the registry should call this method.

  The default implementation does nothing.

  Specified by:
    `onDeregistration` in interface `RegisterableService`
  Parameters:
    `registry` - a `ServiceRegistry` from which this object is being (wholly or partially) deregistered.
    `category` - a `Class` object indicating the registry category from which this object is being deregistered.
  See Also:
    `ServiceRegistry.deregisterServiceProvider(Object provider)`

### getVendorName

    public String getVendorName()

  Returns the name of the vendor responsible for creating this service provider and its associated implementation. Because the vendor name may be used to select a service provider, it is not localized.

  The default implementation returns the value of the `vendorName` instance variable.

  Returns:
    a non-`null` `String` containing the name of the vendor.

### getVersion

    public String getVersion()

  Returns a string describing the version number of this service provider and its associated implementation. Because the version may be used by transcoders to identify the service providers they understand, this method is not localized.

  The default implementation returns the value of the `version` instance variable.

  Returns:
    a non-`null` `String` containing the version of this service provider.

### getDescription

    public abstract String getDescription(Locale locale)

  Returns a brief, human-readable description of this service provider and its associated implementation. The resulting string should be localized for the supplied `Locale`, if possible.

  Parameters:
    `locale` - a `Locale` for which the return value should be localized.
  Returns:
    a `String` containing a description of this service provider.

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.