User.java

/**
  This object represents JSON string:
  {
      "email" : "[email protected]",
      "waypoints" : {
        "-KH9UAPH5NmLJExaUa5g" : {
          "-KH9UAPH5NmLJExaS2s" : {
            "latitude" : 111,
            "longitude" : 111.1
          }
        },
        "-KHB1VjqUdO90vxj9XCh" : {
          "-KHB1VjqUdO90vxj9XCi" : {
            "latitude" : 222.1,
            "longitude" : 222.11
          },
          "-KHB1ZykbwgXM9sPNie9" : {
            "latitude" : 222.2,
            "longitude" : 222.22
          }
        }
      }
    }
  
*/
public class User{
  String email;
  Object waypoints;
  public User(){}
  
  public String getEmail(){return this.email; }
  public void setEmail(String _email){this.email = _email;}
  
  public Object getWaypoints(){return waypoints'}
  public void setWaypoints(Object points){ this.waypoints = points;}
  
  public Map<String, MyWaypoint> getMyWaypoints(){
     if(waypoints == null || waypoint.toString().isEmpty()){ return null; }
     JSONObject waypointJSON = new JSONObject(waypoint.toString());
     //convert to Map
     Map<String, MyWaypoint> map = new HashMap<String, MyWaypoint>();
     Iterator<String> keysIterator = waypointJSON.keys();
     while(keysIterator.hasNext()) {
        String key = keysIterator.next();
        Object value = object.get(key);
        //the value is JSONObject - something like
        /*
          "-KH9UAPH5NmLJExaS2s" : {"latitude" : 111,"longitude" : 111.1}, {}, {}
          So to iterate through all these
        */
         if(value instanceof JSONObject) {
            valueJSONObject = (JSONObject)value;
            Iterator<String> valueKeysIterator = valueJSONObject.keys();
            while(valueKeysIterator.hasNext()){
              //the value of each key is the MyWaypoint object
              String valueKey = valueKeysIterator.next();
              JSONObject myWayPointJsonValue = (JSONObject)object.get(valueKey);
              MyWaypoint myWayPointInstance = new MyWaypoint(myWayPointJsonValue.get("latitute"), myWayPointJsonValue.get("longitude"));
              map.put(valueKey, myWayPointInstance);
            } 
        }
        
    }
    return map;
  }
}