/**
* Recursively compute the difference between snapshots under a given directory/file.
*
* @param node The directory/file under which the diff is computed.
* @param parentPath Relative path (corresponding to the snapshot root) of the node's parent.
* @param diffReport data structure used to store the diff.
*/
private void computeDiffRecursively(
INode node, List<byte[]> parentPath, SnapshotDiffInfo diffReport) {
ChildrenDiff diff = new ChildrenDiff();
byte[][] relativePath = parentPath.toArray(new byte[parentPath.size()][]);
if (node.isDirectory()) {
INodeDirectory dir = node.asDirectory();
if (dir instanceof INodeDirectoryWithSnapshot) {
INodeDirectoryWithSnapshot sdir = (INodeDirectoryWithSnapshot) dir;
boolean change = sdir.computeDiffBetweenSnapshots(diffReport.from, diffReport.to, diff);
if (change) {
diffReport.addDirDiff(sdir, relativePath, diff);
}
}
ReadOnlyList<INode> children =
dir.getChildrenList(diffReport.isFromEarlier() ? diffReport.to : diffReport.from);
for (INode child : children) {
final byte[] name = child.getLocalNameBytes();
if (diff.searchIndex(ListType.CREATED, name) < 0
&& diff.searchIndex(ListType.DELETED, name) < 0) {
parentPath.add(name);
computeDiffRecursively(child, parentPath, diffReport);
parentPath.remove(parentPath.size() - 1);
}
}
} else if (node.isFile() && node.asFile() instanceof FileWithSnapshot) {
FileWithSnapshot file = (FileWithSnapshot) node.asFile();
Snapshot earlierSnapshot = diffReport.isFromEarlier() ? diffReport.from : diffReport.to;
Snapshot laterSnapshot = diffReport.isFromEarlier() ? diffReport.to : diffReport.from;
boolean change = file.getDiffs().changedBetweenSnapshots(earlierSnapshot, laterSnapshot);
if (change) {
diffReport.addFileDiff(file.asINodeFile(), relativePath);
}
}
}
@Override
public int compare(INode left, INode right) {
if (left == null) {
return right == null ? 0 : -1;
} else {
if (right == null) {
return 1;
} else {
int cmp = compare(left.getParent(), right.getParent());
return cmp == 0
? SignedBytes.lexicographicalComparator()
.compare(left.getLocalNameBytes(), right.getLocalNameBytes())
: cmp;
}
}
}
private void saveCreatedList(List<INode> created, OutputStream out) throws IOException {
// local names of the created list member
for (INode c : created) {
SnapshotDiffSection.CreatedListEntry.newBuilder()
.setName(ByteString.copyFrom(c.getLocalNameBytes()))
.build()
.writeDelimitedTo(out);
}
}
