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Viewing changes to src/location_service/com/ubuntu/location/state_tracking_provider.h

Expose service::State to the bus. (LP: #1536774)

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src/location_service/com/ubuntu/location/state_tracking_provider.h
 
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/*
 
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 * Copyright © 2016 Canonical Ltd.
 
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 *
 
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 * This program is free software: you can redistribute it and/or modify it
 
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 * under the terms of the GNU Lesser General Public License version 3,
 
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 * as published by the Free Software Foundation.
 
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 *
 
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 * This program is distributed in the hope that it will be useful,
 
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
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 * GNU Lesser General Public License for more details.
 
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 *
 
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 * You should have received a copy of the GNU Lesser General Public License
 
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 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
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 *
 
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 * Authored by: Thomas Voß <thomas.voss@canonical.com>
 
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 */
 
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#ifndef LOCATION_SERVICE_COM_UBUNTU_LOCATION_STATE_TRACKING_PROVIDER_H_
 
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#define LOCATION_SERVICE_COM_UBUNTU_LOCATION_STATE_TRACKING_PROVIDER_H_
 
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#include <com/ubuntu/location/provider.h>
 
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#include <memory>
 
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namespace com
 
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{
 
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namespace ubuntu
 
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{
 
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namespace location
 
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{
 
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// StateTrackingProvider keeps track of the State of an individual provider instance.
 
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//
 
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// TODO(tvoss): Factor this functionality into the public interface once we find time
 
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// to break API/ABI of providers.
 
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class StateTrackingProvider : public Provider
 
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{
 
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public:
 
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    // Safe us some typing
 
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    typedef std::shared_ptr<StateTrackingProvider> Ptr;
 
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    // State models the different states of a provider.
 
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    enum class State
 
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    {
 
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        active, // The provider is actively delivering updates.
 
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        enabled // The provider is enabled but not actively delivering updates.
 
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    };
 
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    StateTrackingProvider(const Provider::Ptr& impl)
 
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        : impl_{impl},
 
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          connections
 
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          {
 
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              impl_->updates().position.connect(
 
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                  [this](const Update<Position>& u)
 
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                  {
 
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                      mutable_updates().position(u);
 
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                  }),
 
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              impl_->updates().heading.connect(
 
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                  [this](const Update<Heading>& u)
 
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                  {
 
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                      mutable_updates().heading(u);
 
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                  }),
 
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              impl_->updates().velocity.connect(
 
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                  [this](const Update<Velocity>& u)
 
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                  {
 
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                      mutable_updates().velocity(u);
 
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                  })
 
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           },
 
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          state_{State::enabled}
 
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    {
 
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    }
 
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    const core::Property<State>& state() const
 
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    {
 
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        return state_;
 
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    }
 
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    bool supports(const Features& f) const override
 
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    {
 
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        return impl_->supports(f);
 
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    }
 
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    bool requires(const Requirements& r) const override
 
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    {
 
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        return impl_->requires(r);
 
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    }
 
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    bool matches_criteria(const Criteria& criteria) override
 
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    {
 
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        return impl_->matches_criteria(criteria);
 
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    }
 
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    void on_wifi_and_cell_reporting_state_changed(WifiAndCellIdReportingState state) override
 
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    {
 
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        impl_->on_wifi_and_cell_reporting_state_changed(state);
 
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    }
 
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    void on_reference_location_updated(const Update<Position>& position) override
 
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    {
 
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        impl_->on_reference_location_updated(position);
 
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    }
 
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    void on_reference_velocity_updated(const Update<Velocity>& velocity) override
 
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    {
 
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        impl_->on_reference_velocity_updated(velocity);
 
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    }
 
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    void on_reference_heading_updated(const Update<Heading>& heading) override
 
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    {
 
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        impl_->on_reference_heading_updated(heading);
 
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    }
 
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    void start_position_updates() override
 
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    {
 
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        state_ = State::active;
 
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        impl_->state_controller()->start_position_updates();
 
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    }
 
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    void stop_position_updates() override
 
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    {
 
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        state_ = State::enabled;
 
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        impl_->state_controller()->stop_position_updates();
 
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    }
 
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    void start_velocity_updates() override
 
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    {
 
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        state_ = State::active;
 
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        impl_->state_controller()->start_velocity_updates();
 
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    }
 
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    void stop_velocity_updates() override
 
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    {
 
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        state_ = State::enabled;
 
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        impl_->state_controller()->stop_velocity_updates();
 
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    }
 
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    void start_heading_updates() override
 
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    {
 
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        state_ = State::active;
 
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        impl_->state_controller()->start_heading_updates();
 
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    }
 
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    void stop_heading_updates() override
 
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    {
 
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        state_ = State::enabled;
 
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        impl_->state_controller()->stop_heading_updates();
 
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    }
 
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private:
 
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    Provider::Ptr impl_;
 
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    struct
 
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    {
 
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        core::ScopedConnection position_updates;
 
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        core::ScopedConnection heading_updates;
 
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        core::ScopedConnection velocity_updates;
 
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    } connections;
 
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    core::Property<State> state_;
 
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};
 
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}
 
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}
 
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}
 
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#endif // LOCATION_SERVICE_COM_UBUNTU_LOCATION_STATE_TRACKING_PROVIDER_H_