infos.version = input.readLong(); // read version
infos.counter = input.readInt(); // read counter
Lucene3xSegmentInfoReader reader = new Lucene3xSegmentInfoReader();
for (int i = input.readInt(); i > 0; i--) { // read segmentInfos
SegmentCommitInfo siPerCommit = reader.readLegacySegmentInfo(directory, format, input);
SegmentInfo si = siPerCommit.info;
if (si.getVersion() == null) {
// Could be a 3.0 - try to open the doc stores - if it fails, it's a
// 2.x segment, and an IndexFormatTooOldException will be thrown,
// which is what we want.
Directory dir = directory;
if (Lucene3xSegmentInfoFormat.getDocStoreOffset(si) != -1) {
if (Lucene3xSegmentInfoFormat.getDocStoreIsCompoundFile(si)) {
dir = new CompoundFileDirectory(dir, IndexFileNames.segmentFileName(
Lucene3xSegmentInfoFormat.getDocStoreSegment(si), "",
Lucene3xCodec.COMPOUND_FILE_STORE_EXTENSION), IOContext.READONCE, false);
}
} else if (si.getUseCompoundFile()) {
dir = new CompoundFileDirectory(dir, IndexFileNames.segmentFileName(
si.name, "", IndexFileNames.COMPOUND_FILE_EXTENSION), IOContext.READONCE, false);
}
try {
Lucene3xStoredFieldsReader.checkCodeVersion(dir, Lucene3xSegmentInfoFormat.getDocStoreSegment(si));
} finally {
// If we opened the directory, close it
if (dir != directory) dir.close();
}
// Above call succeeded, so it's a 3.0 segment. Upgrade it so the next
// time the segment is read, its version won't be null and we won't
// need to open FieldsReader every time for each such segment.
si.setVersion("3.0");
} else if (si.getVersion().equals("2.x")) {
// If it's a 3x index touched by 3.1+ code, then segments record their
// version, whether they are 2.x ones or not. We detect that and throw
// appropriate exception.
throw new IndexFormatTooOldException("segment " + si.name + " in resource " + input, si.getVersion());
}
infos.add(siPerCommit);
}
infos.userData = input.readStringStringMap();