boolean changedBetweenSnapshots(INodeFile file, Snapshot from, Snapshot to) {
int[] diffIndexPair = diffs.changedBetweenSnapshots(from, to);
if (diffIndexPair == null) {
return false;
}
int earlierDiffIndex = diffIndexPair[0];
int laterDiffIndex = diffIndexPair[1];
final List<FileDiff> diffList = diffs.asList();
final long earlierLength = diffList.get(earlierDiffIndex).getFileSize();
final long laterLength =
laterDiffIndex == diffList.size()
? file.computeFileSize(true, false)
: diffList.get(laterDiffIndex).getFileSize();
if (earlierLength != laterLength) { // file length has been changed
return true;
}
INodeFileAttributes earlierAttr = null; // check the metadata
for (int i = earlierDiffIndex; i < laterDiffIndex; i++) {
FileDiff diff = diffList.get(i);
if (diff.snapshotINode != null) {
earlierAttr = diff.snapshotINode;
break;
}
}
if (earlierAttr == null) { // no meta-change at all, return false
return false;
}
INodeFileAttributes laterAttr =
diffs.getSnapshotINode(
Math.max(Snapshot.getSnapshotId(from), Snapshot.getSnapshotId(to)), file);
return !earlierAttr.metadataEquals(laterAttr);
}
