ubuntu-location-service: /build/location-service-git/src/location-service/include/location_service/com/ubuntu/location/newer_or_more_accurate_update_selector.h Source File

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
21 #include <com/ubuntu/location/update_selector.h>
22
23 namespace com
24 {
25 namespace ubuntu
26 {
27 namespace location
28 {
29 class NewerOrMoreAccurateUpdateSelector : public UpdateSelector
30 {
31 public:
32 typedef std::shared_ptr<NewerOrMoreAccurateUpdateSelector> Ptr;
33
34 WithSource<Update<Position>> select(const WithSource<Update<Position>>& older,
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_UBUNTU_LOCATIONNEWER_OR_MORE_ACCURATE_UPDATE_SELECTOR_H
65
com::ubuntu::location::NewerOrMoreAccurateUpdateSelector
Definition: newer_or_more_accurate_update_selector.h:30
com::ubuntu::location::NewerOrMoreAccurateUpdateSelector::Ptr
std::shared_ptr< NewerOrMoreAccurateUpdateSelector > Ptr
Definition: newer_or_more_accurate_update_selector.h:32
com::ubuntu::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::ubuntu::location::UpdateSelector
Definition: update_selector.h:35
com
Definition: accuracy.h:24
com::ubuntu::location::Update
Templated class that wraps a value and timestamp.
Definition: update.h:37
com::ubuntu::location::WithSource
Definition: update_selector.h:32
update_selector.h