使用在 Kotlin/Java 中输入的异构地图
我从数据库中读取一些 JSON 项目并创建一个 Mapmap.child.prop）时，我需要像这样：
val prop = (parentMap["child"] as Map<String, Any>)["prop"]
我知道有 Apache Commons 提供了 PropertyUtils.getProperty(map, "map.child.prop"))，但这并不完全是我想要的。该对象非常复杂，我需要在输入时处理整个地图。有这样的选择吗？由于该项目是一张大地图，选角变得很疯狂，但目前这是我唯一的解决方案。
我尝试过的方法：
- 将地图转换为类
- 太长
- 当您添加一些键/值时，地图类型似乎是连续构建的。但我不是持续构建，而是从 JSON 进行转换。
- 使用 Kotlin 委托属性
- 对于平面结构效果很好，但在深入时需要进行转换。
I read some items from DB as JSON and create a Map<String, Any> from each of them. I want to process the items as Map because instantiating objects using Jackson Object Mapper's .convertValue took a long time (decimals of milliseconds more than with Map, per item). However, the type of the map is not uniform and when I need to for example get some nested prop (e.g. map.child.prop), I need to go like this:
val prop = (parentMap["child"] as Map<String, Any>)["prop"]
I am aware there is Apache Commons providing PropertyUtils.getProperty(map, "map.child.prop")), but it is not exactly what I want. The object is quite complex and I need to work with the whole map as it was typed. Is there such an option? The casting goes crazy as the item is a big map, but currently the only solution I have.
What I tried:
- Convert map to class
- Too long
- Using typed map library https://github.com/broo2s/typedmap
- The map type seems to be built continuously as you add some key/value. But I am not building continuously, I am converting from JSON.
- Using Kotlin delegated properties
- Works well for flat structure, but needs to casting when going deeper.
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