@Override
public Map<String, Ref> getRefs(String prefix) throws IOException {
final RefList<LooseRef> oldLoose = looseRefs.get();
LooseScanner scan = new LooseScanner(oldLoose);
scan.scan(prefix);
final RefList<Ref> packed = getPackedRefs();
RefList<LooseRef> loose;
if (scan.newLoose != null) {
scan.newLoose.sort();
loose = scan.newLoose.toRefList();
if (looseRefs.compareAndSet(oldLoose, loose)) modCnt.incrementAndGet();
} else loose = oldLoose;
fireRefsChanged();
RefList.Builder<Ref> symbolic = scan.symbolic;
for (int idx = 0; idx < symbolic.size(); ) {
final Ref symbolicRef = symbolic.get(idx);
final Ref resolvedRef = resolve(symbolicRef, 0, prefix, loose, packed);
if (resolvedRef != null && resolvedRef.getObjectId() != null) {
symbolic.set(idx, resolvedRef);
idx++;
} else {
// A broken symbolic reference, we have to drop it from the
// collections the client is about to receive. Should be a
// rare occurrence so pay a copy penalty.
symbolic.remove(idx);
final int toRemove = loose.find(symbolicRef.getName());
if (0 <= toRemove) loose = loose.remove(toRemove);
}
}
symbolic.sort();
return new RefMap(prefix, packed, upcast(loose), symbolic.toRefList());
}
private RefList<Ref> parsePackedRefs(final BufferedReader br) throws IOException {
RefList.Builder<Ref> all = new RefList.Builder<Ref>();
Ref last = null;
boolean peeled = false;
boolean needSort = false;
String p;
while ((p = br.readLine()) != null) {
if (p.charAt(0) == '#') {
if (p.startsWith(PACKED_REFS_HEADER)) {
p = p.substring(PACKED_REFS_HEADER.length());
peeled = p.contains(PACKED_REFS_PEELED);
}
continue;
}
if (p.charAt(0) == '^') {
if (last == null) throw new IOException(JGitText.get().peeledLineBeforeRef);
ObjectId id = ObjectId.fromString(p.substring(1));
last = new ObjectIdRef.PeeledTag(PACKED, last.getName(), last.getObjectId(), id);
all.set(all.size() - 1, last);
continue;
}
int sp = p.indexOf(' ');
if (sp < 0) {
throw new IOException(
MessageFormat.format(
JGitText.get().packedRefsCorruptionDetected, packedRefsFile.getAbsolutePath()));
}
ObjectId id = ObjectId.fromString(p.substring(0, sp));
String name = copy(p, sp + 1, p.length());
ObjectIdRef cur;
if (peeled) cur = new ObjectIdRef.PeeledNonTag(PACKED, name, id);
else cur = new ObjectIdRef.Unpeeled(PACKED, name, id);
if (last != null && RefComparator.compareTo(last, cur) > 0) needSort = true;
all.add(cur);
last = cur;
}
if (needSort) all.sort();
return all.toRefList();
}