org.apache.sling.commons.classloader

Interface ClassLoaderWriter

public interface ClassLoaderWriter

A class loader writer is a service allowing to dynamically generate classes and resources. It provides methods for writing, removing, and moving resources. In addition it provides a dynamic class loader which can be used to dynamically load generated classes. For example a class loader writer could write generated class files into the repository or the temporary file system.

Method Summary

Modifier and Type	Method and Description
boolean	delete(String path) Delete the class/resource
ClassLoader	getClassLoader() Get a dynamic class loader.
InputStream	getInputStream(String path) Get the input stream for a class or resource handled by the underlying class loader.
long	getLastModified(String path) Return the last modified for the class or resource.
OutputStream	getOutputStream(String path) Get the output stream for a class or resource handled by the underlying class loader.
boolean	rename(String oldPath, String newPath) Rename a class/resource.

Method Detail

getOutputStream

OutputStream getOutputStream(String path)

Get the output stream for a class or resource handled by the underlying class loader. If the resource/class does not exists it should be created.

Parameters:

path - The path of the class/resource. The path should be absolute like /com/my/domain/HelloWorld.class

Returns:

The output stream.

getInputStream

InputStream getInputStream(String path)
                    throws IOException

Get the input stream for a class or resource handled by the underlying class loader.

Parameters:

path - The path of the class/resource. The path should be absolute like /com/my/domain/HelloWorld.class

Returns:

The input stream for the resource/class.

Throws:

IOException - If the resource/class does not exist.

getLastModified

long getLastModified(String path)

Return the last modified for the class or resource.

Parameters:

path - The path of the class/resource. The path should be absolute like /com/my/domain/HelloWorld.class

Returns:

The last modified information or -1 if the information can't be detected.

delete

boolean delete(String path)

Delete the class/resource

Parameters:

path - The path of the class/resource. The path should be absolute like /com/my/domain/HelloWorld.class

Returns:

true if the resource exists and could be deleted, false otherwise.

rename

boolean rename(String oldPath,
               String newPath)

Rename a class/resource. The paths should be absolute like /com/my/domain/HelloWorld.class

Parameters:

oldPath - The path of the class/resource.

newPath - The new path.

Returns:

true if the renaming has been successful.

getClassLoader

ClassLoader getClassLoader()

Get a dynamic class loader. The returned class loader can be used to load classes and resources generated through this class loader writer. The parent of this class loader is a class loader from the DynamicClassLoaderManager. The class loader returned by this method should not be cached, as it might get stale (e.g. used classes are removed etc.). Therefore each time a newly generated class is loaded, the class loader should be fetched again using this method. The implementation might cache the class loader and return the same loader on subsequent calls for as long as possible. Clients of the class loader can use the DynamicClassLoader.isLive() method to check if the fetched instance can still be used.

Returns:

A dynamic class loader implementing DynamicClassLoader

Since:

1.3