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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_GEOLOCATION_LOCATION_ARBITRATOR_IMPL_H_
#define CONTENT_BROWSER_GEOLOCATION_LOCATION_ARBITRATOR_IMPL_H_
#include "base/callback_forward.h"
#include "base/memory/scoped_vector.h"
#include "base/strings/string16.h"
#include "base/time/time.h"
#include "content/browser/geolocation/location_arbitrator.h"
#include "content/common/content_export.h"
#include "content/port/browser/location_provider.h"
#include "content/public/browser/access_token_store.h"
#include "content/public/common/geoposition.h"
#include "net/url_request/url_request_context_getter.h"
namespace net {
class URLRequestContextGetter;
}
namespace content {
class AccessTokenStore;
class LocationProvider;
// This class is responsible for handling updates from multiple underlying
// providers and resolving them to a single 'best' location fix at any given
// moment.
class CONTENT_EXPORT LocationArbitratorImpl : public LocationArbitrator {
public:
// Number of milliseconds newer a location provider has to be that it's worth
// switching to this location provider on the basis of it being fresher
// (regardles of relative accuracy). Public for tests.
static const int64 kFixStaleTimeoutMilliseconds;
typedef base::Callback<void(const Geoposition&)> LocationUpdateCallback;
explicit LocationArbitratorImpl(const LocationUpdateCallback& callback);
virtual ~LocationArbitratorImpl();
static GURL DefaultNetworkProviderURL();
// LocationArbitrator
virtual void StartProviders(bool use_high_accuracy) OVERRIDE;
virtual void StopProviders() OVERRIDE;
virtual void OnPermissionGranted() OVERRIDE;
virtual bool HasPermissionBeenGranted() const OVERRIDE;
protected:
AccessTokenStore* GetAccessTokenStore();
// These functions are useful for injection of dependencies in derived
// testing classes.
virtual AccessTokenStore* NewAccessTokenStore();
virtual LocationProvider* NewNetworkLocationProvider(
AccessTokenStore* access_token_store,
net::URLRequestContextGetter* context,
const GURL& url,
const string16& access_token);
virtual LocationProvider* NewSystemLocationProvider();
virtual base::Time GetTimeNow() const;
private:
// Takes ownership of |provider| on entry; it will either be added to
// |providers_| or deleted on error (e.g. it fails to start).
void RegisterProvider(LocationProvider* provider);
void OnAccessTokenStoresLoaded(
AccessTokenStore::AccessTokenSet access_token_store,
net::URLRequestContextGetter* context_getter);
void DoStartProviders();
// The providers call this function when a new position is available.
void LocationUpdateAvailable(const LocationProvider* provider,
const Geoposition& new_position);
// Returns true if |new_position| is an improvement over |old_position|.
// Set |from_same_provider| to true if both the positions came from the same
// provider.
bool IsNewPositionBetter(const Geoposition& old_position,
const Geoposition& new_position,
bool from_same_provider) const;
scoped_refptr<AccessTokenStore> access_token_store_;
LocationUpdateCallback callback_;
LocationProvider::LocationProviderUpdateCallback provider_callback_;
ScopedVector<LocationProvider> providers_;
bool use_high_accuracy_;
// The provider which supplied the current |position_|
const LocationProvider* position_provider_;
bool is_permission_granted_;
// The current best estimate of our position.
Geoposition position_;
// Tracks whether providers should be running.
bool is_running_;
DISALLOW_COPY_AND_ASSIGN(LocationArbitratorImpl);
};
// Factory functions for the various types of location provider to abstract
// over the platform-dependent implementations.
LocationProvider* NewSystemLocationProvider();
} // namespace content
#endif // CONTENT_BROWSER_GEOLOCATION_LOCATION_ARBITRATOR_IMPL_H_
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