Package org.apache.lucene.index

# Class SegmentInfos.FindSegmentsFile<T>

java.lang.Object
org.apache.lucene.index.SegmentInfos.FindSegmentsFile<T>

Enclosing class:
  `SegmentInfos`

public abstract static class SegmentInfos.FindSegmentsFile<T> extends Object
Utility class for executing code that needs to do something with the current segments file. This is necessary with lock-less commits because from the time you locate the current segments file name, until you actually open it, read its contents, or check modified time, etc., it could have been deleted due to a writer commit finishing.

## Constructor Summary

Constructors
Modifier
Constructor
Description
`protected`
`FindSegmentsFile(Directory directory)`
Sole constructor.

## Method Summary

Modifier and Type
Method
Description
`protected abstract T`
`doBody(String segmentFileName)`
Subclass must implement this.
`T`
`run()`
Locate the most recent `segments` file and run `doBody(java.lang.String)` on it.
`T`
`run(IndexCommit commit)`
Run `doBody(java.lang.String)` on the provided commit.

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

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

## Constructor Details

### FindSegmentsFile

protected FindSegmentsFile(Directory directory)
Sole constructor.

## Method Details

### run

public T run() throws IOException
Locate the most recent `segments` file and run `doBody(java.lang.String)` on it.

Throws:
  `IOException`

### run

public T run(IndexCommit commit) throws IOException
Run `doBody(java.lang.String)` on the provided commit.

Throws:
  `IOException`

### doBody

protected abstract T doBody(String segmentFileName) throws IOException
Subclass must implement this. The assumption is an IOException will be thrown if something goes wrong during the processing that could have been caused by a writer committing.

Throws:
  `IOException`