使用Java8流的规范组合列表

如何将java8流用于此代码:

Specification<T> specification = specifications.getSpec(searchCriteria.getConditions().get(0));
        for(int i = 1; i < searchCriteria.getConditions().size(); i++) {
            specification = specification.and(getSpec(searchCriteria.getConditions().get(i)));
    }

使用流:

  IntStream.range(1,searchCriteria.getConditions().size())
                    .mapToObj(index-> getSpec(searchCriteria.getConditions().get(index)))
                    .collect();//how to merge with calling and

相关类和方法:

@Getter
@Setter
public class SearchCriteria implements Serializable{

    private static final long serialVersionUID = 1L;

    private List<Condition> conditions;
    private Integer limit;
    private Integer offset;

    @Getter
    @Setter
    public class Condition{
        private String key;
        private EConstant.OPERATION operation;
        private String value;
    }
}
public Specification<T> getSpec(SearchCriteria.Condition condition){
....
}