}

    @Override
    public boolean isEmpty() {
        return getFiles().isEmpty();
    }

    @Override
    public FileTreeInternal getAsFileTree() {
        return new FileCollectionBackedFileTree(taskDependencyFactory, patternSetFactory, this);
    }

    @Override
    public FileCollection filter(Closure filterClosure) {
        return filter(Specs.convertClosureToSpec(filterClosure));
    }