Package com.twelvemonkeys.servlet.image

Class IIOProviderContextListener

java.lang.Object

com.twelvemonkeys.servlet.image.IIOProviderContextListener

All Implemented Interfaces:

java.util.EventListener, javax.servlet.ServletContextListener

public final class IIOProviderContextListener
extends java.lang.Object
implements javax.servlet.ServletContextListener

Takes care of registering and de-registering local ImageIO plugins (service providers) for the servlet context.

Registers all available plugins on contextInitialized event, using ImageIO.scanForPlugins(), to make sure they are available to the current servlet context. De-registers all plugins which have the current thread's context class loader as its class loader on contextDestroyed event, to avoid class/resource leak.

Version:

$Id: IIOProviderContextListener.java,v 1.0 14.02.12 21:53 haraldk Exp$

See Also:

ImageIO.scanForPlugins()

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
(package private) static class	IIOProviderContextListener.LocalFilter

Constructor Summary

Constructors

Constructor	Description
IIOProviderContextListener()

Method Summary

Modifier and Type	Method	Description
void	contextDestroyed(javax.servlet.ServletContextEvent event)
void	contextInitialized(javax.servlet.ServletContextEvent event)
private static <T> void	deregisterLocalProvidersForCategory(javax.imageio.spi.IIORegistry registry, IIOProviderContextListener.LocalFilter localFilter, java.lang.Class<T> category, javax.servlet.ServletContext context)

Methods inherited from class java.lang.Object

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

Constructor Detail

IIOProviderContextListener

public IIOProviderContextListener()

Method Detail

contextInitialized

public void contextInitialized(javax.servlet.ServletContextEvent event)

Specified by:

contextInitialized in interface javax.servlet.ServletContextListener

contextDestroyed

public void contextDestroyed(javax.servlet.ServletContextEvent event)

Specified by:

contextDestroyed in interface javax.servlet.ServletContextListener

deregisterLocalProvidersForCategory

private static <T> void deregisterLocalProvidersForCategory(javax.imageio.spi.IIORegistry registry,
                                                            IIOProviderContextListener.LocalFilter localFilter,
                                                            java.lang.Class<T> category,
                                                            javax.servlet.ServletContext context)