public DirectoryFileTree postfix() {
        if (postfix) {
            return this;
        }
        return new DirectoryFileTree(dir, patternSet, fileSystem, true);
    }

    public PatternSet getPatternSet() {
        return patternSet;
    }

            return RelativePath.parse(false, parentPath, path);
        }

        @Override
        public FileTree getSource() {
            return getSourceRootsForThisSpec().getAsFileTree().matching(this.getPatternSet());
        }

        @Override
        public FileTree getAllSource() {
            final ImmutableList.Builder<FileTreeInternal> builder = ImmutableList.builder();