Package org.apache.lucene.index

Class SegmentMerger

java.lang.Object

org.apache.lucene.index.SegmentMerger

final class SegmentMerger
extends Object

The SegmentMerger class combines two or more Segments, represented by an IndexReader, into a single Segment. Call the merge method to combine the segments.

See Also:

• merge()

Field Summary

Fields

Modifier and Type	Field	Description
private final Codec	codec
private final IOContext	context
private final Directory	directory
private final FieldInfos.Builder	fieldInfosBuilder
(package private) final MergeState	mergeState

Constructor Summary

Constructors

Constructor	Description
SegmentMerger(List<CodecReader> readers, SegmentInfo segmentInfo, InfoStream infoStream, Directory dir, FieldInfos.FieldNumbers fieldNumbers, IOContext context)

Method Summary

Modifier and Type	Method	Description
(package private) MergeState	merge()	Merges the readers into the directory passed to the constructor
private void	mergeDocValues(SegmentWriteState segmentWriteState)
void	mergeFieldInfos()
private int	mergeFields()	Merge stored fields from each of the segments into the new one.
private void	mergeNorms(SegmentWriteState segmentWriteState)
private void	mergePoints(SegmentWriteState segmentWriteState)
private void	mergeTerms(SegmentWriteState segmentWriteState, NormsProducer norms)
private int	mergeVectors()	Merge the TermVectors from each of the segments into the new one.
(package private) boolean	shouldMerge()	True if any merging should happen

Methods inherited from class java.lang.Object

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

Field Details

directory

private final Directory directory

codec

private final Codec codec

context

private final IOContext context

mergeState

final MergeState mergeState

fieldInfosBuilder

private final FieldInfos.Builder fieldInfosBuilder

Constructor Details

SegmentMerger

SegmentMerger(List<CodecReader> readers,
 SegmentInfo segmentInfo,
 InfoStream infoStream,
 Directory dir,
 FieldInfos.FieldNumbers fieldNumbers,
 IOContext context)
       throws IOException

Throws:

IOException

Method Details

shouldMerge

boolean shouldMerge()

True if any merging should happen

merge

MergeState merge()
          throws IOException

Merges the readers into the directory passed to the constructor

Returns:

The number of documents that were merged

Throws:

CorruptIndexException - if the index is corrupt

IOException - if there is a low-level IO error

mergeDocValues

private void mergeDocValues(SegmentWriteState segmentWriteState)
                     throws IOException

Throws:

IOException

mergePoints

private void mergePoints(SegmentWriteState segmentWriteState)
                  throws IOException

Throws:

IOException

mergeNorms

private void mergeNorms(SegmentWriteState segmentWriteState)
                 throws IOException

Throws:

IOException

mergeFieldInfos

public void mergeFieldInfos()

mergeFields

private int mergeFields()
                 throws IOException

Merge stored fields from each of the segments into the new one.

Returns:

The number of documents in all of the readers

Throws:

CorruptIndexException - if the index is corrupt

IOException - if there is a low-level IO error

mergeVectors

private int mergeVectors()
                  throws IOException

Merge the TermVectors from each of the segments into the new one.

Throws:

IOException - if there is a low-level IO error

mergeTerms

private void mergeTerms(SegmentWriteState segmentWriteState,
 NormsProducer norms)
                 throws IOException

Throws:

IOException