this.fileSystem = fileSystem;
    }

    private boolean shouldVisit(FileTreeElement element) {
        return spec.isSatisfiedBy(element);
    }

    @Override
    public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) {
        FileVisitDetails details = getFileVisitDetails(dir, attrs);
        if (directoryDetailsHolder.size() == 0 || shouldVisit(details)) {
            directoryDetailsHolder.push(details);

		b.matchcap = make([]int, ncap)
	} else {
		b.matchcap = b.matchcap[:ncap]
	}
	for i := range b.matchcap {
		b.matchcap[i] = -1
	}
}

// shouldVisit reports whether the combination of (pc, pos) has not
// been visited yet.
func (b *bitState) shouldVisit(pc uint32, pos int) bool {
	n := uint(int(pc)*(b.end+1) + pos)
	if b.visited[n/visitedBits]&(1<<(n&(visitedBits-1))) != 0 {
		return false
	}

        }

        private boolean shouldVisitDirectory(Path dir, String internedName) {
            return pathTracker.isRoot() || shouldVisit(dir, internedName, true);
        }

        private boolean shouldVisitFile(Path file, String internedName) {
            return shouldVisit(file, internedName, false);
        }

        return functionScoreQuery;
    }

    protected BoolQueryBuilder regBoolCQ(List<QueryBuilder> mustList, List<QueryBuilder> shouldList, List<QueryBuilder> mustNotList,
            List<QueryBuilder> filterList) {
        assertObjectNotNull("mustList", mustList);
        assertObjectNotNull("shouldList", shouldList);
        assertObjectNotNull("mustNotList", mustNotList);
        assertObjectNotNull("filterList", filterList);

        return functionScoreQuery;
    }

    protected BoolQueryBuilder regBoolCQ(List<QueryBuilder> mustList, List<QueryBuilder> shouldList, List<QueryBuilder> mustNotList,
            List<QueryBuilder> filterList) {
        assertObjectNotNull("mustList", mustList);
        assertObjectNotNull("shouldList", shouldList);
        assertObjectNotNull("mustNotList", mustNotList);
        assertObjectNotNull("filterList", filterList);

        return functionScoreQuery;
    }

    protected BoolQueryBuilder regBoolCQ(List<QueryBuilder> mustList, List<QueryBuilder> shouldList, List<QueryBuilder> mustNotList,
            List<QueryBuilder> filterList) {
        assertObjectNotNull("mustList", mustList);
        assertObjectNotNull("shouldList", shouldList);
        assertObjectNotNull("mustNotList", mustNotList);
        assertObjectNotNull("filterList", filterList);