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Java Source Code / Java Documentation » 6.0 JDK Core » image » javax.imageio.spi 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   javax.imageio.spi.ServiceRegistry
      javax.imageio.spi.IIORegistry

IIORegistry
final public class IIORegistry extends ServiceRegistry (Code)
A registry for service provider instances. Service provider classes may be detected at run time by means of meta-information in the JAR files containing them. The intent is that it be relatively inexpensive to load and inspect all available service provider classes. These classes may them be used to locate and instantiate more heavyweight classes that will perform actual work, in this case instances of ImageReader, ImageWriter, ImageTranscoder, ImageInputStream, and ImageOutputStream.

Service providers found on the system classpath (e.g., the jre/lib/ext directory in Sun's implementation of JDK) are automatically loaded as soon as this class is instantiated.

When the registerApplicationClasspathSpis method is called, service provider instances declared in the meta-information section of JAR files on the application class path are loaded. To declare a service provider, a services subdirectory is placed within the META-INF directory that is present in every JAR file. This directory contains a file for each service provider interface that has one or more implementation classes present in the JAR file. For example, if the JAR file contained a class named com.mycompany.imageio.MyFormatReaderSpi which implements the ImageReaderSpi interface, the JAR file would contain a file named:

 META-INF/services/javax.imageio.spi.ImageReaderSpi
 
containing the line:
 com.mycompany.imageio.MyFormatReaderSpi
 

The service provider classes are intended to be lightweight and quick to load. Implementations of these interfaces should avoid complex dependencies on other classes and on native code.

It is also possible to manually add service providers not found automatically, as well as to remove those that are using the interfaces of the ServiceRegistry class. Thus the application may customize the contents of the registry as it sees fit.

For more details on declaring service providers, and the JAR format in general, see the JAR File Specification.
version:
   0.5





Method Summary
public static  IIORegistrygetDefaultInstance()
     Returns the default IIORegistry instance used by the Image I/O API.
public  voidregisterApplicationClasspathSpis()
     Registers all available service providers found on the application class path, using the default ClassLoader.



Method Detail
getDefaultInstance
public static IIORegistry getDefaultInstance()(Code)
Returns the default IIORegistry instance used by the Image I/O API. This instance should be used for all registry functions.

Each ThreadGroup will receive its own instance; this allows different Applets in the same browser (for example) to each have their own registry. the default registry for the currentThreadGroup.




registerApplicationClasspathSpis
public void registerApplicationClasspathSpis()(Code)
Registers all available service providers found on the application class path, using the default ClassLoader. This method is typically invoked by the ImageIO.scanForPlugins method.
See Also:   javax.imageio.ImageIO.scanForPlugins
See Also:   ClassLoader.getResources



Methods inherited from javax.imageio.spi.ServiceRegistry
public boolean contains(Object provider)(Code)(Java Doc)
public void deregisterAll(Class category)(Code)(Java Doc)
public void deregisterAll()(Code)(Java Doc)
public boolean deregisterServiceProvider(T provider, Class<T> category)(Code)(Java Doc)
public void deregisterServiceProvider(Object provider)(Code)(Java Doc)
public void finalize() throws Throwable(Code)(Java Doc)
public Iterator<Class<?>> getCategories()(Code)(Java Doc)
public T getServiceProviderByClass(Class<T> providerClass)(Code)(Java Doc)
public Iterator<T> getServiceProviders(Class<T> category, boolean useOrdering)(Code)(Java Doc)
public Iterator<T> getServiceProviders(Class<T> category, Filter filter, boolean useOrdering)(Code)(Java Doc)
public static Iterator<T> lookupProviders(Class<T> providerClass, ClassLoader loader)(Code)(Java Doc)
public static Iterator<T> lookupProviders(Class<T> providerClass)(Code)(Java Doc)
public boolean registerServiceProvider(T provider, Class<T> category)(Code)(Java Doc)
public void registerServiceProvider(Object provider)(Code)(Java Doc)
public void registerServiceProviders(Iterator providers)(Code)(Java Doc)
public boolean setOrdering(Class<T> category, T firstProvider, T secondProvider)(Code)(Java Doc)
public boolean unsetOrdering(Class<T> category, T firstProvider, T secondProvider)(Code)(Java Doc)

Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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