adds list functionality

- adds rest connection with gets a JSON Object
  with a "messages" list inside it.
- test case, which pushes a new message
  and gets an entire list. checking that the
  first element is "hello" and the last element
  to be the new element just pushed

app/src/main/java/com/example/bump/RestSingleton.kt

@@ -6,6 +6,7 @@ import com.android.volley.Request
 import com.android.volley.RequestQueue
 import com.android.volley.toolbox.*
 import com.maenle.bump.MainActivity
+import org.json.JSONArray
 
 import org.json.JSONObject
 
@@ -28,14 +29,31 @@ class RestSingleton constructor(context: Context){
         private const val URL = "http://192.168.68.127:4000/api/"
     }
 
-    fun peek(sender: String, callback: (String) -> Unit){
+    fun list(sender: String, callback: (JSONObject) -> Unit){
+        val url = URL + "list/"
+        val data = JSONObject()
+        data.put("sender", sender)
+        data.put("minutes", (60*24*365*100).toString())
+        val jsonRequest = JsonObjectRequest(Request.Method.POST, url,
+            data,
+            { response ->
+                run {
+                    callback(response)
+                }
+            } ,
+            {callback(JSONObject())})
+
+        requestQueue.add(jsonRequest)
+    }
+
+    fun peek(sender: String, callback: (JSONObject) -> Unit){
         val url = URL + "peek/"
         val data = JSONObject()
         data.put("sender", sender)
         val jsonRequest = JsonObjectRequest(Request.Method.POST, url,
             data,
-            { response -> callback(response.toString()) },
-            {callback("")})
+            { response -> callback(JSONObject(response.toString())) },
+            {callback(JSONObject())})
 
         requestQueue.add(jsonRequest)
     }
@@ -54,14 +72,14 @@ class RestSingleton constructor(context: Context){
         requestQueue.add(stringRequest)
     }
 
-    fun pop(sender: String,callback: (String) -> Unit){
+    fun pop(sender: String,callback: (JSONObject) -> Unit){
         val url = URL + "pop/"
         val data = JSONObject()
         data.put("sender", sender)
         val stringRequest = JsonObjectRequest(Request.Method.POST, url,
             data,
-            { response -> callback(response.toString()) },
-            {callback("")})
+            { response -> callback(JSONObject(response.toString())) },
+            {callback(JSONObject())})
 
         requestQueue.add(stringRequest)
     }
@@ -72,7 +90,4 @@ class RestSingleton constructor(context: Context){
         // Activity or BroadcastReceiver if someone passes one in.
         Volley.newRequestQueue(context.applicationContext)
     }
-    fun <T> addToRequestQueue(req: Request<T>) {
-        requestQueue.add(req)
-    }
 }