174 lines
5.6 KiB
Java
174 lines
5.6 KiB
Java
/*
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* Copyright (C) 2013-2017 microG Project Team
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.microg.nlp.location;
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import android.content.Context;
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import android.content.Intent;
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import android.location.Location;
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import android.location.LocationManager;
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import android.util.Log;
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import org.microg.nlp.Preferences;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.Comparator;
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import java.util.List;
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import static org.microg.nlp.api.Constants.ACTION_LOCATION_BACKEND;
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import static org.microg.nlp.api.Constants.LOCATION_EXTRA_OTHER_BACKENDS;
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class BackendFuser {
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private static final String TAG = "NlpLocationBackendFuser";
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private final List<BackendHelper> backendHelpers = new ArrayList<BackendHelper>();
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private final LocationProvider locationProvider;
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private final Context context;
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private boolean fusing = false;
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private long lastLocationReportTime = 0;
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public BackendFuser(Context context, LocationProvider locationProvider) {
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this.locationProvider = locationProvider;
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this.context = context;
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reset();
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}
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public void reset() {
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unbind();
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backendHelpers.clear();
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lastLocationReportTime = 0;
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for (String backend : Preferences
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.splitBackendString(new Preferences(context).getLocationBackends())) {
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String[] parts = backend.split("/");
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if (parts.length >= 2) {
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Intent intent = new Intent(ACTION_LOCATION_BACKEND);
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intent.setPackage(parts[0]);
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intent.setClassName(parts[0], parts[1]);
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backendHelpers.add(new BackendHelper(context, this, intent, parts.length >= 3 ? parts[2] : null));
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}
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}
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}
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public void unbind() {
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for (BackendHelper handler : backendHelpers) {
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handler.unbind();
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}
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}
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public void bind() {
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fusing = false;
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for (BackendHelper handler : backendHelpers) {
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handler.bind();
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}
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}
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public void update() {
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boolean hasUpdates = false;
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fusing = true;
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for (BackendHelper handler : backendHelpers) {
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if (handler.update() != null)
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hasUpdates = true;
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}
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fusing = false;
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if (hasUpdates)
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updateLocation();
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}
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void updateLocation() {
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List<Location> locations = new ArrayList<Location>();
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for (BackendHelper handler : backendHelpers) {
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locations.add(handler.getLastLocation());
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}
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Location location = mergeLocations(locations);
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if (location != null) {
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location.setProvider(LocationManager.NETWORK_PROVIDER);
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if (lastLocationReportTime < location.getTime()) {
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lastLocationReportTime = location.getTime();
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locationProvider.reportLocation(location);
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Log.v(TAG, "location=" + location);
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} else {
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Log.v(TAG, "Ignoring location update as it's older than other provider.");
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}
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}
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}
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private Location mergeLocations(List<Location> locations) {
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Collections.sort(locations, LocationComparator.INSTANCE);
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if (locations.isEmpty() || locations.get(0) == null)
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return null;
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if (locations.size() == 1)
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return locations.get(0);
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Location location = new Location(locations.get(0));
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ArrayList<Location> backendResults = new ArrayList<Location>();
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for (Location backendResult : locations) {
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if (locations.get(0) == backendResult)
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continue;
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if (backendResult != null)
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backendResults.add(backendResult);
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}
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if (!backendResults.isEmpty()) {
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location.getExtras().putParcelableArrayList(LOCATION_EXTRA_OTHER_BACKENDS, backendResults);
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}
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return location;
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}
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public void reportLocation() {
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if (fusing)
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return;
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updateLocation();
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}
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public void destroy() {
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unbind();
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backendHelpers.clear();
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}
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public static class LocationComparator implements Comparator<Location> {
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public static final LocationComparator INSTANCE = new LocationComparator();
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public static final long SWITCH_ON_FRESHNESS_CLIFF_MS = 30000; // 30 seconds
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/**
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* @return whether {@param lhs} is better than {@param rhs}
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*/
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@Override
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public int compare(Location lhs, Location rhs) {
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if (lhs == rhs)
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return 0;
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if (lhs == null) {
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return 1;
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}
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if (rhs == null) {
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return -1;
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}
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if (!lhs.hasAccuracy()) {
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return 1;
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}
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if (!rhs.hasAccuracy()) {
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return -1;
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}
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if (rhs.getTime() > lhs.getTime() + SWITCH_ON_FRESHNESS_CLIFF_MS) {
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return 1;
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}
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if (lhs.getTime() > rhs.getTime() + SWITCH_ON_FRESHNESS_CLIFF_MS) {
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return -1;
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}
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return (int) (lhs.getAccuracy() - rhs.getAccuracy());
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}
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}
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}
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