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-rw-r--r--src/Location.vala238
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diff --git a/src/Location.vala b/src/Location.vala
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-/*
-FIXME: Remember to unref the needed things!
-
-*/
-using ContextProvider;
-
-namespace ContextKit {
-
- namespace Location2 {
- // Data type for the locally stored location data
- struct LocationData {
- public double latitude;
- public double longitude;
- public double altitude;
-
- public bool latlong_valid;
- public bool altitude_valid;
- }
-
- public class Provider : GLib.Object, ContextProvider.Provider {
- ProviderMixins.SubscriberList subscribed;
-
- // contextd keys this plugin takes care of
- const Key[] keys = {
- {
- "Context.Environment.Location.latitude",
- ValueType.DOUBLE
- },
- {
- "Context.Environment.Location.longitude",
- ValueType.DOUBLE
- },
- {
- "Context.Environment.Location.altitude",
- ValueType.DOUBLE
- }
- };
-
- StringSet location_keys;
-
- StringSet subscribed_keys = new StringSet();
-
- // Stores the last known location
- static LocationData current_location;
-
- // Device for using liblocation
- Location.GPSDevice m_device;
-
- void subscription_removed (ProviderMixins.SubscriberList l, Subscriber s) {
- // TODO: Check here whether the connection to the loc service should be closed?
-
- // FIXME: Do we have to remove it from the subscription list manually? Should the subscription list be part of the superclass?
- }
-
- /* Constructor
- Connect the liblocation signals to correct functions.
- Possibly: Indicate to liblocation that we're intrested in location data and start listening.
- */
- public Provider () {
-
- // Create plugin-related data structures
- subscribed = new ProviderMixins.SubscriberList();
- subscribed.removed += subscription_removed;
-
- location_keys = new StringSet.from_array (new string[] {
- "Context.Environment.Location.latitude",
- "Context.Environment.Location.longitude",
- "Context.Environment.Location.altitude"
- });
-
- // Invalidate the initial data
- current_location.latlong_valid = false;
- current_location.altitude_valid = false;
-
- // Fetch an instance of the LocationGPSDControl
- Location.GPSDControl control;
- control = control.get_default();
-
- // Connect signals from LocationGPSDControl
- control.error += CB_Error;
- control.gpsd_running += CB_Running;
- control.gpsd_stopped += CB_Stopped;
-
- // Indicate that we want to use only ACWP to avoid starting the GPS if it is not already running.
- control.preferred_method = Location.Method.ACWP;
-
- control.start(); // FIXME: This is only for testing.
-
- // Create a LocationGPSDevice
- m_device = new Location.GPSDevice();
-
- // Connect signals from device
- m_device.changed += CB_Changed;
- m_device.connected += CB_Connected;
- m_device.disconnected += CB_Disconnected;
-
- m_device.start(); // FIXME: This is only for testing
-
- // FIXME: Do we need to unref control? Or does Vala handle it automatically?
-
- }
-
- // Destructor
- ~Provider() {
- // FIXME: Deleting / freeing / ... the device? How? Or does Vala handle it automatically?
- }
-
- // Handling signals from GPS control
- static void CB_Error(Location.GPSDControl? control) {
- debug("Error");
- }
-
- static void CB_Running(Location.GPSDControl? control) {
- debug("Running");
- }
-
- static void CB_Stopped(Location.GPSDControl? control) {
- debug("Stopped");
- }
-
- // Handling signals from GPS device
- void CB_Changed(Location.GPSDevice? device) {
-
- bool values_changed = false;
- if (device != null && device.fix != null) {
- debug("Changed %f %f %f", device.fix.latitude, device.fix.longitude, device.fix.altitude);
- if ((device.fix.fields & Location.GPS_DEVICE_LATLONG_SET) != 0) {
-
- if (current_location.latitude != device.fix.latitude) {
- values_changed = true;
- }
- if (current_location.longitude != device.fix.longitude) {
- values_changed = true;
- }
- current_location.latitude = device.fix.latitude;
- current_location.longitude = device.fix.longitude;
- current_location.latlong_valid = true;
- }
-
- if ((device.fix.fields & Location.GPS_DEVICE_ALTITUDE_SET) != 0) {
- if (current_location.altitude != device.fix.altitude) {
- values_changed = true;
- }
-
- current_location.altitude = device.fix.altitude;
- current_location.altitude_valid = true;
- }
- // TODO: Tresholds? If the values change only a little, ignore the change?
- }
-
- HashTable<string, TypedVariant?> ret = new HashTable<string, TypedVariant?> (str_hash,str_equal);
-
- if (subscribed_keys.is_member ("Context.Environment.Location.latitude")) {
- insert_double_key("Context.Environment.Location.latitude", ret, current_location.latitude, current_location.latlong_valid);
- }
-
- if (subscribed_keys.is_member ("Context.Environment.Location.longitude")) {
- insert_double_key("Context.Environment.Location.longitude", ret, current_location.longitude, current_location.latlong_valid);
- }
-
- if (subscribed_keys.is_member ("Context.Environment.Location.altitude")) {
- insert_double_key("Context.Environment.Location.altitude", ret, current_location.altitude, current_location.altitude_valid);
- }
-
- // TODO: Should we check whether we need the location service any more?
- // If we stop the connecton, we won't be able to answer future Get:s accurately.
-
- /* Note: We always emit the same kind of changed signal, not depending on which values have
- actually changed. */
-
- if (values_changed) {
- // Emit the "Changed" signal
- for (int i=0; i < subscribed.size; i++) {
- weak Subscriber s = subscribed.get(i);
- s.emit_changed(ret);
- }
- // TODO: Emit only for those who are intrested in the changed keys?
- }
- }
-
- static void CB_Connected(Location.GPSDevice device) {
- debug("Connected");
- }
-
- static void CB_Disconnected(Location.GPSDevice device) {
- debug("Disconnected");
- }
-
- void insert_double_key (string key, HashTable<string, TypedVariant?> ret, double double_value, bool do_insert) {
- Value v = Value (typeof(double));
-
- if (do_insert) {
- v.set_double(double_value);
- ret.insert (key, TypedVariant (ValueType.DOUBLE, v));
- }
- else {
- v.set_double (0);
- ret.insert (key, TypedVariant (ValueType.UNDETERMINED, v));
- }
- }
-
-
- public void Get (StringSet keys, HashTable<string, TypedVariant?> ret) {
- if (keys.is_disjoint (location_keys)) {
- return;
- }
-
- /*
- Note: If this is the first Get (and we don't start the service before this), the data may not be valid.
- */
-
- // Copy the internally stored information to the map
- if (keys.is_member ("Context.Environment.Location.latitude")) {
- insert_double_key("Context.Environment.Location.latitude", ret, current_location.latitude, current_location.latlong_valid);
- }
-
- if (keys.is_member ("Context.Environment.Location.longitude")) {
- insert_double_key("Context.Environment.Location.longitude", ret, current_location.longitude, current_location.latlong_valid);
- }
-
- if (keys.is_member ("Context.Environment.Location.altitude")) {
- insert_double_key("Context.Environment.Location.altitude", ret, current_location.altitude, current_location.altitude_valid);
- }
- }
-
- public void Subscribe (StringSet keys, ContextProvider.Subscriber s) {
- // FIXME: These are common to all plugins --> move to some upper level
- subscribed.add (s);
- subscribed_keys = new StringSet.union (subscribed_keys, keys);
- // FIXME: Also an intersection is needed.
- }
-
- public Key[] Keys() {
- return keys;
- }
- }
- }
-}
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