// private stuff
// =============================================================================================
private static SyncPatch recurSync(MetaFile first, MetaFile second, String hashFunc)
throws SynchronizationException, IOException {
if (first.isFile()) {
if (first.getSize() == second.getSize()) {
InputStream fis = first.getInputStream();
InputStream sis = second.getInputStream();
if (hashFunc == null) {
if (FileUtils.isEqual(fis, sis)) {
return null;
}
} else {
byte[] hash1 = first.getHash(hashFunc);
byte[] hash2 = second.getHash(hashFunc);
if ((hash1 == null) && (hash2 == null)
|| ((hash1 == null) || (hash2 == null))
&& (HashManager.getHashManager().getCalculator(hashFunc) == null)) {
if (FileUtils.isEqual(fis, sis)) {
return null;
}
}
if (hash1 == null) {
hash1 = HashManager.getHashManager().getCalculator(hashFunc).calculate(fis);
}
if (hash2 == null) {
hash2 = HashManager.getHashManager().getCalculator(hashFunc).calculate(sis);
}
if (Arrays.equals(hash1, hash2)) {
return null;
}
}
}
if (first.getTime() > second.getTime()) {
return new SyncPatch(first, second.getName());
} else if (first.getTime() < second.getTime()) {
return new SyncPatch(second, first.getName());
} else {
throw new SynchronizationException("The same time for conflicted files");
}
} else { // directories
Set<SyncPatch> syncs = new HashSet<>();
boolean same = true;
Set<String> remained = new HashSet<>(second.getFiles().keySet());
for (String name : first.getFiles().keySet()) {
if (remained.remove(name)) { // if file exist in second directory
MetaFile fc = first.getFiles().get(name);
MetaFile sc = second.getFiles().get(name);
// if the one is file and the other is directory
if (fc.isFile() && !sc.isFile() || !fc.isFile() && sc.isFile()) {
same = false;
syncs.add(new SyncPatch(getMaster(fc, sc), null));
} else { // both files or directories exist
SyncPatch si = recurSync(fc, sc, hashFunc);
if (si != null) {
syncs.add(si);
}
}
} else { // file exist only in first directory
same = false;
syncs.add(diffSync(first, second, first.getFiles().get(name)));
}
}
if (!remained.isEmpty()) {
same = false;
for (String name : remained) {
syncs.add(diffSync(second, first, second.getFiles().get(name)));
}
}
if (same) {
if (syncs.isEmpty()) {
return null;
} else {
return new SyncPatch(first, second.getName(), syncs);
}
} else {
if (first.getTime() >= second.getTime()) {
return new SyncPatch(first, second.getName(), syncs);
} else {
return new SyncPatch(second, first.getName(), syncs);
}
}
}
}
