org.datanucleus.plugin
Interface PluginRegistry

All Known Implementing Classes:

EclipsePluginRegistry, NonManagedPluginRegistry

public interface PluginRegistry

Loader and registry of Extensions and Extension Points. The implementation of this interface must have a public constructor taking the ClassLoaderResolver interface as argument. The plugin registry metadata/bundle resolution is ruled by OSGi specification. The following sections of the OSGi 3.0 specification must be fully supported: 3.5.2, 3.5.3, 3.2.4, 3.2.5. The section 3.6.3 is optional. All other OSGi parts not mentioned above are not likely to be supported.

Method Summary

java.lang.Object	createExecutableExtension(ConfigurationElement confElm, java.lang.String name, java.lang.Class[] argsClass, java.lang.Object[] args) Loads a class (do not initialize) from an attribute of ConfigurationElement
Bundle[]	getBundles() Accessor for all registered bundles
ExtensionPoint	getExtensionPoint(java.lang.String id) Acessor for the ExtensionPoint
ExtensionPoint[]	getExtensionPoints() Acessor for the currently registed ExtensionPoints
java.lang.Class	loadClass(java.lang.String pluginId, java.lang.String className) Loads a class (do not initialize)
void	registerExtensionPoints() Look for Bundles/Plugins and register them.
void	registerExtensions() Look for Bundles/Plugins and register them.
void	resolveConstraints() Resolve constraints declared in bundle manifest.mf files.
java.net.URL	resolveURLAsFileURL(java.net.URL url) Converts a URL that uses a user-defined protocol into a URL that uses the file protocol.

Method Detail

getExtensionPoint

ExtensionPoint getExtensionPoint(java.lang.String id)

Acessor for the ExtensionPoint

Parameters:

id - the unique id of the extension point

Returns:

null if the ExtensionPoint is not registered

getExtensionPoints

ExtensionPoint[] getExtensionPoints()

Acessor for the currently registed ExtensionPoints

Returns:

array of ExtensionPoints

registerExtensionPoints

void registerExtensionPoints()

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

registerExtensions

void registerExtensions()

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

createExecutableExtension

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

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

Parameters:

confElm - the configuration element

name - the attribute name

Returns:

the Class

Throws:

java.lang.ClassNotFoundException

java.lang.SecurityException

java.lang.NoSuchMethodException

java.lang.IllegalArgumentException

java.lang.InstantiationException

java.lang.IllegalAccessException

java.lang.reflect.InvocationTargetException

loadClass

java.lang.Class loadClass(java.lang.String pluginId,
                          java.lang.String className)
                          throws java.lang.ClassNotFoundException

Loads a class (do not initialize)

Parameters:

pluginId - the plugin id

className - the class name

Returns:

the Class

Throws:

java.lang.ClassNotFoundException

resolveURLAsFileURL

java.net.URL resolveURLAsFileURL(java.net.URL url)
                                 throws java.io.IOException

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

Parameters:

url - the url to be converted

Returns:

the converted URL

Throws:

java.io.IOException

resolveConstraints

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.

getBundles

Bundle[] getBundles()

Accessor for all registered bundles

Returns:

the bundles

Throws:

java.lang.UnsupportedOperationException - if this operation is not supported by the implementation