ubuntu-location-service  ..
An aggregating location service providing positioning and geocoding capabilities to applications.
newer_or_more_accurate_update_selector.h
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1 /*
2  * Copyright © 2016 Canonical Ltd.
3  *
4  * This program is free software: you can redistribute it and/or modify it
5  * under the terms of the GNU Lesser General Public License version 3,
6  * as published by the Free Software Foundation.
7  *
8  * This program is distributed in the hope that it will be useful,
9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11  * GNU Lesser General Public License for more details.
12  *
13  * You should have received a copy of the GNU Lesser General Public License
14  * along with this program. If not, see <http://www.gnu.org/licenses/>.
15  *
16  * Authored by: Scott Sweeny <scott.sweeny@canonical.com
17  */
18 #ifndef LOCATION_SERVICE_COM_UBUNTU_LOCATIONNEWER_OR_MORE_ACCURATE_UPDATE_SELECTOR_H
19 #define LOCATION_SERVICE_COM_UBUNTU_LOCATIONNEWER_OR_MORE_ACCURATE_UPDATE_SELECTOR_H
20 
22 
23 namespace com
24 {
25 namespace ubuntu
26 {
27 namespace location
28 {
30 {
31 public:
32  typedef std::shared_ptr<NewerOrMoreAccurateUpdateSelector> Ptr;
33 
35  const Update<Position>& newer) override
36  {
37  // Basically copied this value from the Android fusion provider
38  static const std::chrono::seconds cutoff(11);
39 
40  // If the new position is newer by a significant margin then just use it
41  if (newer.when > older.when + cutoff) {
42  return newer;
43  }
44 
45  // Choose the position with the smaller accuracy circle if both have them
46  if (!older.value.accuracy.horizontal)
47  return newer;
48  if (!newer.value.accuracy.horizontal)
49  return older;
50  if (newer.value.accuracy.horizontal < older.value.accuracy.horizontal)
51  return newer;
52  else
53  return older;
54  }
55 };
56 }
57 }
58 }
59 #endif // LOCATION_SERVICE_COM_UBUNTU_LOCATIONNEWER_OR_MORE_ACCURATE_UPDATE_SELECTOR_H
60 
Templated class that wraps a value and timestamp.
Definition: update.h:36
Definition: accuracy.h:23
Clock::Timestamp when
Definition: update.h:73
Update< Position > select(const Update< Position > &older, const Update< Position > &newer) override