org.eclipse.osgi.framework.adaptor
Interface ClassLoaderDelegateHook

public interface ClassLoaderDelegateHook

A ClassLoaderDelegateHook hooks into the ClassLoaderDelegate.

Since:

3.4

See Also:

ClassLoaderDelegate, HookRegistry.getClassLoaderDelegateHooks(), HookRegistry.addClassLoaderDelegateHook(ClassLoaderDelegateHook)

Method Summary

Class<?>	postFindClass(String name, BundleClassLoader classLoader, BundleData data) Called by a ClassLoaderDelegate.findClass(String) method after delegating to the resolved constraints and local bundle for a class load.
String	postFindLibrary(String name, BundleClassLoader classLoader, BundleData data) Called by a ClassLoaderDelegate after normal delegation.
URL	postFindResource(String name, BundleClassLoader classLoader, BundleData data) Called by a ClassLoaderDelegate after delegating to the resolved constraints and local bundle for a resource load.
Enumeration<URL>	postFindResources(String name, BundleClassLoader classLoader, BundleData data) Called by a ClassLoaderDelegate after delegating to the resolved constraints and local bundle for a resource load.
Class<?>	preFindClass(String name, BundleClassLoader classLoader, BundleData data) Called by a ClassLoaderDelegate.findClass(String) method before delegating to the resolved constraints and local bundle for a class load.
String	preFindLibrary(String name, BundleClassLoader classLoader, BundleData data) Called by a ClassLoaderDelegate before normal delegation.
URL	preFindResource(String name, BundleClassLoader classLoader, BundleData data) Called by a #findResource(String) before delegating to the resolved constraints and local bundle for a resource load.
Enumeration<URL>	preFindResources(String name, BundleClassLoader classLoader, BundleData data) Called by a ClassLoaderDelegate before delegating to the resolved constraints and local bundle for a resource load.

Method Detail

preFindClass

Class<?> preFindClass(String name,
                      BundleClassLoader classLoader,
                      BundleData data)
                      throws ClassNotFoundException

Called by a ClassLoaderDelegate.findClass(String) method before delegating to the resolved constraints and local bundle for a class load. If this method returns null then normal delegation is done. If this method returns a non-null value then the rest of the delegation process is skipped and the returned value is used. If this method throws a ClassNotFoundException then the calling ClassLoaderDelegate.findClass(String) method re-throws the exception.

Parameters:

name - the name of the class to find

classLoader - the bundle class loader

data - the bundle data

Returns:

the class found by this hook or null if normal delegation should continue

Throws:

ClassNotFoundException - to terminate the delegation and throw an exception

postFindClass

Class<?> postFindClass(String name,
                       BundleClassLoader classLoader,
                       BundleData data)
                       throws ClassNotFoundException

Called by a ClassLoaderDelegate.findClass(String) method after delegating to the resolved constraints and local bundle for a class load. This method will only be called if no class was found from the normal delegation.

Parameters:

name - the name of the class to find

classLoader - the bundle class loader

data - the bundle data

Returns:

the class found by this hook or null if normal delegation should continue

Throws:

ClassNotFoundException - to terminate the delegation and throw an exception

preFindResource

URL preFindResource(String name,
                    BundleClassLoader classLoader,
                    BundleData data)
                    throws FileNotFoundException

Called by a #findResource(String) before delegating to the resolved constraints and local bundle for a resource load. If this method returns null then normal delegation is done. If this method returns a non-null value then the rest of the delegation process is skipped and the returned value is used. If this method throws an FileNotFoundException then the delegation is terminated.

Parameters:

name - the name of the resource to find

classLoader - the bundle class loader

data - the bundle data

Returns:

the resource found by this hook or null if normal delegation should continue

Throws:

FileNotFoundException - to terminate the delegation

postFindResource

URL postFindResource(String name,
                     BundleClassLoader classLoader,
                     BundleData data)
                     throws FileNotFoundException

Called by a ClassLoaderDelegate after delegating to the resolved constraints and local bundle for a resource load. This method will only be called if no resource was found from the normal delegation.

Parameters:

name - the name of the resource to find

classLoader - the bundle class loader

data - the bundle data

Returns:

the resource found by this hook or null if normal delegation should continue

Throws:

FileNotFoundException - to terminate the delegation

preFindResources

Enumeration<URL> preFindResources(String name,
                                  BundleClassLoader classLoader,
                                  BundleData data)
                                  throws FileNotFoundException

Called by a ClassLoaderDelegate before delegating to the resolved constraints and local bundle for a resource load. If this method returns null then normal delegation is done. If this method returns a non-null value then the rest of the delegation process is skipped and the returned value is used. If this method throws an FileNotFoundException then the delegation is terminated

Parameters:

name - the name of the resource to find

classLoader - the bundle class loader

data - the bundle data

Returns:

the resources found by this hook or null if normal delegation should continue

Throws:

FileNotFoundException - to terminate the delegation

postFindResources

Enumeration<URL> postFindResources(String name,
                                   BundleClassLoader classLoader,
                                   BundleData data)
                                   throws FileNotFoundException

Called by a ClassLoaderDelegate after delegating to the resolved constraints and local bundle for a resource load. This method will only be called if no resources were found from the normal delegation.

Parameters:

name - the name of the resource to find

classLoader - the bundle class loader

data - the bundle data

Returns:

the resources found by this hook or null if normal delegation should continue

Throws:

FileNotFoundException - to terminate the delegation

preFindLibrary

String preFindLibrary(String name,
                      BundleClassLoader classLoader,
                      BundleData data)
                      throws FileNotFoundException

Called by a ClassLoaderDelegate before normal delegation. If this method returns a non-null value then the rest of the delegation process is skipped and the returned value is used.

Parameters:

name - the name of the library to find

classLoader - the bundle class loader

data - the bundle data

Returns:

the library found by this hook or null if normal delegation should continue

Throws:

FileNotFoundException - to terminate the delegation

postFindLibrary

String postFindLibrary(String name,
                       BundleClassLoader classLoader,
                       BundleData data)

Called by a ClassLoaderDelegate after normal delegation. This method will only be called if no library was found from the normal delegation.

Parameters:

name - the name of the library to find

classLoader - the bundle class loader

data - the bundle data

Returns:

the library found by this hook or null if normal delegation should continue