org.apache.hadoop.fs
Class FileContext.FSLinkResolver<T>

java.lang.Object
  org.apache.hadoop.fs.FileContext.FSLinkResolver<T>

Enclosing class:

FileContext

protected abstract class FileContext.FSLinkResolver<T>
extends Object

Class used to perform an operation on and resolve symlinks in a path. The operation may potentially span multiple file systems.

Constructor Summary

protected

FileContext.FSLinkResolver()

Method Summary

abstract T	next(AbstractFileSystem fs, Path p) Generic helper function overridden on instantiation to perform a specific operation on the given file system using the given path which may result in an UnresolvedLinkException.
T	resolve(FileContext fc, Path p) Performs the operation specified by the next function, calling it repeatedly until all symlinks in the given path are resolved.

Methods inherited from class java.lang.Object

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

Constructor Detail

FileContext.FSLinkResolver

protected FileContext.FSLinkResolver()

Method Detail

next

public abstract T next(AbstractFileSystem fs,
                       Path p)
                throws IOException,
                       org.apache.hadoop.fs.UnresolvedLinkException

Generic helper function overridden on instantiation to perform a specific operation on the given file system using the given path which may result in an UnresolvedLinkException.

Parameters:

fs - AbstractFileSystem to perform the operation on.

p - Path given the file system.

Returns:

Generic type determined by the specific implementation.

Throws:

org.apache.hadoop.fs.UnresolvedLinkException - If symbolic link path could not be resolved

IOException - an I/O error occured

resolve

public T resolve(FileContext fc,
                 Path p)
          throws IOException

Performs the operation specified by the next function, calling it repeatedly until all symlinks in the given path are resolved.

Parameters:

fc - FileContext used to access file systems.

p - The path to resolve symlinks in.

Returns:

Generic type determined by the implementation of next.

Throws:

IOException