return dir;
    }

    @Override
    public Collection<File> getReservedCacheFiles() {
        return Arrays.asList(propertiesFile, gcFile, determineLockTargetFile(getLockTarget()));
    }

    static File determineLockTargetFile(File target) {
        return new File(target, target.getName() + ".lock");
    }

    @Override
    public String toString() {
        return getDisplayName();

        } catch (Throwable t) {
            lockedFiles.remove(canonicalTarget);
            throw throwAsUncheckedException(t);
        }
    }

    static File determineLockTargetFile(File target) {
        if (target.isDirectory()) {
            return new File(target, target.getName() + ".lock");
        } else {
            return new File(target.getParentFile(), target.getName() + ".lock");