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## org.apache.lucene.index
Class MergePolicy.OneMerge

    java.lang.Object
      org.apache.lucene.index.MergePolicy.OneMerge

Enclosing class:
  MergePolicy

    public static class MergePolicy.OneMerge

extends Object

OneMerge provides the information necessary to perform an individual primitive merge operation, resulting in a single new segment. The merge spec includes the subset of segments to be merged as well as whether the new segment should use the compound file format.

Field Summary
`long` | `estimatedMergeBytes` Estimated size in bytes of the merged segment.
`List<SegmentInfoPerCommit>` | `segments` Segments to be merged.
`int` | `totalDocCount` Number of documents in the merged segment.

Constructor Summary
`MergePolicy.OneMerge(List<SegmentInfoPerCommit> segments)` Sole constructor.

Method Summary
`void` | `checkAborted(Directory dir)` Called periodically by `IndexWriter` while merging to see if the merge is aborted.
`MergePolicy.DocMap` | `getDocMap(MergeState mergeState)` Expert: If `getMergeReaders()` reorders document IDs, this method must be overridden to return a mapping from the natural doc ID (the doc ID that would result from a natural merge) to the actual doc ID.
`MergeInfo` | `getMergeInfo()` Return `MergeInfo` describing this merge.
`List<AtomicReader>` | `getMergeReaders()` Expert: Get the list of readers to merge.
`boolean` | `getPause()` Returns true if this merge is paused.
`String` | `segString(Directory dir)` Returns a readable description of the current merge state.
`void` | `setInfo(SegmentInfoPerCommit info)` Expert: Sets the `SegmentInfoPerCommit` of this `MergePolicy.OneMerge`.
`void` | `setPause(boolean paused)` Set or clear whether this merge is paused paused (for example `ConcurrentMergeScheduler` will pause merges if too many are running).
`long` | `totalBytesSize()` Returns the total size in bytes of this merge.
`int` | `totalNumDocs()` Returns the total number of documents that are included with this merge.

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

Field Detail

### estimatedMergeBytes

    public volatile long estimatedMergeBytes

  Estimated size in bytes of the merged segment.

### segments

    public final List<SegmentInfoPerCommit> segments

  Segments to be merged.

### totalDocCount

    public final int totalDocCount

  Number of documents in the merged segment.

Constructor Detail

### MergePolicy.OneMerge

    public MergePolicy.OneMerge(List<SegmentInfoPerCommit> segments)

  Sole constructor.

  Parameters:
    `segments` - List of `SegmentInfoPerCommit`s to be merged.

Method Detail

### getMergeReaders

    public List<AtomicReader> getMergeReaders()
                                       throws IOException

  Expert: Get the list of readers to merge. Note that this list does not necessarily match the list of segments to merge and should only be used to feed SegmentMerger to initialize a merge. When a `MergePolicy.OneMerge` reorders doc IDs, it must override `getDocMap(org.apache.lucene.index.MergeState)` too so that deletes that happened during the merge can be applied to the newly merged segment.

  Throws:
    `IOException`

### setInfo

    public void setInfo(SegmentInfoPerCommit info)

  Expert: Sets the `SegmentInfoPerCommit` of this `MergePolicy.OneMerge`. Allows sub-classes to e.g. set diagnostics properties.

### getDocMap

    public MergePolicy.DocMap getDocMap(MergeState mergeState)

  Expert: If `getMergeReaders()` reorders document IDs, this method must be overridden to return a mapping from the natural doc ID (the doc ID that would result from a natural merge) to the actual doc ID. This mapping is used to apply deletions that happened during the merge to the new segment.

### checkAborted

    public void checkAborted(Directory dir)
                      throws MergePolicy.MergeAbortedException

  Called periodically by `IndexWriter` while merging to see if the merge is aborted.

  Throws:
    `MergePolicy.MergeAbortedException`

### setPause

    public void setPause(boolean paused)

  Set or clear whether this merge is paused paused (for example `ConcurrentMergeScheduler` will pause merges if too many are running).

### getPause

    public boolean getPause()

  Returns true if this merge is paused.

  See Also:
    `setPause(boolean)`

### segString

    public String segString(Directory dir)

  Returns a readable description of the current merge state.

### totalBytesSize

    public long totalBytesSize()
                        throws IOException

  Returns the total size in bytes of this merge. Note that this does not indicate the size of the merged segment, but the input total size. This is only set once the merge is initialized by IndexWriter.

  Throws:
    `IOException`

### totalNumDocs

    public int totalNumDocs()
                     throws IOException

  Returns the total number of documents that are included with this merge. Note that this does not indicate the number of documents after the merge.

  Throws:
    `IOException`

### getMergeInfo

    public MergeInfo getMergeInfo()

  Return `MergeInfo` describing this merge.

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