SenseNet.ContentRepository.Storage.Security.PermissionEvaluator.GetSubtreePermission C# (CSharp) Method

        internal PermissionValue GetSubtreePermission(string path, IUser user, bool isCreator, bool isLastModifier, PermissionType[] permissionTypes)
        {
            if (user.Id == -1)
                return PermissionValue.Allow;

            //======== #1: startbits: getpermbits
            //==>
            var principals = GetPrincipals(user, isCreator, isLastModifier);

            var allow = 0;
            var deny = 0;

            var firstPermInfo = GetFirstInfo(path);
            if (firstPermInfo.Path == path)
                firstPermInfo.AggregateLevelOnlyValues(principals, ref allow, ref deny);
            for (var permInfo = firstPermInfo; permInfo != null; permInfo = permInfo.Inherits ? permInfo.Parent : null)
                permInfo.AggregateEffectiveValues(principals, ref allow, ref deny);
            //==<
            var mask = GetPermissionMask(permissionTypes);
            if ((deny & mask) != 0)
                return PermissionValue.Deny;
            if ((allow & mask) != mask)
                return PermissionValue.NonDefined;

            //  +r     +1+++ | +1_++ | +1+++
            //  +r/a   +1_++ | +1+++ | +1-++
            // ==============|=======|=======
            //           +++ |   _++ |   -++

            //  +r     +1+++ | +1_++ | +1+++
            //  +r/a   -1_++ | -1+++ | -1-++
            // ==============|=======|=======
            //           +++ |   _++ |   -++

            //  +r     +1+++ | +1_++ | +1+++
            //  -r/a   +1_++ | +1+++ | +1-++
            // ==============|=======|=======
            //           _++ |   _++ |   -++
            // nem fugg a permissionset.inheritable ertektol
            // denybits: or, break: nem kell ujraszamolni
            // allowbits or, break: ujraszamolni

            //PermissionInfo subTreePermInfo;
            //if (entries.TryGetValue(path, out subTreePermInfo))
            //{
            //    subTreePermInfo.GetSubtreePermission(path, principals, isCreator, isLastModifier, mask, ref allow, ref deny);
            //}
            //else
            //{
            var p = path + "/";
            var permInfos = from key in permissionTable.Keys where key.StartsWith(p) orderby key select permissionTable[key];
            foreach (var permInfo in permInfos)
            {
                if (!permInfo.Inherits)
                {
                    allow = 0;
                    foreach (var entry in permInfo.PermissionSets)
                    {
                        if (!principals.Contains(entry.PrincipalId))
                            continue;
                        allow |= entry.AllowBits;
                        deny |= entry.DenyBits;
                    }
                }
                foreach (var entry in permInfo.PermissionSets)
                {
                    if (!principals.Contains(entry.PrincipalId))
                        continue;
                    deny |= entry.DenyBits;
                }
            }
            //}

            if ((deny & mask) != 0)
                return PermissionValue.Deny;
            if ((allow & mask) != mask)
                return PermissionValue.NonDefined;
            return PermissionValue.Allow;

        }
        internal PermissionValue[] GetAllPermissions(string path, IUser user, bool isCreator, bool isLastModifier)