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| @Test void testToTree() { Consumer<Object> test = o -> { List<Student> studentTree = Steam .of( Student.builder().id(1L).name("dromara").build(), Student.builder().id(2L).name("baomidou").build(), Student.builder().id(3L).name("hutool").parentId(1L).build(), Student.builder().id(4L).name("sa-token").parentId(1L).build(), Student.builder().id(5L).name("mybatis-plus").parentId(2L).build(), Student.builder().id(6L).name("looly").parentId(3L).build(), Student.builder().id(7L).name("click33").parentId(4L).build(), Student.builder().id(8L).name("jobob").parentId(5L).build() ) .toTree(Student::getId, Student::getParentId, Student::setChildren); Assertions.assertEquals(asList( Student.builder().id(1L).name("dromara") .children(asList( Student.builder().id(3L).name("hutool").parentId(1L) .children(singletonList(Student.builder().id(6L).name("looly").parentId(3L).build())) .build(), Student.builder().id(4L).name("sa-token").parentId(1L) .children(singletonList(Student.builder().id(7L).name("click33").parentId(4L).build())) .build())) .build(), Student.builder().id(2L).name("baomidou") .children(singletonList( Student.builder().id(5L).name("mybatis-plus").parentId(2L) .children(singletonList( Student.builder().id(8L).name("jobob").parentId(5L).build() )) .build())) .build() ), studentTree); }; test = test.andThen(o -> { List<Student> studentTree = Steam .of( Student.builder().id(1L).name("dromara").matchParent(true).build(), Student.builder().id(2L).name("baomidou").matchParent(true).build(), Student.builder().id(3L).name("hutool").parentId(1L).build(), Student.builder().id(4L).name("sa-token").parentId(1L).build(), Student.builder().id(5L).name("mybatis-plus").parentId(2L).build(), Student.builder().id(6L).name("looly").parentId(3L).build(), Student.builder().id(7L).name("click33").parentId(4L).build(), Student.builder().id(8L).name("jobob").parentId(5L).build() ) .toTree(Student::getId, Student::getParentId, Student::setChildren, Student::getMatchParent); Assertions.assertEquals(asList( Student.builder().id(1L).name("dromara").matchParent(true) .children(asList( Student.builder().id(3L).name("hutool").parentId(1L) .children(singletonList(Student.builder().id(6L).name("looly").parentId(3L).build())) .build(), Student.builder().id(4L).name("sa-token").parentId(1L) .children(singletonList(Student.builder().id(7L).name("click33").parentId(4L).build())) .build())) .build(), Student.builder().id(2L).name("baomidou").matchParent(true) .children(singletonList( Student.builder().id(5L).name("mybatis-plus").parentId(2L) .children(singletonList( Student.builder().id(8L).name("jobob").parentId(5L).build() )) .build())) .build() ), studentTree); }); test.accept(new Object()); }
@Test void testFlatTree() { List<Student> studentTree = asList( Student.builder().id(1L).name("dromara") .children(asList(Student.builder().id(3L).name("hutool").parentId(1L) .children(singletonList(Student.builder().id(6L).name("looly").parentId(3L).build())) .build(), Student.builder().id(4L).name("sa-token").parentId(1L) .children(singletonList(Student.builder().id(7L).name("click33").parentId(4L).build())) .build())) .build(), Student.builder().id(2L).name("baomidou") .children(singletonList( Student.builder().id(5L).name("mybatis-plus").parentId(2L) .children(singletonList( Student.builder().id(8L).name("jobob").parentId(5L).build() )) .build())) .build() ); Assertions.assertEquals(asList( Student.builder().id(1L).name("dromara").build(), Student.builder().id(2L).name("baomidou").build(), Student.builder().id(3L).name("hutool").parentId(1L).build(), Student.builder().id(4L).name("sa-token").parentId(1L).build(), Student.builder().id(5L).name("mybatis-plus").parentId(2L).build(), Student.builder().id(6L).name("looly").parentId(3L).build(), Student.builder().id(7L).name("click33").parentId(4L).build(), Student.builder().id(8L).name("jobob").parentId(5L).build() ), Steam.of(studentTree).flatTree(Student::getChildren, Student::setChildren).sorted(Comparator.comparingLong(Student::getId)).toList());
}
@Data @Builder public static class Student { @Tolerate public Student() { }
private String name; private Integer age; private Long id; private Long parentId; private List<Student> children; private Boolean matchParent; }
|