package?org.apache.lucene.index;

import?org.apache.lucene.codecs.Codec;
import?org.apache.lucene.codecs.CodecUtil;
import?org.apache.lucene.store.*;
import?org.apache.lucene.util.IOUtils;

import?java.io.File;
import?java.io.IOException;
import?java.util.*;

/**
?*?This?class?allows?us?to?peek?at?various?Lucene?internals?not?available
?*?through?public?APIs?（for?good?reasons?but?inquiring?minds?want?to?know?...）.
?*?
?*?@author?ab
?*
?*/
public?class?IndexGate?{
??static?HashMap?knownExtensions?=?new?HashMap（）;

??//?old?version?constants
??public?static?final?int?OLD_FORMAT?=?-1;

??/**?This?format?adds?details?used?for?lockless?commits.??It?differs
???*?slightly?from?the?previous?format?in?that?file?names
???*?are?never?re-used?（write?once）.??Instead?each?file?is
???*?written?to?the?next?generation.??For?example
???*?segments_1?segments_2?etc.??This?allows?us?to?not?use
???*?a?commit?lock.??See????*?href=“http://lucene.apache.org/java/docs/fileformats.html“>file
???*?formats?for?details.
???*/
??public?static?final?int?FORMAT_LOCKLESS?=?-2;

??/**?This?format?adds?a?“hasSingleNormFile“?flag?into?each?segment?info.
???*?See?LUCENE-756
???*?for?details.
???*/
??public?static?final?int?FORMAT_SINGLE_NORM_FILE?=?-3;

??/**?This?format?allows?multiple?segments?to?share?a?single
???*?vectors?and?stored?fields?file.?*/
??public?static?final?int?FORMAT_SHARED_DOC_STORE?=?-4;

??/**?This?format?adds?a?checksum?at?the?end?of?the?file?to
???*??ensure?all?bytes?were?successfully?written.?*/
??public?static?final?int?FORMAT_CHECKSUM?=?-5;

??/**?This?format?adds?the?deletion?count?for?each?segment.
???*??This?way?IndexWriter?can?efficiently?report?numDocs（）.?*/
??public?static?final?int?FORMAT_DEL_COUNT?=?-6;

??/**?This?format?adds?the?boolean?hasProx?to?record?if?any
???*??fields?in?the?segment?store?prox?information?（ie?have
???*??omitTermFreqAndPositions==false）?*/
??public?static?final?int?FORMAT_HAS_PROX?=?-7;

??/**?This?format?adds?optional?commit?userData?（String）?storage.?*/
??public?static?final?int?FORMAT_USER_DATA?=?-8;

??/**?This?format?adds?optional?per-segment?String
???*??diagnostics?storage?and?switches?userData?to?Map?*/
??public?static?final?int?FORMAT_DIAGNOSTICS?=?-9;

??/**?Each?segment?records?whether?it?has?term?vectors?*/
??public?static?final?int?FORMAT_HAS_VECTORS?=?-10;

??/**?Each?segment?records?the?Lucene?version?that?created?it.?*/
??public?static?final?int?FORMAT_3_1?=?-11;
??/**?Some?early?4.0?pre-alpha?*/
??public?static?final?int?FORMAT_PRE_4?=?-12;

??static?{
????knownExtensions.put（IndexFileNames.SEGMENTS?“per-commit?list?of?segments?and?user?data“）;
??}
??
??public?static?String?getFileFunction（String?file）?{
????if?（file?==?null?||?file.trim（）.length（）?==?0）?return?file;
????String?res?=?null;
????file?=?file.trim（）;
????int?idx?=?file.indexOf（‘.‘）;
????String?suffix?=?null;
????if?（idx?!=?-1）?{
??????suff

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2016-03-17?07:44??luke-pivot-luke-5.5.0\
?????文件??????????17??2016-03-17?07:44??luke-pivot-luke-5.5.0\.gitignore
?????文件???????18975??2016-03-17?07:44??luke-pivot-luke-5.5.0\CHANGES.txt
?????文件????????3214??2016-03-17?07:44??luke-pivot-luke-5.5.0\README.md
?????文件????????4184??2016-03-17?07:44??luke-pivot-luke-5.5.0\build.xml
?????目錄???????????0??2016-03-17?07:44??luke-pivot-luke-5.5.0\docs\
?????目錄???????????0??2016-03-17?07:44??luke-pivot-luke-5.5.0\docs\img\
?????文件????????6185??2016-03-17?07:44??luke-pivot-luke-5.5.0\docs\img\LukeExportIndex.png
?????文件????????5102??2016-03-17?07:44??luke-pivot-luke-5.5.0\docs\img\LukeTermVector.png
?????文件??????????58??2016-03-17?07:44??luke-pivot-luke-5.5.0\luke.bat
?????文件????????1512??2016-03-17?07:44??luke-pivot-luke-5.5.0\luke.gif
?????文件?????????774??2016-03-17?07:44??luke-pivot-luke-5.5.0\luke.sh
?????文件?????????905??2016-03-17?07:44??luke-pivot-luke-5.5.0\luke_solr.sh
?????文件???????11797??2016-03-17?07:44??luke-pivot-luke-5.5.0\pom.xml
?????目錄???????????0??2016-03-17?07:44??luke-pivot-luke-5.5.0\src\
?????目錄???????????0??2016-03-17?07:44??luke-pivot-luke-5.5.0\src\main\
?????目錄???????????0??2016-03-17?07:44??luke-pivot-luke-5.5.0\src\main\assembly\
?????文件?????????657??2016-03-17?07:44??luke-pivot-luke-5.5.0\src\main\assembly\assembly.xml
?????目錄???????????0??2016-03-17?07:44??luke-pivot-luke-5.5.0\src\main\java\
?????目錄???????????0??2016-03-17?07:44??luke-pivot-luke-5.5.0\src\main\java\org\
?????目錄???????????0??2016-03-17?07:44??luke-pivot-luke-5.5.0\src\main\java\org\apache\
?????目錄???????????0??2016-03-17?07:44??luke-pivot-luke-5.5.0\src\main\java\org\apache\lucene\
?????目錄???????????0??2016-03-17?07:44??luke-pivot-luke-5.5.0\src\main\java\org\apache\lucene\index\
?????文件???????13071??2016-03-17?07:44??luke-pivot-luke-5.5.0\src\main\java\org\apache\lucene\index\IndexGate.java
?????目錄???????????0??2016-03-17?07:44??luke-pivot-luke-5.5.0\src\main\java\org\apache\lucene\luke\
?????目錄???????????0??2016-03-17?07:44??luke-pivot-luke-5.5.0\src\main\java\org\apache\lucene\luke\core\
?????文件?????????473??2016-03-17?07:44??luke-pivot-luke-5.5.0\src\main\java\org\apache\lucene\luke\core\AccessibleHitCollector.java
?????文件????????1286??2016-03-17?07:44??luke-pivot-luke-5.5.0\src\main\java\org\apache\lucene\luke\core\AccessibleTopHitCollector.java
?????文件????????2041??2016-03-17?07:44??luke-pivot-luke-5.5.0\src\main\java\org\apache\lucene\luke\core\AllHitsCollector.java
?????文件???????23283??2016-03-17?07:44??luke-pivot-luke-5.5.0\src\main\java\org\apache\lucene\luke\core\BrowserLauncher.java
?????文件???????18369??2016-03-17?07:44??luke-pivot-luke-5.5.0\src\main\java\org\apache\lucene\luke\core\ClassFinder.java
............此處省略193個文件信息