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Converting Metar data in CSV format to JSON using NOAA's Text Data Server
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| object Api { | |
| private const val endpoint = "https://www.aviationweather.gov/adds/dataserver_current/" | |
| private val scalarConverter by lazy { ScalarsConverterFactory.create() } | |
| private val jsonConverter by lazy { GsonConverterFactory.create() } | |
| private val client by lazy { | |
| OkHttpClient.Builder() | |
| .addInterceptor { chain -> | |
| val original: Request = chain.request() | |
| val originalHttpUrl: HttpUrl = original.url() | |
| val url = originalHttpUrl.newBuilder() | |
| .addQueryParameter("dataSource", "metars") | |
| .addQueryParameter("requestType", "retrieve") | |
| .addQueryParameter("format", "csv") | |
| .build() | |
| val requestBuilder: Request.Builder = original.newBuilder() | |
| .url(url) | |
| val request: Request = requestBuilder.build() | |
| chain.proceed(request) | |
| } | |
| .addInterceptor(MetarServiceInterceptor()) | |
| .build() | |
| } | |
| fun <T> service(clazz: Class<T>): T = | |
| Retrofit.Builder() | |
| .baseUrl(endpoint) | |
| .client(client) | |
| .addConverterFactory(scalarConverter) | |
| .addConverterFactory(jsonConverter) | |
| .build().create(clazz) | |
| } |
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| object Messages { | |
| private const val BUNDLE_NAME = "internationalization.messages" //$NON-NLS-1$ | |
| private var fResourceBundle: ResourceBundle | |
| init { | |
| fResourceBundle = ResourceBundle.getBundle(BUNDLE_NAME) | |
| } | |
| fun setLocale(locale: Locale) { | |
| Locale.setDefault(locale) | |
| ResourceBundle.clearCache() | |
| fResourceBundle = ResourceBundle.getBundle(BUNDLE_NAME, locale) | |
| } | |
| fun getString(message: String): String { | |
| return fResourceBundle.getString(message) | |
| } | |
| fun getString(message: String, vararg arguments: Any?): String? { | |
| return MessageFormat.format(getString(message), *arguments) | |
| } | |
| } |
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| # Allowed values: SKC|CLR|CAVOK|FEW|SCT|BKN|OVC|OVX | |
| CloudQuantity.SKC=Clear | |
| CloudQuantity.CLR=Clear | |
| CloudQuantity.CAVOK=Ceiling and visibility OK | |
| CloudQuantity.FEW=Few | |
| CloudQuantity.SCT=Scattered | |
| CloudQuantity.BKN=Broken | |
| CloudQuantity.NSC=No significant clouds. | |
| CloudQuantity.OVC=Overcast | |
| CloudQuantity.OVX=Obscured | |
| SkyCondition.message={0} at {1, number, integer} | |
| SkyCondition.title=Sky Condition | |
| MetarView.title=Station {0} | |
| MetarView.noStation=No Station | |
| Message.noData=No Data |
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| data class Metar( | |
| val rawText: String?, | |
| val stationId: String?, | |
| val observationTime: String?, | |
| val latitude: Float?, // float | |
| val longitude: Float?, // float | |
| val tempC: Float?, // float | |
| val dewpointC: Float?, // float | |
| val windDirDegrees: Int?, // int | |
| val windSpeedKt: Int?, // int | |
| val windGustKt: Int?, // int | |
| val visibilityStatuteMi: Float?, // float | |
| val altimInHg: Float?, // float | |
| val seaLevelPressureMb: Float?, // float | |
| val qualityControlFlags: QualityControlFlags?, | |
| val wxString: String?, | |
| val skyCondition: List<SkyCondition>?, | |
| val flightCategory: String?, | |
| val threeHrPressureTendencyMb: Float?, // float | |
| val maxTC: Float?, // float | |
| val minTC: Float?, // float | |
| val maxT24hrC: Float?, // float | |
| val minT24hrC: Float?, // float | |
| val precipIn: Float?, // float | |
| val pcp3hrIn: Float?, // float | |
| val pcp6hrIn: Float?, // float | |
| val pcp24hrIn: Float?, // float | |
| val snowIn: Float?, // float | |
| val vertVisFt: Float?, // float | |
| val metarType: String?, | |
| val elevationM: Float? // float | |
| ) { | |
| override fun toString(): String { | |
| return rawText ?: "No Data" | |
| } | |
| } |
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| object MetarJsonConverter { | |
| fun encode(responseText: String): String { | |
| val lines = responseText.trim().split("\n") | |
| val gson = GsonBuilder().setPrettyPrinting().create() | |
| validateResponseText(lines) | |
