reformat and todo

build.gradle

@@ -30,6 +30,7 @@ dependencies {
     compile group: 'org.eclipse.paho', name: 'org.eclipse.paho.client.mqttv3', version: '1.2.2'
     compile group: 'mysql',name:'mysql-connector-java',version: '8.0.18'
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
+    implementation 'com.google.code.gson:gson:2.8.6'
 }
 
 task run (type: JavaExec){

src/java/com/wasteinformationserver/website/datarequests/DeviceRequest.kt

@@ -1,5 +1,9 @@
 package com.wasteinformationserver.website.datarequests
 
+import com.google.gson.Gson
+import com.google.gson.JsonArray
+import com.google.gson.JsonObject
+import com.wasteinformationserver.basicutils.Log
 import com.wasteinformationserver.basicutils.Log.Log.debug
 import com.wasteinformationserver.basicutils.Log.Log.error
 import com.wasteinformationserver.db.JDBC
@@ -19,39 +23,58 @@ class DeviceRequest : PostRequest() {
         }
         val sb = StringBuilder()
         var deviceset: ResultSet
+
+        val gson = Gson()
+        val elem = gson.toJsonTree(Object())
+
         when (params["action"]) {
             "getdevices" -> {
                 deviceset = jdbc!!.executeQuery("SELECT * FROM `devices")
+                elem.asJsonObject.add("data", JsonArray())
                 sb.append("{\"data\":[")
                 try {
                     while (deviceset.next()) {
                         val deviceid = deviceset.getInt("DeviceID")
                         val cityid = deviceset.getInt("CityID")
                         if (cityid == -1) {
-                            sb.append("{\"deviceid\":\"").append(deviceid).append("\",\"cityid\":\"").append(cityid).append("\"}")
+                            val obj = JsonObject()
+                            obj.addProperty("deviceid", deviceid)
+                            obj.addProperty("cityid", cityid)
+                            elem.asJsonObject.get("data").asJsonArray.add(obj)
                         }
                         else {
+                            val obj = JsonObject()
                             val devicename = deviceset.getString("DeviceName")
                             val devicelocation = deviceset.getString("DeviceLocation")
-                            sb.append("{\"deviceid\":\"").append(deviceid).append("\",\"devicename\":\"").append(devicename).append("\",\"devicelocation\":\"").append(devicelocation).append("\",\"devices\":[")
+                            obj.addProperty("deviceid", deviceid)
+                            obj.addProperty("devicename", devicename)
+                            obj.addProperty("devicelocation", devicelocation)
+
+                            val locations = JsonArray()
+                            obj.add("locations", locations)
+
+                            elem.asJsonObject.get("data").asJsonArray.add(obj)
+
                             val devicecities = jdbc.executeQuery("SELECT * FROM `device_city` INNER JOIN `cities` ON device_city.CityID=cities.id WHERE `DeviceID`='$deviceid'")
                             while (devicecities.next()) {
                                 val cityidd = devicecities.getInt("id")
                                 val cityname = devicecities.getString("name")
                                 val wastetype = devicecities.getString("wastetype")
                                 val zone = devicecities.getString("zone")
-                                sb.append("{\"cityid\":\"").append(cityidd).append("\",\"cityname\":\"").append(cityname).append("\",\"wastetype\":\"").append(wastetype).append("\",\"zone\":\"").append(zone).append("\"}")
+
-                                if (!devicecities.isLast) {
+                                val objc = JsonObject()
-                                    sb.append(",")
+                                objc.addProperty("cityid", cityidd)
-                                }
+                                objc.addProperty("cityname", cityname)
+                                objc.addProperty("wastetype", wastetype)
+                                objc.addProperty("zone", zone)
+
+                                locations.add(objc)
+                                // todo better var names
+                                // todo implement in js and other methods
                             }
-                            sb.append("]}")
-                        }
-                        if (!deviceset.isLast) {
-                            sb.append(",")
                         }
                     }
-                    sb.append("]}")
+                    Log.debug(gson.toJson(elem))
                 } catch (e: SQLException) {
                     e.printStackTrace()
                 }