我使用Moshi,我需要使用越野车解决我的问题.有时,当我请求对象列表时,其中一些不包含必填字段.当然,我可以捕获并处理JsonDataException,但是我想跳过这些对象.我该如何与Moshi合作？
更新资料
我有几个完成任务的模型
@JsonClass(generateAdapter = true)
data class User(
val name: String,val age: Int?
)
@JsonClass(generateAdapter = true)
data class UserList(val list: List<User>)
和错误的JSON
{
"list": [
{
"name": "John","age": 20
},{
"age": 18
},{
"name": "Jane","age": 21
}
]
}
如您所见,第二个对象没有必填名称字段,我想通过Moshi适配器跳过它.
最佳答案
看来我找到了答案
class SkipBadListObjectsAdapterFactory : JsonAdapter.Factory {
override fun create(type: Type,annotations: MutableSet<out Annotation>,moshi: Moshi): JsonAdapter<*>? {
return if (annotations.isEmpty() && Types.getRawType(type) == List::class.java) {
val elementType = Types.collectionElementType(type,List::class.java)
val elementAdapter = moshi.adapter<Any>(elementType)
SkipBadListObjectsAdapter(elementAdapter)
} else {
null
}
}
private class SkipBadListObjectsAdapter<T : Any>(private val elementAdapter: JsonAdapter<T>) :
JsonAdapter<List<T>>() {
override fun fromJson(reader: JsonReader): List<T>? {
val goodObjectsList = mutableListOf<T>()
reader.beginArray()
while (reader.hasNext()) {
try {
elementAdapter.fromJson(reader)?.let(goodObjectsList::add)
} catch (e: JsonDataException) {
// Skip bad element ;)
}
}
reader.endArray()
return goodObjectsList
}
override fun toJson(writer: JsonWriter,value: List<T>?) {
throw UnsupportedOperationException("SkipBadListObjectsAdapter is only used to deserialize objects")
}
}
}
谢谢“来自其他主题的人” =)
