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maintain most recent file format in a single line in the code. 

(this is less bug prone.)


git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@518529 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Doron Cohen 2007-03-15 09:08:07 +00:00
parent cb88961792
commit a6d56d5eb9
1 changed files with 8 additions and 6 deletions
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14
src/java/org/apache/lucene/index/SegmentInfos.java
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@ -29,6 +29,7 @@ import java.util.Vector;
final class SegmentInfos extends Vector {
/** The file format version, a negative number. */
/* Works since counter, the old 1st entry, is always >= 0 */
public static final int FORMAT = -1;
@ -44,13 +45,15 @@ final class SegmentInfos extends Vector {
*/
public static final int FORMAT_LOCKLESS = -2;
/** This is the current file format written. It adds a
* "hasSingleNormFile" flag into each segment info.
/** This format adds a "hasSingleNormFile" flag into each segment info.
* See <a href="http://issues.apache.org/jira/browse/LUCENE-756">LUCENE-756</a>
* for details.
*/
public static final int FORMAT_SINGLE_NORM_FILE = -3;
/* This must always point to the most recent file format. */
private static final int CURRENT_FORMAT = FORMAT_SINGLE_NORM_FILE;
public int counter = 0; // used to name new segments
/**
* counts how often the index has been changed by adding or deleting docs.
@ -84,7 +87,6 @@ final class SegmentInfos extends Vector {
return -1;
}
long max = -1;
int prefixLen = IndexFileNames.SEGMENTS.length()+1;
for (int i = 0; i < files.length; i++) {
String file = files[i];
if (file.startsWith(IndexFileNames.SEGMENTS) && !file.equals(IndexFileNames.SEGMENTS_GEN)) {
@ -198,7 +200,7 @@ final class SegmentInfos extends Vector {
int format = input.readInt();
if(format < 0){ // file contains explicit format info
// check that it is a format we can understand
if (format < FORMAT_SINGLE_NORM_FILE)
if (format < CURRENT_FORMAT)
throw new CorruptIndexException("Unknown format version: " + format);
version = input.readLong(); // read version
counter = input.readInt(); // read counter
@ -263,7 +265,7 @@ final class SegmentInfos extends Vector {
boolean success = false;
try {
output.writeInt(FORMAT_SINGLE_NORM_FILE); // write FORMAT
output.writeInt(CURRENT_FORMAT); // write FORMAT
output.writeLong(++version); // every write changes
// the index
output.writeInt(counter); // write counter
@ -343,7 +345,7 @@ final class SegmentInfos extends Vector {
try {
format = input.readInt();
if(format < 0){
if (format < FORMAT_SINGLE_NORM_FILE)
if (format < CURRENT_FORMAT)
throw new CorruptIndexException("Unknown format version: " + format);
version = input.readLong(); // read version
}