java - Spring Mongo>如何获取列表Aggregation中的操作

我有一个函数，可以接收Aggregation aggregation作为参数。

我想从AggregationOperation获取所有aggregation。有什么办法吗？

public Aggregation newCustomAggregation(Aggregation aggregation, Criteria c) {
    // How to get list operation aggregation there?
    listOperation.push(Aggregation.match(c));
    return Aggregation
            .newAggregation(listOperations);
}

我的目的是使用自定义Aggregation另一个新的MatchAggregation。

最佳答案

您可以通过将聚合子类化以访问受保护的操作字段来创建自己的自定义聚合实现。

就像是

public class CustomAggregation extends Aggregation {
      List<AggregationOperation> getAggregationOperations() {
      return operations;
   }
}

public Aggregation newCustomAggregation(Aggregation aggregation, Criteria c) {
     CustomAggregation customAggregation = (CustomAggregation) aggregation;
     List<AggregationOperation> listOperations = customAggregation.getAggregationOperations();
     listOperations.add(Aggregation.match(c));
     return Aggregation .newAggregation(listOperations);
 }