匹配器用于同时匹配对象的不同属性

Question

我试图通过org.hamcrest.Matchers匹配对象的两个不同属性。

List<LeaveApply> leaveApplyList = Lambda.select(
   allLeaveApplyList,
       Matchers.allOf(
            Lambda.having(
                Lambda.on(LeaveApply.class).getUser().getId(),   
                Matchers.equalTo(userId)), 
            Lambda.having(
                Lambda.on(LeaveApply.class).getDate(),
                Matchers.allOf(
                    Matchers.greaterThanOrEqualTo(fromDate), 
                    Matchers.lessThanOrEqualTo(toDate)))
                 )
              );

它给出了一个LeaveApply Object的List，它的user-id等于给定的id, date小于等于to-date，大于等于from-date。它正在起作用。我想知道这是匹配不同属性字段的正确方法吗?

Answer 1

它应该工作，就我所见。您可以做两个改进:使用静态导入使其更具可读性;使用having(...).and(...)而不是使用allOf:

import static ch.lambdaj.Lambda.*;
import static org.hamcrest.Matchers.*;
List<LeaveApply> leaveApplyList = select(allLeaveApplyList, having(on(LeaveApply.class).getUser().getId(), equalTo(userId)).and(on(LeaveApply.class).getDate(), allOf(greaterThanOrEqualTo(fromDate), lessThanOrEqualTo(toDate)))));