return SIGNATURE;
    }

    @Override
    public boolean isContentAndMetadataUpToDate(FileSystemLocationSnapshot other) {
        return isContentUpToDate(other);
    }

    @Override
    public boolean isContentUpToDate(FileSystemLocationSnapshot other) {
        return other instanceof MissingFileSnapshot;
    }

    @Override
    public void accept(FileSystemLocationSnapshotVisitor visitor) {

        return metadata;
    }

    @Override
    public boolean isContentAndMetadataUpToDate(FileSystemLocationSnapshot other) {
        return isContentUpToDate(other) && metadata.equals(((RegularFileSnapshot) other).metadata);
    }

    @Override
    public boolean isContentUpToDate(FileSystemLocationSnapshot other) {
        if (!(other instanceof RegularFileSnapshot)) {
            return false;
        }

        return FileType.Directory;
    }

    @Override
    public boolean isContentAndMetadataUpToDate(FileSystemLocationSnapshot other) {
        return isContentUpToDate(other);
    }

    @Override
    public boolean isContentUpToDate(FileSystemLocationSnapshot other) {
        return other instanceof DirectorySnapshot;
    }

    @Override

     */
    boolean isContentAndMetadataUpToDate(FileSystemLocationSnapshot other);

    /**
     * Whether the content of the current snapshot is the same as for the given one.
     */
    boolean isContentUpToDate(FileSystemLocationSnapshot other);

    /**
     * Whether the file system location represented by this snapshot is a symlink or not.
     */
    FileMetadata.AccessType getAccessType();

            // Created since last execution, possibly by another task
            if (previousSnapshot == null) {
                return true;
            }
            return !snapshot.isContentUpToDate(previousSnapshot);
        }

        @Nullable
        public String getOverlappingPath() {
            return overlappingPath;
        }
    }