IntelliJ 不会序列化 PersistentStateComponent 子类的嵌套对象的属性

Question

这就是我的自定义

PersistentStateComponent

子类的样子：

@State(name = "Configurations", storages = [Storage("conf.xml")])
@Service(Service.Level.PROJECT)
class CustomConfigurationService : PersistentStateComponent<CustomConfigurationService> {

    var configurations = Configurations()

    override fun getState() = this

    override fun loadState(service: CustomConfigurationService) {
        XmlSerializerUtil.copyBean(service, this)
    }

    // ...
}

data class Configurations(
    val aBoolean: Boolean = false,
    val aString: String? = null,
    val anotherString: String? = null
)

这就是配置的存储方式（通过 UI 更改后）：

<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
  <component name="Configurations">
    <option name="configurations">
      <Configurations />
    </option>
  </component>
</project>

如果我将超级类型更改为

PersistentStateComponent<Configurations>

，则根本不会创建该文件。

为什么 IntelliJ 不序列化

Configurations

对象的属性？除了将

Configurations

的属性直接放在

CustomConfigurationService

内部之外，我还能做什么？

Answer 1

事实证明我被误导了。最终代码如下所示：

import com.intellij.openapi.components.BaseState

class Configurations : BaseState() {
    // property() and string() are BaseState methods
    var aBoolean by property(false)
    var aString by string(null)
    var anotherString by string(null)
}

import com.intellij.openapi.components.SimplePersistentStateComponent
import com.intellij.util.xmlb.XmlSerializerUtil

@State(name = "Configurations", storages = [Storage("conf.xml")])
@Service(Service.Level.PROJECT)
class CustomConfigurationService :
    // This takes care of everything else and gives us a .state property
    SimplePersistentStateComponent<Configurations>(Configurations()) {

    // ...which I shadow using this other property.
    override var configurations: Configurations
        get() = state
        set(value) = XmlSerializerUtil.copyBean(value, state)
    
    companion object {
        fun getInstance() = service<ConfigurationService>()
    }

}

conf.xml

的内容最终看起来像这样：

<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
  <component name="Configurations">
    <option name="aBoolean" value="true" />
    <option name="aString" value="Foobar">
  </component>
</project>