Geolocation.h   [plain text]

/*
 * Copyright (C) 2008, 2009 Apple Inc. All Rights Reserved.
 * Copyright 2010, The Android Open Source Project
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#ifndef Geolocation_h
#define Geolocation_h

#include "GeolocationPositionCache.h"
#include "PositionCallback.h"
#include "PositionError.h"
#include "PositionErrorCallback.h"
#include "PositionOptions.h"
#include "Timer.h"

#if !ENABLE(CLIENT_BASED_GEOLOCATION)
#include "GeolocationService.h"
#endif

namespace WebCore {

class Frame;
#if ENABLE(CLIENT_BASED_GEOLOCATION)
class GeolocationPosition;
class GeolocationError;
#endif
class Geoposition;
class Page;

class Geolocation : public RefCounted<Geolocation>
#if !ENABLE(CLIENT_BASED_GEOLOCATION) && ENABLE(GEOLOCATION)
    , public GeolocationServiceClient
#endif
{
public:
    static PassRefPtr<Geolocation> create(Frame* frame) { return adoptRef(new Geolocation(frame)); }

    ~Geolocation();

    void reset();
    void disconnectFrame();
    
    void getCurrentPosition(PassRefPtr<PositionCallback>, PassRefPtr<PositionErrorCallback>, PassRefPtr<PositionOptions>);
    int watchPosition(PassRefPtr<PositionCallback>, PassRefPtr<PositionErrorCallback>, PassRefPtr<PositionOptions>);
    void clearWatch(int watchId);

    // These methods are used by Android.
    void suspend();
    void resume();

    void setIsAllowed(bool);
    Frame* frame() const { return m_frame; }

#if ENABLE(CLIENT_BASED_GEOLOCATION)
    void positionChanged();
    void setError(GeolocationError*);
#else
    GeolocationService* getGeolocationService() const { return m_service.get(); }
#endif

private:
    Geoposition* lastPosition();

    bool isAllowed() const { return m_allowGeolocation == Yes; }
    bool isDenied() const { return m_allowGeolocation == No; }
    
    Geolocation(Frame*);

    Page* page() const;

    class GeoNotifier : public RefCounted<GeoNotifier> {
    public:
        static PassRefPtr<GeoNotifier> create(Geolocation* geolocation, PassRefPtr<PositionCallback> positionCallback, PassRefPtr<PositionErrorCallback> positionErrorCallback, PassRefPtr<PositionOptions> options) { return adoptRef(new GeoNotifier(geolocation, positionCallback, positionErrorCallback, options)); }
        
        void setFatalError(PassRefPtr<PositionError>);
        bool hasZeroTimeout() const;
        void setUseCachedPosition();
        void runSuccessCallback(Geoposition*);
        void startTimerIfNeeded();
        void timerFired(Timer<GeoNotifier>*);
        
        RefPtr<Geolocation> m_geolocation;
        RefPtr<PositionCallback> m_successCallback;
        RefPtr<PositionErrorCallback> m_errorCallback;
        RefPtr<PositionOptions> m_options;
        Timer<GeoNotifier> m_timer;
        RefPtr<PositionError> m_fatalError;
        bool m_useCachedPosition;

    private:
        GeoNotifier(Geolocation*, PassRefPtr<PositionCallback>, PassRefPtr<PositionErrorCallback>, PassRefPtr<PositionOptions>);
    };

    typedef Vector<RefPtr<GeoNotifier> > GeoNotifierVector;
    typedef HashSet<RefPtr<GeoNotifier> > GeoNotifierSet;

    class Watchers {
    public:
        void set(int id, PassRefPtr<GeoNotifier>);
        void remove(int id);
        void remove(GeoNotifier*);
        bool contains(GeoNotifier*) const;
        void clear();
        bool isEmpty() const;
        void getNotifiersVector(GeoNotifierVector&) const;
    private:
        typedef HashMap<int, RefPtr<GeoNotifier> > IdToNotifierMap;
        typedef HashMap<RefPtr<GeoNotifier>, int> NotifierToIdMap;
        IdToNotifierMap m_idToNotifierMap;
        NotifierToIdMap m_notifierToIdMap;
    };

    class PositionCacheWrapper {
    public:
        PositionCacheWrapper()
            : m_cache(GeolocationPositionCache::instance())
        {
            m_cache->addUser();
        }
        ~PositionCacheWrapper()
        {
            m_cache->removeUser();
        }
        void setCachedPosition(Geoposition* cachedPosition) { m_cache->setCachedPosition(cachedPosition); }
        Geoposition* cachedPosition() { return m_cache->cachedPosition(); }
    private:
        GeolocationPositionCache* m_cache;
    };

    bool hasListeners() const { return !m_oneShots.isEmpty() || !m_watchers.isEmpty(); }

    void sendError(GeoNotifierVector&, PositionError*);
    void sendPosition(GeoNotifierVector&, Geoposition*);

    static void extractNotifiersWithCachedPosition(GeoNotifierVector& notifiers, GeoNotifierVector* cached);
    static void copyToSet(const GeoNotifierVector&, GeoNotifierSet&);

    static void stopTimer(GeoNotifierVector&);
    void stopTimersForOneShots();
    void stopTimersForWatchers();
    void stopTimers();

    void cancelRequests(GeoNotifierVector&);
    void cancelAllRequests();

    void positionChangedInternal();
    void makeSuccessCallbacks();
    void handleError(PositionError*);

    void requestPermission();

    bool startUpdating(GeoNotifier*);
    void stopUpdating();

#if USE(PREEMPT_GEOLOCATION_PERMISSION)
    void handlePendingPermissionNotifiers();
#endif

#if !ENABLE(CLIENT_BASED_GEOLOCATION) && ENABLE(GEOLOCATION)
    // GeolocationServiceClient
    virtual void geolocationServicePositionChanged(GeolocationService*);
    virtual void geolocationServiceErrorOccurred(GeolocationService*);
#endif

    PassRefPtr<GeoNotifier> startRequest(PassRefPtr<PositionCallback>, PassRefPtr<PositionErrorCallback>, PassRefPtr<PositionOptions>);

    void fatalErrorOccurred(GeoNotifier*);
    void requestTimedOut(GeoNotifier*);
    void requestUsesCachedPosition(GeoNotifier*);
    bool haveSuitableCachedPosition(PositionOptions*);
    void makeCachedPositionCallbacks();

    GeoNotifierSet m_oneShots;
    Watchers m_watchers;
    Frame* m_frame;
#if !ENABLE(CLIENT_BASED_GEOLOCATION)
    OwnPtr<GeolocationService> m_service;
#endif
#if USE(PREEMPT_GEOLOCATION_PERMISSION)
    GeoNotifierSet m_pendingForPermissionNotifiers;
#endif
    RefPtr<Geoposition> m_lastPosition;

    enum {
        Unknown,
        InProgress,
        Yes,
        No
    } m_allowGeolocation;

#if ENABLE(GEOLOCATION)
    PositionCacheWrapper m_positionCache;
#endif
    GeoNotifierSet m_requestsAwaitingCachedPosition;
};
    
} // namespace WebCore

#endif // Geolocation_h