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.

- - ### Field Summary

    - ### Fields inherited from class org.apache.lucene.store.FilterDirectory

      `in`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `TrackingDirectoryWrapper(Directory in)`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `clearCreatedFiles()`
    `void` | `copyFrom(Directory from, String src, String dest, IOContext context)` Copies an existing `src` file from directory `from` to a non-existent file `dest` in this directory.
    `IndexOutput` | `createOutput(String name, IOContext context)` Creates a new, empty file in the directory and returns an `IndexOutput` instance for appending data to this file.
    `IndexOutput` | `createTempOutput(String prefix, String suffix, IOContext context)` Creates a new, empty, temporary file in the directory and returns an `IndexOutput` instance for appending data to this file.
    `void` | `deleteFile(String name)` Removes an existing file in the directory.
    `Set<String>` | `getCreatedFiles()` NOTE: returns a copy of the created files.
    `void` | `rename(String source, String dest)` Renames `source` file to `dest` file where `dest` must not already exist in the directory.

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

      `close, fileLength, getDelegate, getPendingDeletions, listAll, obtainLock, openInput, sync, syncMetaData, toString, unwrap`

    - ### Methods inherited from class org.apache.lucene.store.Directory

      `ensureOpen, openChecksumInput`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, 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. This method must throw either `NoSuchFileException` or `FileNotFoundException` if `name` points to a non-existing file.
      Overrides:
        `deleteFile` in class `FilterDirectory`
      Parameters:
        `name` - the name of an existing file.
      Throws:
        `IOException` - in case of I/O error

    - #### createOutput

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

      Description copied from class: `Directory`
      Creates a new, empty file in the directory and returns an `IndexOutput` instance for appending data to this file. This method must throw `FileAlreadyExistsException` if the file already exists.
      Overrides:
        `createOutput` in class `FilterDirectory`
      Parameters:
        `name` - the name of the file to create.
      Throws:
        `IOException` - in case of I/O error

    - #### createTempOutput

          public IndexOutput createTempOutput(String prefix,
                                              String suffix,
                                              IOContext context)
                                       throws IOException

      Description copied from class: `Directory`
      Creates a new, empty, temporary file in the directory and returns an `IndexOutput` instance for appending data to this file. The temporary file name (accessible via `IndexOutput.getName()`) will start with `prefix`, end with `suffix` and have a reserved file extension `.tmp`.
      Overrides:
        `createTempOutput` in class `FilterDirectory`
      Throws:
        `IOException`

    - #### copyFrom

          public void copyFrom(Directory from,
                               String src,
                               String dest,
                               IOContext context)
                        throws IOException

      Description copied from class: `Directory`
      Copies an existing `src` file from directory `from` to a non-existent file `dest` in this directory.
      Overrides:
        `copyFrom` in class `Directory`
      Throws:
        `IOException`

    - #### rename

          public void rename(String source,
                             String dest)
                      throws IOException

      Description copied from class: `Directory`
      Renames `source` file to `dest` file where `dest` must not already exist in the directory. It is permitted for this operation to not be truly atomic, for example both `source` and `dest` can be visible temporarily in `Directory.listAll()`. However, the implementation of this method must ensure the content of `dest` appears as the entire `source` atomically. So once `dest` is visible for readers, the entire content of previous `source` is visible. This method is used by IndexWriter to publish commits.
      Overrides:
        `rename` in class `FilterDirectory`
      Throws:
        `IOException`

    - #### getCreatedFiles

          public Set<String> getCreatedFiles()

      NOTE: returns a copy of the created files.

    - #### clearCreatedFiles

          public void clearCreatedFiles()

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