java中mongo的條件查詢

@Override
    public Page<ProductInfo> findAll(Pageable pageable, ProductInfo productInfo) {
	//創建一個操作聚合operations
        List<AggregationOperation> operations = new ArrayList<>();
	//創建一個條件類criteria
        Criteria criteria = new Criteria();
	//商品狀態不為空
        if (productInfo.getProductStatus()!=null){
	　　 //productStatus等於查詢的商品狀態這個條件添加進操作聚合operations
            operations.add(Aggregation.match(criteria.and("productStatus").is(productInfo.getProductStatus())));
        }
        long totalCount = 0;
        //總頁數
        if (operations!= null && operations.size() > 0){
	    //操作聚合
            Aggregation aggregationCount = newAggregation(operations);
	    //查詢總的數據條數，返回一個集合
            AggregationResults<ProductInfo> resultsCount = mongoTemplate.aggregate(aggregationCount, "productInfo", ProductInfo.class);
            totalCount = resultsCount.getMappedResults().size();
        }else{
	    //操作聚合為空，查詢總的數據條數
            totalCount = mongoTemplate.findAll(ProductInfo.class).size();
        }
	//操作聚合添加頁數乘以每頁大小等於總頁數
        operations.add(Aggregation.skip((long) (pageable.getPageNumber()) * pageable.getPageSize()));
	//操作聚合添加返回一頁的數據
        operations.add(Aggregation.limit(pageable.getPageSize()));
	//操作聚合添加根據solveCount降序排序
        // operations.add(Aggregation.sort(Sort.Direction.DESC, "solveCount"));
        Aggregation aggregation = newAggregation(operations);
	//根據條件查詢數據
        AggregationResults<ProductInfo> results = mongoTemplate.aggregate(aggregation, "productInfo", ProductInfo.class);
	//返回結果的map和分頁信息和總記錄數
        return new PageImpl<>(results.getMappedResults(),pageable,totalCount);
    }