private Ref readRef(String name, RefList<Ref> packed) throws IOException {
final RefList<LooseRef> curList = looseRefs.get();
final int idx = curList.find(name);
if (0 <= idx) {
final LooseRef o = curList.get(idx);
final LooseRef n = scanRef(o, name);
if (n == null) {
if (looseRefs.compareAndSet(curList, curList.remove(idx))) modCnt.incrementAndGet();
return packed.get(name);
}
if (o == n) return n;
if (looseRefs.compareAndSet(curList, curList.set(idx, n))) modCnt.incrementAndGet();
return n;
}
final LooseRef n = scanRef(null, name);
if (n == null) return packed.get(name);
// check whether the found new ref is the an additional ref. These refs
// should not go into looseRefs
for (int i = 0; i < additionalRefsNames.length; i++)
if (name.equals(additionalRefsNames[i])) return n;
if (looseRefs.compareAndSet(curList, curList.add(idx, n))) modCnt.incrementAndGet();
return n;
}
/**
* Adds a set of refs to the set of packed-refs. Only non-symbolic refs are added. If a ref with
* the given name already existed in packed-refs it is updated with the new value. Each loose ref
* which was added to the packed-ref file is deleted. If a given ref can't be locked it will not
* be added to the pack file.
*
* @param refs the refs to be added. Must be fully qualified.
* @throws IOException
*/
public void pack(List<String> refs) throws IOException {
if (refs.size() == 0) return;
FS fs = parent.getFS();
// Lock the packed refs file and read the content
LockFile lck = new LockFile(packedRefsFile);
if (!lck.lock())
throw new IOException(MessageFormat.format(JGitText.get().cannotLock, packedRefsFile));
try {
final PackedRefList packed = getPackedRefs();
RefList<Ref> cur = readPackedRefs();
// Iterate over all refs to be packed
for (String refName : refs) {
Ref ref = readRef(refName, cur);
if (ref.isSymbolic()) continue; // can't pack symbolic refs
// Add/Update it to packed-refs
int idx = cur.find(refName);
if (idx >= 0) cur = cur.set(idx, peeledPackedRef(ref));
else cur = cur.add(idx, peeledPackedRef(ref));
}
// The new content for packed-refs is collected. Persist it.
commitPackedRefs(lck, cur, packed);
// Now delete the loose refs which are now packed
for (String refName : refs) {
// Lock the loose ref
File refFile = fileFor(refName);
if (!fs.exists(refFile)) continue;
LockFile rLck = new LockFile(refFile);
if (!rLck.lock()) continue;
try {
LooseRef currentLooseRef = scanRef(null, refName);
if (currentLooseRef == null || currentLooseRef.isSymbolic()) continue;
Ref packedRef = cur.get(refName);
ObjectId clr_oid = currentLooseRef.getObjectId();
if (clr_oid != null && clr_oid.equals(packedRef.getObjectId())) {
RefList<LooseRef> curLoose, newLoose;
do {
curLoose = looseRefs.get();
int idx = curLoose.find(refName);
if (idx < 0) break;
newLoose = curLoose.remove(idx);
} while (!looseRefs.compareAndSet(curLoose, newLoose));
int levels = levelsIn(refName) - 2;
delete(refFile, levels, rLck);
}
} finally {
rLck.unlock();
}
}
// Don't fire refsChanged. The refs have not change, only their
// storage.
} finally {
lck.unlock();
}
}