Package org.apache.lucene.store

Class TrackingDirectoryWrapper

java.lang.Object

org.apache.lucene.store.Directory

org.apache.lucene.store.FilterDirectory

org.apache.lucene.store.TrackingDirectoryWrapper

All Implemented Interfaces:

Closeable, AutoCloseable

public final class TrackingDirectoryWrapper
extends FilterDirectory

A delegating Directory that records which files were written to and deleted.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.store.Directory

Directory.IndexInputSlicer

Constructor Summary

Constructors

Constructor	Description
TrackingDirectoryWrapper(Directory in)

Method Summary

Modifier and Type	Method	Description
void	copy(Directory to, String src, String dest, IOContext context)	Copies the file src to Directory to under the new file name dest.
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.
Set<String>	getCreatedFiles()

Methods inherited from class org.apache.lucene.store.FilterDirectory

clearLock, close, fileExists, fileLength, getDelegate, getLockFactory, getLockID, listAll, makeLock, openInput, setLockFactory, sync, toString

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

TrackingDirectoryWrapper

public TrackingDirectoryWrapper(Directory in)

Method Detail

deleteFile

public void deleteFile(String name)
                throws IOException

Description copied from class: Directory

Removes an existing file in the directory.

Overrides:

deleteFile in class FilterDirectory

Throws:

IOException

createOutput

public IndexOutput createOutput(String name,
                                IOContext context)
                         throws IOException

Description copied from class: Directory

Creates a new, empty file in the directory with the given name. Returns a stream writing this file.

Overrides:

createOutput in class FilterDirectory

Throws:

IOException

copy

public void copy(Directory to,
                 String src,
                 String dest,
                 IOContext context)
          throws IOException

Description copied from class: Directory

Copies the file src to Directory to under the new file name dest.

If you want to copy the entire source directory to the destination one, you can do so like this:

 Directory to; // the directory to copy to
 for (String file : dir.listAll()) {
   dir.copy(to, file, newFile, IOContext.DEFAULT); // newFile can be either file, or a new name
 }
 

NOTE: this method does not check whether dest exist and will overwrite it if it does.

Overrides:

copy in class Directory

Throws:

IOException

createSlicer

public Directory.IndexInputSlicer createSlicer(String name,
                                               IOContext context)
                                        throws IOException

Description copied from class: Directory

Creates an 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.

Must throw FileNotFoundException if the file does not exist (not java.nio.file.NoSuchFileException of Java 7).

Overrides:

createSlicer in class Directory

Throws:

IOException - if an IOException occurs

getCreatedFiles

public Set<String> getCreatedFiles()