| val json = getJson(lines) | |
| return gson.toJson(json).toString() | |
| } | |
| private fun getJson(lines: List<String>): JsonObject { | |
| val json = JsonObject() | |
| json.addProperty("errors", lines[0]) | |
| json.addProperty("warnings", lines[1]) | |
| json.addProperty("timeTaken", lines[2]) | |
| json.addProperty("dataSource", lines[3]) | |
| json.addProperty("numResults", lines[4]) | |
| json.add("data", getData(lines)) | |
| return json | |
| } | |
| private fun getData(lines: List<String>): JsonArray { | |
| val metars = getMetars(lines) | |
| val jsonArray = JsonArray() | |
| metars.forEach { metar -> | |
| jsonArray.add(metar(metar)) | |
| } | |
| return jsonArray | |
| } | |
| private fun getMetars(lines: List<String>): List<Metar> { | |
| val indices = 6 until lines.size | |
| val metars = mutableListOf<Metar>() | |
| for (i in indices) | |
| metars.add(CsvMapper.decode(lines[i])) | |
| return metars | |
| } | |
| private fun metar(metar: Metar): JsonObject { | |
| val jsonObject = JsonObject() | |
| jsonObject.addProperty("rawText", metar.rawText) | |
| jsonObject.addProperty("stationId", metar.stationId) | |
| jsonObject.addProperty("observationTime", metar.observationTime) | |
| jsonObject.addProperty("latitude", metar.latitude) | |
| jsonObject.addProperty("longitude", metar.longitude) | |
| jsonObject.addProperty("tempC", metar.tempC) | |
| jsonObject.addProperty("dewpointC", metar.dewpointC) | |
| jsonObject.addProperty("windDirDegrees", metar.windDirDegrees) | |
| jsonObject.addProperty("windSpeedKt", metar.windSpeedKt) | |
| jsonObject.addProperty("windGustKt", metar.windGustKt) | |
| jsonObject.addProperty("visibilityStatuteMi", metar.visibilityStatuteMi) | |
| jsonObject.addProperty("altimInHg", metar.altimInHg) | |
| jsonObject.addProperty("seaLevelPressureMb", metar.seaLevelPressureMb) | |
| jsonObject.add("qualityControlFlags", qualityControlFlags(metar.qualityControlFlags)) | |
| jsonObject.addProperty("wxString", metar.wxString) | |
| jsonObject.add("skyCondition", skyConditions(metar)) | |
| jsonObject.addProperty("flightCategory", metar.flightCategory) | |
| jsonObject.addProperty("threeHrPressureTendencyMb", metar.threeHrPressureTendencyMb) | |
| jsonObject.addProperty("maxTC", metar.maxTC) | |
| jsonObject.addProperty("minTC", metar.minTC) | |
| jsonObject.addProperty("maxT24hrC", metar.maxT24hrC) | |
| jsonObject.addProperty("minT24hrC", metar.minT24hrC) | |
| jsonObject.addProperty("precipIn", metar.precipIn) | |
| jsonObject.addProperty("pcp3hrIn", metar.pcp3hrIn) | |
| jsonObject.addProperty("pcp6hrIn", metar.pcp6hrIn) | |
| jsonObject.addProperty("pcp24hrIn", metar.pcp24hrIn) | |
| jsonObject.addProperty("snowIn", metar.snowIn) | |
| jsonObject.addProperty("vertVisFt", metar.vertVisFt) | |
| jsonObject.addProperty("metarType", metar.metarType) | |
| jsonObject.addProperty("elevationM", metar.elevationM) | |
| return jsonObject | |
| } | |
| private fun qualityControlFlags(flags: QualityControlFlags?): JsonObject { | |
| val jsonObject = JsonObject() | |
| jsonObject.addProperty("autoStation", flags?.autoStation) | |
| jsonObject.addProperty("auto", flags?.auto) | |
| jsonObject.addProperty("presentWeatherSensorOff", flags?.presentWeatherSensorOff) | |
| jsonObject.addProperty("noSignal", flags?.noSignal) | |
| jsonObject.addProperty("maintenanceIndicatorOn", flags?.maintenanceIndicatorOn) | |
| jsonObject.addProperty("lightningSensorOff", flags?.lightningSensorOff) | |
| jsonObject.addProperty("freezingRainSensorOff", flags?.freezingRainSensorOff) | |
| jsonObject.addProperty("corrected", flags?.corrected) | |
| return jsonObject | |
| } | |
| private fun skyConditions(metar: Metar): JsonArray { | |
| val conditions = JsonArray() | |
| metar.skyCondition?.forEach { condition -> | |
| val jsonObject = JsonObject() | |
| jsonObject.addProperty("skyCover", condition.skyCover) | |
| jsonObject.addProperty("cloudBaseFtAgl", condition.cloudBaseFtAgl) | |
| conditions.add(jsonObject) | |
| } | |
| return conditions | |
| } | |
| private fun validateResponseText(lines: List<String>) { | |
| when { | |
| lines.isEmpty() -> throw FileParseException("Empty server response") | |
| lines.size < 5 -> throw FileParseException("Invalid server response") | |
