json 문서 파싱해서 Bundle로 만들기

Goal

• json 텍스트를 파싱해서 Bundle 객체로 만들기
• String, Int, Float, Array 등 타입 모두 처리하기

Implementation

json 파싱

private fun bundleFromJson(json: String): Bundle {
    val jsonObject = JSONObject(json)
    jsonObject.keys().forEach { key ->
        val value = jsonObject.get(key)
        ...
    }
}

jsonObject 에서 얻은 value 타입별로 처리

• Any 로 얻은 값의 simpleName 을 얻어서 처리

val value: Any = jsonObject.get(key)
when (value::class.simpleName) {
    "String" -> ...
    "Int" -> ...
    "Long" -> ...
    "Boolean" -> ...
    "Float" -> ...
    "Double" -> ...
    "JSONObject" -> ...
    "JSONArray" -> ...
    else -> ...  // 그 외는 전부 String 으로 처리하자
}

bundleFromJson

fun bundleFromJson(json: String): Bundle {
    val bundle: Bundle = Bundle()

    val jsonObject = JSONObject(json)
    jsonObject.keys().forEach { key ->
        val value = jsonObject.get(key)
        when (value::class.simpleName) {
            "String" -> bundle.putString(key, value as String)
            "Int" -> bundle.putInt(key, value as Int)
            "Long" -> bundle.putLong(key, value as Long)
            "Boolean" -> bundle.putBoolean(key, value as Boolean)
            "Float" -> bundle.putFloat(key, value as Float)
            "Double" -> bundle.putDouble(key, value as Double)
            "JSONObject" -> bundle.putBundle(key, bundleFromJson(value.toString()))
            "JSONArray" -> bundle.putBundle(key, bundleFromJsonArray(value.toString()))  // TODO: array 는 따로 처리 필요
            else -> bundle.putString(key, value::class.simpleName)
        }
    }

    return bundle
}

bundleFromJsonArray

fun bundleFromJsonArray(json: String): Bundle {
    val bundle: Bundle = Bundle()

    val jsonArray = JSONArray(json)
    for (i in 0 until jsonArray.length()) {
        bundle.putAll(bundleFromJson(jsonArray[i].toString()))
    }

    return bundle
}

Source Code

• https://gist.github.com/iamchiwon/b283e9858a812dc8263a9eb924e31cb6

Test

@Test
fun testBundleFromJson() {
    val json = """
        {
            "name": "홍길동",
            "age": 20,
            "address": [
                {
                    "city": "서울",
                    "street": "강남구"
                }
            ]
        }
    """.trimIndent()

    val bundle = bundleFromJson(json)

    assertEquals(bundle.getString("name"), "홍길동")
    assertEquals(bundle.getInt("age"), 20)
    assertEquals(bundle.getBundle("address")?.getString("city"), "서울")
    assertEquals(bundle.getBundle("address")?.getString("street"), "강남구")
}