org.apache.hadoop.contrib.index.lucene
Class LuceneUtil

java.lang.Object
  org.apache.hadoop.contrib.index.lucene.LuceneUtil

public final class LuceneUtil
extends Object

This class copies some methods from Lucene's SegmentInfos since that class is not public.

Constructor Summary

LuceneUtil()

Method Summary

static long	generationFromSegmentsFileName(String fileName) Parse the generation off the segments file name and return it.
static long	getCurrentSegmentGeneration(org.apache.lucene.store.Directory directory) Get the generation (N) of the current segments_N file in the directory.
static long	getCurrentSegmentGeneration(String[] files) Get the generation (N) of the current segments_N file from a list of files.
static boolean	isSegmentsFile(String name) Check if the file is a segments_N file
static boolean	isSegmentsGenFile(String name) Check if the file is the segments.gen file

Methods inherited from class java.lang.Object

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

Constructor Detail

LuceneUtil

public LuceneUtil()

Method Detail

isSegmentsFile

public static boolean isSegmentsFile(String name)

Check if the file is a segments_N file

Parameters:

name -

Returns:

true if the file is a segments_N file

isSegmentsGenFile

public static boolean isSegmentsGenFile(String name)

Check if the file is the segments.gen file

Parameters:

name -

Returns:

true if the file is the segments.gen file

getCurrentSegmentGeneration

public static long getCurrentSegmentGeneration(org.apache.lucene.store.Directory directory)
                                        throws IOException

Get the generation (N) of the current segments_N file in the directory.

Parameters:

directory - -- directory to search for the latest segments_N file

Throws:

IOException

getCurrentSegmentGeneration

public static long getCurrentSegmentGeneration(String[] files)

Get the generation (N) of the current segments_N file from a list of files.

Parameters:

files - -- array of file names to check

generationFromSegmentsFileName

public static long generationFromSegmentsFileName(String fileName)

Parse the generation off the segments file name and return it.