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## org.apache.lucene.index
Class CompoundFileWriter

    java.lang.Object
      org.apache.lucene.index.CompoundFileWriter

    public final class CompoundFileWriter

extends Object

Combines multiple files into a single compound file. The file format:

- VInt fileCount
- {Directory} fileCount entries with the following structure:

- long dataOffset
- String fileName

- {File Data} fileCount entries with the raw data of the corresponding file

The fileCount integer indicates how many files are contained in this compound file. The {directory} that follows has that many entries. Each directory entry contains a long pointer to the start of this file's data section, and a String with that file's name.

NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.

Constructor Summary
`CompoundFileWriter(Directory dir, String name)` Create the compound stream in the specified file.

Method Summary
`void` | `addFile(String file)` Add a source stream.
`void` | `addFile(String file, Directory dir)` Same as `addFile(String)`, only for files that are found in an external `Directory`.
`void` | `close()` Merge files with the extensions added up to now.
`Directory` | `getDirectory()` Returns the directory of the compound file.
`String` | `getName()` Returns the name of the compound file.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### CompoundFileWriter

    public CompoundFileWriter(Directory dir,
                              String name)

  Create the compound stream in the specified file. The file name is the entire name (no extensions are added).

  Throws:
    `NullPointerException` - if `dir` or `name` is null

Method Detail

### getDirectory

    public Directory getDirectory()

  Returns the directory of the compound file.

### getName

    public String getName()

  Returns the name of the compound file.

### addFile

    public void addFile(String file)

  Add a source stream. `file` is the string by which the sub-stream will be known in the compound stream.

  Throws:
    `IllegalStateException` - if this writer is closed
    `NullPointerException` - if `file` is null
    `IllegalArgumentException` - if a file with the same name has been added already

### addFile

    public void addFile(String file,
                        Directory dir)

  Same as `addFile(String)`, only for files that are found in an external `Directory`.

### close

    public void close()
               throws IOException

  Merge files with the extensions added up to now. All files with these extensions are combined sequentially into the compound stream.

  Throws:
    `IllegalStateException` - if close() had been called before or if no file has been added to this object
    `IOException`

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