lomiri-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_LOMIRI_LOCATIONNEWER_OR_MORE_ACCURATE_UPDATE_SELECTOR_H
19 #define LOCATION_SERVICE_COM_LOMIRI_LOCATIONNEWER_OR_MORE_ACCURATE_UPDATE_SELECTOR_H
20 
22 
23 namespace com
24 {
25 namespace lomiri
26 {
27 namespace location
28 {
30 {
31 public:
32  typedef std::shared_ptr<NewerOrMoreAccurateUpdateSelector> Ptr;
33 
35  const WithSource<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 from the same source as the old one then just use it
41  if (newer.source == older.source) {
42  return newer;
43  }
44 
45  // If the new position is newer by a significant margin then just use it
46  if (newer.value.when > older.value.when + cutoff) {
47  return newer;
48  }
49 
50  // Choose the position with the smaller accuracy circle if both have them
51  if (!older.value.value.accuracy.horizontal)
52  return newer;
53  if (!newer.value.value.accuracy.horizontal)
54  return older;
55  if (newer.value.value.accuracy.horizontal < older.value.value.accuracy.horizontal)
56  return newer;
57  else
58  return older;
59  }
60 };
61 }
62 }
63 }
64 #endif // LOCATION_SERVICE_COM_LOMIRI_LOCATIONNEWER_OR_MORE_ACCURATE_UPDATE_SELECTOR_H
65 
com::lomiri::location::NewerOrMoreAccurateUpdateSelector::Ptr
std::shared_ptr< NewerOrMoreAccurateUpdateSelector > Ptr
Definition: newer_or_more_accurate_update_selector.h:32
com::lomiri::location::NewerOrMoreAccurateUpdateSelector
Definition: newer_or_more_accurate_update_selector.h:29
update_selector.h
com::lomiri::location::UpdateSelector
Definition: update_selector.h:34
com
Definition: accuracy.h:23
com::lomiri::location::NewerOrMoreAccurateUpdateSelector::select
WithSource< Update< Position > > select(const WithSource< Update< Position >> &older, const WithSource< Update< Position >> &newer) override
Definition: newer_or_more_accurate_update_selector.h:34
com::lomiri::location::Update
Templated class that wraps a value and timestamp.
Definition: update.h:36
com::lomiri::location::WithSource
Definition: update_selector.h:32