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/*
* Copyright © 2012-2013 Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Authored by: Thomas Voß <thomas.voss@canonical.com>
*/
#include <com/ubuntu/location/default_provider_selection_policy.h>
#include <com/ubuntu/location/engine.h>
namespace cul = core::location;
namespace
{
struct NullProvider : public cul::Provider
{
NullProvider() = default;
};
std::shared_ptr<cul::Provider> null_provider_instance{
new NullProvider{}};
}
const cul::Provider::Ptr& cul::ProviderSelectionPolicy::null_provider()
{
return null_provider_instance;
}
cul::DefaultProviderSelectionPolicy::DefaultProviderSelectionPolicy()
{
}
cul::DefaultProviderSelectionPolicy::~DefaultProviderSelectionPolicy() noexcept
{
}
cul::ProviderSelection
cul::DefaultProviderSelectionPolicy::determine_provider_selection_for_criteria(
const cul::Criteria& criteria,
const cul::ProviderEnumerator& enumerator)
{
ProviderSelection selection{
determine_position_updates_provider(criteria, enumerator),
determine_heading_updates_provider(criteria, enumerator),
determine_velocity_updates_provider(criteria, enumerator)};
return selection;
}
cul::Provider::Ptr
cul::DefaultProviderSelectionPolicy::determine_position_updates_provider(
const cul::Criteria& criteria,
const cul::ProviderEnumerator& enumerator)
{
auto less =
[](const Provider::Ptr& lhs, const Provider::Ptr& rhs)
{
return
lhs->state_controller()->are_position_updates_running() && !rhs->state_controller()->are_position_updates_running();
};
std::set<
Provider::Ptr,
std::function<bool(const Provider::Ptr&, const Provider::Ptr&)>> matching_providers(less);
enumerator.for_each_provider(
[&](const Provider::Ptr& provider)
{
if (provider->matches_criteria(criteria))
matching_providers.insert(provider);
});
return matching_providers.empty() ? null_provider() : *matching_providers.begin();
}
cul::Provider::Ptr cul::DefaultProviderSelectionPolicy::determine_heading_updates_provider(
const cul::Criteria& criteria,
const cul::ProviderEnumerator& enumerator)
{
auto less =
[](const Provider::Ptr& lhs, const Provider::Ptr& rhs)
{
return lhs->state_controller()->are_heading_updates_running() && !rhs->state_controller()->are_heading_updates_running();
};
std::set<
Provider::Ptr,
std::function<bool(const Provider::Ptr&, const Provider::Ptr&)>> matching_providers(less);
enumerator.for_each_provider(
[&](const Provider::Ptr& provider)
{
if (provider->matches_criteria(criteria))
matching_providers.insert(provider);
});
return matching_providers.empty() ? null_provider() : *matching_providers.begin();
}
cul::Provider::Ptr cul::DefaultProviderSelectionPolicy::determine_velocity_updates_provider(
const cul::Criteria& criteria,
const cul::ProviderEnumerator& enumerator)
{
auto less =
[](const Provider::Ptr& lhs, const Provider::Ptr& rhs)
{
return lhs->state_controller()->are_velocity_updates_running() && !rhs->state_controller()->are_velocity_updates_running();
};
std::set<
Provider::Ptr,
std::function<bool(const Provider::Ptr&, const Provider::Ptr&)>> matching_providers(less);
enumerator.for_each_provider(
[&](const Provider::Ptr& provider)
{
if (provider->matches_criteria(criteria))
matching_providers.insert(provider);
});
return matching_providers.empty() ? null_provider() : *matching_providers.begin();
}
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