private void verifyCommitOrder(List<? extends IndexCommit> commits) {
if (commits.isEmpty()) {
return;
}
final IndexCommit firstCommit = commits.get(0);
long last = SegmentInfos.generationFromSegmentsFileName(firstCommit.getSegmentsFileName());
assertEquals(last, firstCommit.getGeneration());
for (int i = 1; i < commits.size(); i++) {
final IndexCommit commit = commits.get(i);
long now = SegmentInfos.generationFromSegmentsFileName(commit.getSegmentsFileName());
assertTrue("SegmentInfos commits are out-of-order", now > last);
assertEquals(now, commit.getGeneration());
last = now;
}
}
/** @see org.apache.lucene.index.IndexReader#listCommits */
public static Collection<IndexCommit> listCommits(Directory dir) throws IOException {
final String[] files = dir.listAll();
List<IndexCommit> commits = new ArrayList<IndexCommit>();
SegmentInfos latest = new SegmentInfos();
latest.read(dir);
final long currentGen = latest.getGeneration();
commits.add(new ReaderCommit(latest, dir));
for (int i = 0; i < files.length; i++) {
final String fileName = files[i];
if (fileName.startsWith(IndexFileNames.SEGMENTS)
&& !fileName.equals(IndexFileNames.SEGMENTS_GEN)
&& SegmentInfos.generationFromSegmentsFileName(fileName) < currentGen) {
SegmentInfos sis = new SegmentInfos();
try {
// IOException allowed to throw there, in case
// segments_N is corrupt
sis.read(dir, fileName);
} catch (FileNotFoundException fnfe) {
// LUCENE-948: on NFS (and maybe others), if
// you have writers switching back and forth
// between machines, it's very likely that the
// dir listing will be stale and will claim a
// file segments_X exists when in fact it
// doesn't. So, we catch this and handle it
// as if the file does not exist
sis = null;
}
if (sis != null) commits.add(new ReaderCommit(sis, dir));
}
}
// Ensure that the commit points are sorted in ascending order.
Collections.sort(commits);
return commits;
}