org.apache.lucene.store

## Class HardlinkCopyDirectoryWrapper

- java.lang.Object
- - org.apache.lucene.store.Directory
  - - org.apache.lucene.store.FilterDirectory
    - - org.apache.lucene.store.HardlinkCopyDirectoryWrapper

- All Implemented Interfaces:
    Closeable, AutoCloseable

      public final class HardlinkCopyDirectoryWrapper
      extends FilterDirectory

  This directory wrapper overrides `Directory.copyFrom(Directory, String, String, IOContext)` in order to optionally use a hard-link instead of a full byte by byte file copy if applicable. Hard-links are only used if the underlying filesystem supports it and if the `LinkPermission` "hard" is granted.

  NOTE: Using hard-links changes the copy semantics of `Directory.copyFrom(Directory, String, String, IOContext)`. When hard-links are used changes to the source file will be reflected in the target file and vice-versa. Within Lucene, files are write once and should not be modified after they have been written. This directory should not be used in situations where files change after they have been written.

- - ### Field Summary

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

      `in`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `HardlinkCopyDirectoryWrapper(Directory in)` Creates a new HardlinkCopyDirectoryWrapper delegating to the given directory

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `copyFrom(Directory from, String srcFile, String destFile, IOContext context)`

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

      `close, createOutput, createTempOutput, deleteFile, fileLength, getDelegate, getPendingDeletions, listAll, obtainLock, openInput, rename, 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

    - #### HardlinkCopyDirectoryWrapper

          public HardlinkCopyDirectoryWrapper(Directory in)

      Creates a new HardlinkCopyDirectoryWrapper delegating to the given directory

  - ### Method Detail

    - #### copyFrom

          public void copyFrom(Directory from,
                               String srcFile,
                               String destFile,
                               IOContext context)
                        throws IOException

      Overrides:
        `copyFrom` in class `Directory`
      Throws:
        `IOException`

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