TaskCreatorWrap中的map存在的意义是什么？只有get操作没有put操作

[beginnersun]

open class TaskCreatorWrap(var iAnchorTaskCreator: IAnchorTaskCreator?) : IAnchorTaskCreator {

private val map: MutableMap<String, AnchorTask?> = HashMap()

override fun createTask(taskName: String): AnchorTask? {
    val anchorTask = map[taskName]
    anchorTask?.let {
        return it
    }
    return iAnchorTaskCreator?.createTask(taskName)
}

fun checkTaskIsExits(taskName: String): Boolean {
    return map.containsKey(taskName)
}

}