/**
* prunes the list of index files such that only the latest del generation files are contained.
*/
private void pruneOldDeleteGenerations(Set<Path> files) {
final TreeSet<Path> delFiles = new TreeSet<>();
for (Path file : files) {
if (file.getFileName().toString().endsWith(".liv")) {
delFiles.add(file);
}
}
Path last = null;
for (Path current : delFiles) {
if (last != null) {
final String newSegmentName =
IndexFileNames.parseSegmentName(current.getFileName().toString());
final String oldSegmentName =
IndexFileNames.parseSegmentName(last.getFileName().toString());
if (newSegmentName.equals(oldSegmentName)) {
int oldGen =
Integer.parseInt(
IndexFileNames.stripExtension(
IndexFileNames.stripSegmentName(last.getFileName().toString()))
.replace("_", ""),
Character.MAX_RADIX);
int newGen =
Integer.parseInt(
IndexFileNames.stripExtension(
IndexFileNames.stripSegmentName(current.getFileName().toString()))
.replace("_", ""),
Character.MAX_RADIX);
if (newGen > oldGen) {
files.remove(last);
} else {
files.remove(current);
continue;
}
}
}
last = current;
}
}
