Module org.datanucleus

Package org.datanucleus.plugin

Class OSGiPluginRegistry

java.lang.Object

org.datanucleus.plugin.OSGiPluginRegistry

All Implemented Interfaces:

PluginRegistry

public class OSGiPluginRegistry
extends Object
implements PluginRegistry

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected static class	OSGiPluginRegistry.ExtensionSorter	Sorter for extensions that puts DataNucleus extensions first, then any vendor extension.

Constructor Summary

Constructors

Constructor	Description
OSGiPluginRegistry(ClassLoaderResolver clr)	Constructor

Method Summary

Modifier and Type	Method	Description
Object	createExecutableExtension(ConfigurationElement confElm, String name, Class[] argsClass, Object[] args)	Loads a class (do not initialize) from an attribute of ConfigurationElement
Bundle[]	getBundles()	Accessor for all registered bundles.
ExtensionPoint	getExtensionPoint(String id)	Accessor for the ExtensionPoint with the specified id.
ExtensionPoint[]	getExtensionPoints()	Acessor for the currently registed ExtensionPoints
Class	loadClass(String pluginId, String className)	Loads a class (do not initialize)
void	registerExtensionPoints()	Look for Bundles/Plugins and register them.
protected void	registerExtensionPointsForPluginInternal(List extPoints, boolean updateExtensionPointsArray)	Register extension-points for the specified plugin.
void	registerExtensions()	Look for Bundles/Plugins and register them.
void	resolveConstraints()	Resolve constraints declared in bundle manifest.mf files.
URL	resolveURLAsFileURL(URL url)	Converts a URL that uses a user-defined protocol into a URL that uses the file protocol.

Methods inherited from class java.lang.Object

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

Constructor Detail

OSGiPluginRegistry

public OSGiPluginRegistry(ClassLoaderResolver clr)

Constructor

Parameters:

clr - the ClassLoaderResolver

Method Detail

getExtensionPoint

public ExtensionPoint getExtensionPoint(String id)

Accessor for the ExtensionPoint with the specified id.

Specified by:

getExtensionPoint in interface PluginRegistry

Parameters:

id - the unique id of the extension point

Returns:

null if the ExtensionPoint is not registered

getExtensionPoints

public ExtensionPoint[] getExtensionPoints()

Description copied from interface: PluginRegistry

Acessor for the currently registed ExtensionPoints

Specified by:

getExtensionPoints in interface PluginRegistry

Returns:

array of ExtensionPoints

registerExtensionPoints

public void registerExtensionPoints()

Look for Bundles/Plugins and register them. Register also ExtensionPoints and Extensions declared in "/plugin.xml" files

Specified by:

registerExtensionPoints in interface PluginRegistry

registerExtensions

public void registerExtensions()

Description copied from interface: PluginRegistry

Look for Bundles/Plugins and register them. Register also ExtensionPoints and Extensions declared in /plugin.xml files

Specified by:

registerExtensions in interface PluginRegistry

registerExtensionPointsForPluginInternal

protected void registerExtensionPointsForPluginInternal(List extPoints,
                                                        boolean updateExtensionPointsArray)

Register extension-points for the specified plugin.

Parameters:

extPoints - ExtensionPoints for this plugin

updateExtensionPointsArray - Whether to update "extensionPoints" array

createExecutableExtension

public Object createExecutableExtension(ConfigurationElement confElm,
                                        String name,
                                        Class[] argsClass,
                                        Object[] args)
                                 throws ClassNotFoundException,
                                        SecurityException,
                                        NoSuchMethodException,
                                        IllegalArgumentException,
                                        InstantiationException,
                                        IllegalAccessException,
                                        InvocationTargetException

Loads a class (do not initialize) from an attribute of ConfigurationElement

Specified by:

createExecutableExtension in interface PluginRegistry

Parameters:

confElm - the configuration element

name - the attribute name

argsClass - Classes of the args

args - The arguments

Returns:

the Class

Throws:

NoSuchMethodException - if an error occurs

SecurityException - if an error occurs

InvocationTargetException - if an error occurs

IllegalAccessException - if an error occurs

InstantiationException - if an error occurs

IllegalArgumentException - if an error occurs

ClassNotFoundException - If an error occurs

loadClass

public Class loadClass(String pluginId,
                       String className)
                throws ClassNotFoundException

Loads a class (do not initialize)

Specified by:

loadClass in interface PluginRegistry

Parameters:

pluginId - the plugin id

className - the class name

Returns:

the Class

Throws:

ClassNotFoundException - if there is a problem in loading

resolveURLAsFileURL

public URL resolveURLAsFileURL(URL url)
                        throws IOException

Description copied from interface: PluginRegistry

Converts a URL that uses a user-defined protocol into a URL that uses the file protocol.

Specified by:

resolveURLAsFileURL in interface PluginRegistry

Parameters:

url - the url to be converted

Returns:

the converted URL

Throws:

IOException - if an error occurs

resolveConstraints

public void resolveConstraints()

Resolve constraints declared in bundle manifest.mf files. This must be invoked after registering all bundles. Should log errors if bundles are not resolvable, or raise runtime exceptions.

Specified by:

resolveConstraints in interface PluginRegistry

getBundles

public Bundle[] getBundles()

Accessor for all registered bundles.

Specified by:

getBundles in interface PluginRegistry

Returns:

the bundles

Throws:

UnsupportedOperationException - if this operation is not supported by the implementation