java中mongo的条件查询

@Override
    public Page<ProductInfo> findAll(Pageable pageable, ProductInfo productInfo) {
	//创建一个操作聚合operations
        List<AggregationOperation> operations = new ArrayList<>();
	//创建一个条件类criteria
        Criteria criteria = new Criteria();
	//商品状态不为空
        if (productInfo.getProductStatus()!=null){
	　　 //productStatus等于查询的商品状态这个条件添加进操作聚合operations
            operations.add(Aggregation.match(criteria.and("productStatus").is(productInfo.getProductStatus())));
        }
        long totalCount = 0;
        //总页数
        if (operations!= null && operations.size() > 0){
	    //操作聚合
            Aggregation aggregationCount = newAggregation(operations);
	    //查询总的数据条数，返回一个集合
            AggregationResults<ProductInfo> resultsCount = mongoTemplate.aggregate(aggregationCount, "productInfo", ProductInfo.class);
            totalCount = resultsCount.getMappedResults().size();
        }else{
	    //操作聚合为空，查询总的数据条数
            totalCount = mongoTemplate.findAll(ProductInfo.class).size();
        }
	//操作聚合添加页数乘以每页大小等于总页数
        operations.add(Aggregation.skip((long) (pageable.getPageNumber()) * pageable.getPageSize()));
	//操作聚合添加返回一页的数据
        operations.add(Aggregation.limit(pageable.getPageSize()));
	//操作聚合添加根据solveCount降序排序
        // operations.add(Aggregation.sort(Sort.Direction.DESC, "solveCount"));
        Aggregation aggregation = newAggregation(operations);
	//根据条件查询数据
        AggregationResults<ProductInfo> results = mongoTemplate.aggregate(aggregation, "productInfo", ProductInfo.class);
	//返回结果的map和分页信息和总记录数
        return new PageImpl<>(results.getMappedResults(),pageable,totalCount);
    }