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
23namespace com
24{
25namespace lomiri
26{
27namespace location
28{
30{
31public:
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
WithSource< Update< Position > > select(const WithSource< Update< Position > > &older, const WithSource< Update< Position > > &newer) override
Definition accuracy.h:24
Templated class that wraps a value and timestamp.
Definition update.h:37