Package org.apache.lucene.codecs

# Class SegmentInfoFormat

java.lang.Object
org.apache.lucene.codecs.SegmentInfoFormat

Direct Known Subclasses:
  `Lucene99SegmentInfoFormat`

public abstract class SegmentInfoFormat extends Object
Expert: Controls the format of the `SegmentInfo` (segment metadata file).

See Also:
  - `SegmentInfo`
WARNING: This API is experimental and might change in incompatible ways in the next release.

- ## Constructor Summary

  Constructors
  Modifier
  Constructor
  Description
  `protected`
  `SegmentInfoFormat()`
  Sole constructor.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `abstract SegmentInfo`
  `read(Directory directory, String segmentName, byte[] segmentID, IOContext context)`
  Read `SegmentInfo` data from a directory.
  `abstract void`
  `write(Directory dir, SegmentInfo info, IOContext ioContext)`
  Write `SegmentInfo` data.

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

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

- ## Constructor Details

  - ### SegmentInfoFormat

    protected SegmentInfoFormat()
    Sole constructor. (For invocation by subclass constructors, typically implicit.)

- ## Method Details

  - ### read

    public abstract SegmentInfo read(Directory directory, String segmentName, byte[] segmentID, IOContext context) throws IOException
    Read `SegmentInfo` data from a directory.
    Parameters:
      `directory` - directory to read from
      `segmentName` - name of the segment to read
      `segmentID` - expected identifier for the segment
    Returns:
      infos instance to be populated with data
    Throws:
      `IOException` - If an I/O error occurs

  - ### write

    public abstract void write(Directory dir, SegmentInfo info, IOContext ioContext) throws IOException
    Write `SegmentInfo` data. The codec must add its SegmentInfo filename(s) to `info` before doing i/o.
    Throws:
      `IOException` - If an I/O error occurs