如何将树表转换为json树？

Question

数据库是Oracle，该表有3列：id，parent_id，name，其中包含公司结构的数据。

id      parent_id     name
0       -1            CEO
1        0            CMO-marketing
2        0            COO - china
3        0            Mobile BU
4        0            COO - Intel
5        0            WW - Sales
6        1            Research & Tech
7        1            Communications
8        1            Human Resources
9        2            PC BU
10       2            Sales
...

SQL查询：

select * from org connect by prior id = parent_id start with id = '0';

此SQL查询可以获取所有数据。

我想将输出转换为json树。

{"children":
    [{        
        "id":0,
        "leaf":false,
        "text":"CEO",
        "children":[
            {
                "text":"CMO-marketing",
                "id":1,
                "leaf":false,
                "children":[
                    {
                        "text":"Research & Tech",
                        "id":6,
                        "leaf": true
                    },{
                        "text":"Communications",
                        "id":7,
                        "leaf": true
                    },{
                        "text":"Human Resources",
                        "id":8,
                        "leaf": true
                    }               
                ]
            },{
                "text":"COO - china",
                "id":2,
                "leaf":false,
                "children":[
                    {
                        "text":"PC BU",
                        "id":9,
                        "leaf": true
                    },{
                        "text":"Sales",
                        "id":10,
                        "leaf": true
                    }               
                ]
            },{
                "text":"Mobile BU",
                "id":3,
                "leaf":false
            },{
                "text":"COO - Intel",
                "id":4,
                "leaf":false
            },{
                "text":"WW - Sales",
                "id":5,
                "leaf":false
            }
        ]
    }]
}

我使用java，想要一个算法来转换它。