/// <exception cref="System.IO.IOException"></exception>
public override Ref Peel(Ref @ref)
{
Ref leaf = @ref.GetLeaf();
if (leaf.IsPeeled() || leaf.GetObjectId() == null)
{
return(@ref);
}
ObjectIdRef newLeaf = DoPeel(leaf);
// Try to remember this peeling in the cache, so we don't have to do
// it again in the future, but only if the reference is unchanged.
if (leaf.GetStorage().IsLoose())
{
RefList <RefDirectory.LooseRef> curList = looseRefs.Get();
int idx = curList.Find(leaf.GetName());
if (0 <= idx && curList.Get(idx) == leaf)
{
RefDirectory.LooseRef asPeeled = ((RefDirectory.LooseRef)leaf).Peel(newLeaf);
RefList <RefDirectory.LooseRef> newList = curList.Set(idx, asPeeled);
looseRefs.CompareAndSet(curList, newList);
}
}
return(Recreate(@ref, newLeaf));
}
/// <exception cref="System.IO.IOException"></exception>
public override bool IsNameConflicting(string name)
{
RefList <Ref> packed = GetPackedRefs();
RefList <RefDirectory.LooseRef> loose = GetLooseRefs();
// Cannot be nested within an existing reference.
int lastSlash = name.LastIndexOf('/');
while (0 < lastSlash)
{
string needle = Sharpen.Runtime.Substring(name, 0, lastSlash);
if (loose.Contains(needle) || packed.Contains(needle))
{
return(true);
}
lastSlash = name.LastIndexOf('/', lastSlash - 1);
}
// Cannot be the container of an existing reference.
string prefix = name + '/';
int idx;
idx = -(packed.Find(prefix) + 1);
if (idx < packed.Size() && packed.Get(idx).GetName().StartsWith(prefix))
{
return(true);
}
idx = -(loose.Find(prefix) + 1);
if (idx < loose.Size() && loose.Get(idx).GetName().StartsWith(prefix))
{
return(true);
}
return(false);
}
/// <exception cref="System.IO.IOException"></exception>
private Ref Resolve(Ref @ref, int depth, string prefix, RefList <RefDirectory.LooseRef
> loose, RefList <Ref> packed)
{
if (@ref.IsSymbolic())
{
Ref dst = @ref.GetTarget();
if (MAX_SYMBOLIC_REF_DEPTH <= depth)
{
return(null);
}
// claim it doesn't exist
// If the cached value can be assumed to be current due to a
// recent scan of the loose directory, use it.
if (loose != null && dst.GetName().StartsWith(prefix))
{
int idx;
if (0 <= (idx = loose.Find(dst.GetName())))
{
dst = loose.Get(idx);
}
else
{
if (0 <= (idx = packed.Find(dst.GetName())))
{
dst = packed.Get(idx);
}
else
{
return(@ref);
}
}
}
else
{
dst = ReadRef(dst.GetName(), packed);
if (dst == null)
{
return(@ref);
}
}
dst = Resolve(dst, depth + 1, prefix, loose, packed);
if (dst == null)
{
return(null);
}
return(new SymbolicRef(@ref.GetName(), dst));
}
return(@ref);
}
/// <exception cref="System.IO.IOException"></exception>
private Ref ReadRef(string name, RefList <Ref> packed)
{
RefList <RefDirectory.LooseRef> curList = looseRefs.Get();
int idx = curList.Find(name);
if (0 <= idx)
{
RefDirectory.LooseRef o = curList.Get(idx);
RefDirectory.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);
}
RefDirectory.LooseRef n_1 = ScanRef(null, name);
if (n_1 == 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_1);
}
}
if (looseRefs.CompareAndSet(curList, curList.Add(idx, n_1)))
{
modCnt.IncrementAndGet();
}
return(n_1);
}
