org.apache.lucene.index

## Class SegmentCommitInfo

- java.lang.Object
- - org.apache.lucene.index.SegmentCommitInfo

-     public class SegmentCommitInfo
      extends Object

  Embeds a [read-only] SegmentInfo and adds per-commit fields.
  WARNING: This API is experimental and might change in incompatible ways in the next release.

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `SegmentInfo` | `info` The `SegmentInfo` that we wrap.

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `SegmentCommitInfo(SegmentInfo info, int delCount, long delGen, long fieldInfosGen, long docValuesGen)` Sole constructor.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `SegmentCommitInfo` | `clone()`
    `Collection<String>` | `files()` Returns all files in use by this segment.
    `int` | `getDelCount()` Returns the number of deleted docs in the segment.
    `long` | `getDelGen()` Returns generation number of the live docs file or -1 if there are no deletes yet.
    `long` | `getDocValuesGen()` Returns the generation number of the DocValues file or -1 if there are no doc-values updates yet.
    `Map<Integer,Set<String>>` | `getDocValuesUpdatesFiles()` Returns the per-field DocValues updates files.
    `Set<String>` | `getFieldInfosFiles()` Returns the FieldInfos file names.
    `long` | `getFieldInfosGen()` Returns the generation number of the field infos file or -1 if there are no field updates yet.
    `long` | `getNextDelGen()` Returns the next available generation number of the live docs file.
    `long` | `getNextDocValuesGen()` Returns the next available generation number of the DocValues files.
    `long` | `getNextFieldInfosGen()` Returns the next available generation number of the FieldInfos files.
    `boolean` | `hasDeletions()` Returns true if there are any deletions for the segment at this commit.
    `boolean` | `hasFieldUpdates()` Returns true if there are any field updates for the segment in this commit.
    `void` | `setDocValuesUpdatesFiles(Map<Integer,Set<String>> dvUpdatesFiles)` Sets the DocValues updates file names, per field number.
    `void` | `setFieldInfosFiles(Set<String> fieldInfosFiles)` Sets the FieldInfos file names.
    `long` | `sizeInBytes()` Returns total size in bytes of all files for this segment.
    `String` | `toString()`
    `String` | `toString(int pendingDelCount)` Returns a description of this segment.

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

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

- - ### Field Detail

    - #### info

          public final SegmentInfo info

      The `SegmentInfo` that we wrap.

  - ### Constructor Detail

    - #### SegmentCommitInfo

          public SegmentCommitInfo(SegmentInfo info,
                                   int delCount,
                                   long delGen,
                                   long fieldInfosGen,
                                   long docValuesGen)

      Sole constructor.
      Parameters:
        `info` - `SegmentInfo` that we wrap
        `delCount` - number of deleted documents in this segment
        `delGen` - deletion generation number (used to name deletion files)
        `fieldInfosGen` - FieldInfos generation number (used to name field-infos files)
        `docValuesGen` - DocValues generation number (used to name doc-values updates files)

  - ### Method Detail

    - #### getDocValuesUpdatesFiles

          public Map<Integer,Set<String>> getDocValuesUpdatesFiles()

      Returns the per-field DocValues updates files.

    - #### setDocValuesUpdatesFiles

          public void setDocValuesUpdatesFiles(Map<Integer,Set<String>> dvUpdatesFiles)

      Sets the DocValues updates file names, per field number. Does not deep clone the map.

    - #### getFieldInfosFiles

          public Set<String> getFieldInfosFiles()

      Returns the FieldInfos file names.

    - #### setFieldInfosFiles

          public void setFieldInfosFiles(Set<String> fieldInfosFiles)

      Sets the FieldInfos file names.

    - #### sizeInBytes

          public long sizeInBytes()
                           throws IOException

      Returns total size in bytes of all files for this segment.
      Throws:
        `IOException`

    - #### files

          public Collection<String> files()
                                   throws IOException

      Returns all files in use by this segment.
      Throws:
        `IOException`

    - #### hasDeletions

          public boolean hasDeletions()

      Returns true if there are any deletions for the segment at this commit.

    - #### hasFieldUpdates

          public boolean hasFieldUpdates()

      Returns true if there are any field updates for the segment in this commit.

    - #### getNextFieldInfosGen

          public long getNextFieldInfosGen()

      Returns the next available generation number of the FieldInfos files.

    - #### getFieldInfosGen

          public long getFieldInfosGen()

      Returns the generation number of the field infos file or -1 if there are no field updates yet.

    - #### getNextDocValuesGen

          public long getNextDocValuesGen()

      Returns the next available generation number of the DocValues files.

    - #### getDocValuesGen

          public long getDocValuesGen()

      Returns the generation number of the DocValues file or -1 if there are no doc-values updates yet.

    - #### getNextDelGen

          public long getNextDelGen()

      Returns the next available generation number of the live docs file.

    - #### getDelGen

          public long getDelGen()

      Returns generation number of the live docs file or -1 if there are no deletes yet.

    - #### getDelCount

          public int getDelCount()

      Returns the number of deleted docs in the segment.

    - #### toString

          public String toString(int pendingDelCount)

      Returns a description of this segment.

    - #### toString

          public String toString()

      Overrides:
        `toString` in class `Object`

    - #### clone

          public SegmentCommitInfo clone()

      Overrides:
        `clone` in class `Object`

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