public class FileSwitchDirectory extends Directory
Files with the specified extensions are placed in the primary directory; others are placed in the secondary directory. The provided Set must not change once passed to this class, and must allow multiple threads to call contains at once.
Directory.IndexInputSlicer
isOpen, lockFactory
Constructor and Description |
---|
FileSwitchDirectory(Set<String> primaryExtensions,
Directory primaryDir,
Directory secondaryDir,
boolean doClose) |
Modifier and Type | Method and Description |
---|---|
void |
close()
Closes the store.
|
IndexOutput |
createOutput(String name,
IOContext context)
Creates a new, empty file in the directory with the given name.
|
Directory.IndexInputSlicer |
createSlicer(String name,
IOContext context)
Creates an
Directory.IndexInputSlicer for the given file name. |
void |
deleteFile(String name)
Removes an existing file in the directory.
|
boolean |
fileExists(String name)
Returns true iff a file with the given name exists.
|
long |
fileLength(String name)
Returns the length of a file in the directory.
|
static String |
getExtension(String name)
Utility method to return a file's extension.
|
Directory |
getPrimaryDir()
Return the primary directory
|
Directory |
getSecondaryDir()
Return the secondary directory
|
String[] |
listAll()
Returns an array of strings, one for each file in the directory.
|
IndexInput |
openInput(String name,
IOContext context)
Returns a stream reading an existing file, with the
specified read buffer size.
|
void |
sync(Collection<String> names)
Ensure that any writes to these files are moved to
stable storage.
|
clearLock, copy, ensureOpen, getLockFactory, getLockID, makeLock, setLockFactory, toString
public Directory getPrimaryDir()
public Directory getSecondaryDir()
public void close() throws IOException
Directory
close
in interface Closeable
close
in class Directory
IOException
public String[] listAll() throws IOException
Directory
listAll
in class Directory
NoSuchDirectoryException
- if the directory is not prepared for any
write operations (such as Directory.createOutput(String, IOContext)
).IOException
- in case of other IO errorspublic static String getExtension(String name)
public boolean fileExists(String name) throws IOException
Directory
fileExists
in class Directory
IOException
public void deleteFile(String name) throws IOException
Directory
deleteFile
in class Directory
IOException
public long fileLength(String name) throws IOException
Directory
FileNotFoundException
if the file does not exist
fileLength
in class Directory
name
- the name of the file for which to return the length.FileNotFoundException
- if the file does not exist.IOException
- if there was an IO error while retrieving the file's
length.public IndexOutput createOutput(String name, IOContext context) throws IOException
Directory
createOutput
in class Directory
IOException
public void sync(Collection<String> names) throws IOException
Directory
sync
in class Directory
IOException
public IndexInput openInput(String name, IOContext context) throws IOException
Directory
FSDirectory
and CompoundFileDirectory
.openInput
in class Directory
IOException
public Directory.IndexInputSlicer createSlicer(String name, IOContext context) throws IOException
Directory
Directory.IndexInputSlicer
for the given file name.
IndexInputSlicer allows other Directory
implementations to
efficiently open one or more sliced IndexInput
instances from a
single file handle. The underlying file handle is kept open until the
Directory.IndexInputSlicer
is closed.createSlicer
in class Directory
IOException
- if an IOException
occursCopyright © 2000-2012 Apache Software Foundation. All Rights Reserved.