org.cdlib.xtf.textEngine
Class FlippingDirectory

Object
  Directory
      FlippingDirectory

public class FlippingDirectory
extends Directory

Represents a Lucene directory in every way except that it allows the underlying directory pointer to be flipped. This facilitates warming a directory in the background before flipping it to the foreground.

Author:

Martin Haye

Field Summary

private Directory

wrapped

Fields inherited from class Directory

lockFactory

Constructor Summary

FlippingDirectory(Directory toWrap)
Wrap a directory to start with

Method Summary

void	clearLock(String name)
void	close()
IndexOutput	createOutput(String name)
void	deleteFile(String name)
boolean	fileExists(String name)
long	fileLength(String name)
long	fileModified(String name)
void	flipTo(Directory other) Switch to a different underlying directory.
LockFactory	getLockFactory()
String	getLockID()
String[]	list()
Lock	makeLock(String name)
IndexInput	openInput(String name)
void	renameFile(String from, String to)
void	setLockFactory(LockFactory lockFactory)
void	touchFile(String name)

Methods inherited from class Directory

copy

Methods inherited from class Object

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

Field Detail

wrapped

private Directory wrapped

Constructor Detail

FlippingDirectory

public FlippingDirectory(Directory toWrap)

Wrap a directory to start with

Method Detail

flipTo

public void flipTo(Directory other)

Switch to a different underlying directory. Note that it should still contain the same files, and thus should be the old directory with a simply a different name.

clearLock

public void clearLock(String name)
               throws IOException

Overrides:

clearLock in class Directory

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in class Directory

Throws:

IOException

createOutput

public IndexOutput createOutput(String name)
                         throws IOException

Specified by:

createOutput in class Directory

Throws:

IOException

deleteFile

public void deleteFile(String name)
                throws IOException

Specified by:

deleteFile in class Directory

Throws:

IOException

fileExists

public boolean fileExists(String name)
                   throws IOException

Specified by:

fileExists in class Directory

Throws:

IOException

fileLength

public long fileLength(String name)
                throws IOException

Specified by:

fileLength in class Directory

Throws:

IOException

fileModified

public long fileModified(String name)
                  throws IOException

Specified by:

fileModified in class Directory

Throws:

IOException

getLockFactory

public LockFactory getLockFactory()

Overrides:

getLockFactory in class Directory

getLockID

public String getLockID()

Overrides:

getLockID in class Directory

list

public String[] list()
              throws IOException

Specified by:

list in class Directory

Throws:

IOException

makeLock

public Lock makeLock(String name)

Overrides:

makeLock in class Directory

openInput

public IndexInput openInput(String name)
                     throws IOException

Specified by:

openInput in class Directory

Throws:

IOException

renameFile

public void renameFile(String from,
                       String to)
                throws IOException

Specified by:

renameFile in class Directory

Throws:

IOException

setLockFactory

public void setLockFactory(LockFactory lockFactory)

Overrides:

setLockFactory in class Directory

touchFile

public void touchFile(String name)
               throws IOException

Specified by:

touchFile in class Directory

Throws:

IOException