| lines.size == 6 -> throw FileParseException("Missing server data") | |
| } | |
| } | |
| class FileParseException(message:String): Exception(message) | |
| } |
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| class MetarServiceInterceptor : Interceptor { | |
| @Throws(IOException::class) | |
| override fun intercept(chain: Interceptor.Chain): Response { | |
| val request = chain.request() | |
| val response = chain.proceed(request) | |
| val source = response.body()!!.source() | |
| source.request(Long.MAX_VALUE) // Buffer the entire body. | |
| val buffer: Buffer = source.buffer() | |
| val responseBodyString: String = buffer.clone().readString(Charset.forName("UTF-8")) | |
| if (response.code() == 200) { | |
| val metarResponse = MetarJsonConverter.encode(responseBodyString) | |
| val contentType = MediaType.parse("application/json; charset=utf-8") | |
| val body = ResponseBody.create(contentType, metarResponse) | |
| return response.newBuilder().body(body).build() | |
| } | |
| return response | |
| } | |
| } |
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| data class QualityControlFlags ( | |
| val autoStation: String?, | |
| val auto: String?, | |
| val presentWeatherSensorOff: String?, | |
| val noSignal: String?, | |
| val maintenanceIndicatorOn: String?, | |
| val lightningSensorOff: String?, | |
| val freezingRainSensorOff: String?, | |
| val corrected: String? | |
| ) |
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| data class SkyCondition ( | |
| val skyCover: String, | |
| val cloudBaseFtAgl: Int? = null | |
| ) { | |
| override fun toString(): String { | |
| val cover = Messages.getString("CloudQuantity.$skyCover") | |
| return if (cloudBaseFtAgl == null) | |
| cover | |
| else | |
| return Messages.getString("SkyCondition.message", cover, cloudBaseFtAgl) ?: "Bad Message Format" | |
| } | |
| } |
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| { | |
| "errors": "No errors", | |
| "warnings": "No warnings", | |
| "timeTaken": "5 ms", | |
| "dataSource": "data source\u003dmetars", | |
| "numResults": "2 results", | |
| "data": [ | |
| { | |
| "rawText": "KDAL 201853Z 19012G21KT 10SM SCT037TCU BKN060 29/19 A2995 RMK AO2 SLP136 TCU N NE S-SW T02940194", | |
| "stationId": "KDAL", | |
| "observationTime": "2020-10-20T18:53:00Z", | |
| "latitude": 32.85, | |
| "longitude": -96.85, | |
| "tempC": 29.4, | |
| "dewpointC": 19.4, | |
| "windDirDegrees": 190, | |
| "windSpeedKt": 12, | |
| "windGustKt": 21, | |
| "visibilityStatuteMi": 10.0, | |
| "altimInHg": 29.949802, | |
| "seaLevelPressureMb": 1013.6, | |
| "qualityControlFlags": { | |
| "autoStation": "", | |
| "auto": "", | |
| "presentWeatherSensorOff": "TRUE", | |
| "noSignal": "", | |
| "maintenanceIndicatorOn": "", | |
| "lightningSensorOff": "", | |
| "freezingRainSensorOff": "", | |
| "corrected": "" | |
| }, | |
| "wxString": "", | |
| "skyCondition": [ | |
| { | |
| "skyCover": "SCT", | |
| "cloudBaseFtAgl": 3700 | |
| }, | |
| { | |
| "skyCover": "BKN", | |
| "cloudBaseFtAgl": 6000 | |
| } | |
| ], | |
| "flightCategory": "", | |
| "pcp3hrIn": 3700.0, | |
| "pcp24hrIn": 6000.0, | |
| "metarType": "" | |
| }, | |
| { | |
| "rawText": "KDFW 201853Z 18018KT 10SM SCT038 SCT050 29/20 A2994 RMK AO2 PK WND 18026/1813 SLP130 T02940200", | |
| "stationId": "KDFW", | |
| "observationTime": "2020-10-20T18:53:00Z", | |
| "latitude": 32.9, | |
| "longitude": -97.02, | |
| "tempC": 29.4, | |
| "dewpointC": 20.0, | |
| "windDirDegrees": 180, | |
| "windSpeedKt": 18, | |
| "visibilityStatuteMi": 10.0, | |
| "altimInHg": 29.940945, | |
| "seaLevelPressureMb": 1013.0, | |
| "qualityControlFlags": { | |
| "autoStation": "", | |
| "auto": "", | |
| "presentWeatherSensorOff": "TRUE", | |
| "noSignal": "", | |
| "maintenanceIndicatorOn": "", | |
| "lightningSensorOff": "", | |
| "freezingRainSensorOff": "", | |
| "corrected": "" | |
| }, | |
| "wxString": "", | |
| "skyCondition": [ | |
| { | |
| "skyCover": "SCT", | |
| "cloudBaseFtAgl": 3800 | |
| }, | |
| { | |
| "skyCover": "SCT", | |
| "cloudBaseFtAgl": 5000 | |
| } | |
| ], | |
| "flightCategory": "", | |
| "pcp3hrIn": 3800.0, | |
| "pcp24hrIn": 5000.0, | |
| "metarType": "" | |
| } | |
| ] | |
| } |
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