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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_GEOLOCATION_OBSERVER_H_
#define CONTENT_BROWSER_GEOLOCATION_GEOLOCATION_OBSERVER_H_
#include "base/basictypes.h"
#include "content/common/content_export.h"
namespace content {
struct Geoposition;
// This interface is implemented by observers of GeolocationProvider as
// well as GeolocationProvider itself as an observer of GeolocationArbitrator.
class CONTENT_EXPORT GeolocationObserver {
public:
// This will be called whenever the 'best available' location is updated,
// or when an error is encountered meaning no location data will be
// available in the forseeable future.
virtual void OnLocationUpdate(const Geoposition& position) = 0;
protected:
GeolocationObserver() {}
virtual ~GeolocationObserver() {}
private:
DISALLOW_COPY_AND_ASSIGN(GeolocationObserver);
};
struct GeolocationObserverOptions {
GeolocationObserverOptions() : use_high_accuracy(false) {}
explicit GeolocationObserverOptions(bool high_accuracy)
: use_high_accuracy(high_accuracy) {}
// Given a map<ANYTHING, GeolocationObserverOptions> this function will
// iterate the map and collapse all the options found to a single instance
// that satisfies them all.
template <typename MAP>
static GeolocationObserverOptions Collapse(const MAP& options_map) {
for (typename MAP::const_iterator it = options_map.begin();
it != options_map.end(); ++it) {
if (it->second.use_high_accuracy)
return GeolocationObserverOptions(true);
}
return GeolocationObserverOptions(false);
}
// Collapse options with another instance so that both are satisfied.
void Collapse(const GeolocationObserverOptions& other) {
use_high_accuracy = use_high_accuracy | other.use_high_accuracy;
}
bool use_high_accuracy;
};
} // namespace content
#endif // CONTENT_BROWSER_GEOLOCATION_GEOLOCATION_OBSERVER_H_
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