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/*
* Copyright 2009, 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:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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 THE COPYRIGHT HOLDERS ``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 THE COPYRIGHT OWNER 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.
*/
#include "config.h"
#include "GeolocationServiceAndroid.h"
#include "Geolocation.h"
#include "GeolocationServiceBridge.h"
#include "Geoposition.h"
#include "PositionError.h"
#include "PositionOptions.h"
#if PLATFORM(ANDROID)
// Required for sim-eng build
#include <math.h>
#endif
#include <wtf/CurrentTime.h>
using JSC::Bindings::getJNIEnv;
using namespace std;
namespace WebCore {
// GeolocationServiceAndroid is the Android implmentation of Geolocation
// service. Each object of this class owns an object of type
// GeolocationServiceBridge, which in turn owns a Java GeolocationService
// object. Therefore, there is a 1:1 mapping between Geolocation,
// GeolocationServiceAndroid, GeolocationServiceBridge and Java
// GeolocationService objects. In the case where multiple Geolocation objects
// exist simultaneously, the corresponsing Java GeolocationService objects all
// register with the platform location service. It is the platform service that
// handles making sure that updates are passed to all Geolocation objects.
GeolocationService* GeolocationServiceAndroid::create(GeolocationServiceClient* client)
{
return new GeolocationServiceAndroid(client);
}
GeolocationService::FactoryFunction* GeolocationService::s_factoryFunction = &GeolocationServiceAndroid::create;
GeolocationServiceAndroid::GeolocationServiceAndroid(GeolocationServiceClient* client)
: GeolocationService(client)
, m_timer(this, &GeolocationServiceAndroid::timerFired)
, m_javaBridge(0)
{
}
// ANDROID
// TODO: Upstream to webkit.org. See https://bugs.webkit.org/show_bug.cgi?id=34082
bool GeolocationServiceAndroid::startUpdating(PositionOptions* options, bool suspend)
{
// ANDROID
// This is an ugly hack. A correct fix would require a change to WebCore,
// but this isn't worth the effort as we're in the process of switching to a
// client-based implementation. See https://bugs.webkit.org/show_bug.cgi?id=40373
Frame* frame = reinterpret_cast<Geolocation*>(geolocationServiceClient())->frame();
if (!frame)
return false;
// This method is called every time a new watch or one-shot position request
// is started. If we already have a position or an error, call back
// immediately.
if (m_lastPosition || m_lastError) {
ASSERT(m_javaBridge);
m_timer.startOneShot(0);
}
// Lazilly create the Java object.
bool haveJavaBridge = m_javaBridge;
if (!haveJavaBridge)
m_javaBridge.set(new GeolocationServiceBridge(this, frame));
ASSERT(m_javaBridge);
// On Android, high power == GPS. Set whether to use GPS before we start the
// implementation.
ASSERT(options);
if (options->enableHighAccuracy())
m_javaBridge->setEnableGps(true);
// We need only start the service when it's first created.
if (!haveJavaBridge) {
// If the browser is paused, don't start the service. It will be started
// when we get the call to resume.
// ANDROID
// TODO: Upstream to webkit.org. See https://bugs.webkit.org/show_bug.cgi?id=34082
if (!suspend)
return m_javaBridge->start();
}
return true;
}
void GeolocationServiceAndroid::stopUpdating()
{
// Called when the Geolocation object has no watches or one shots in
// progress. This may be called repeatedly.
m_javaBridge.clear();
// Reset last position and error to make sure that we always try to get a
// new position from the system service when a request is first made.
m_lastPosition = 0;
m_lastError = 0;
// remove the pending timer
if (m_timer.isActive())
m_timer.stop();
}
void GeolocationServiceAndroid::suspend()
{
if (m_javaBridge)
m_javaBridge->stop();
}
void GeolocationServiceAndroid::resume()
{
if (m_javaBridge)
m_javaBridge->start();
}
// Note that there is no guarantee that subsequent calls to this method offer a
// more accurate or updated position.
void GeolocationServiceAndroid::newPositionAvailable(PassRefPtr<Geoposition> position)
{
ASSERT(position);
if (!m_lastPosition
|| isPositionMovement(m_lastPosition.get(), position.get())
|| isPositionMoreAccurate(m_lastPosition.get(), position.get())
|| isPositionMoreTimely(m_lastPosition.get(), position.get())) {
m_lastPosition = position;
// Remove the last error.
m_lastError = 0;
positionChanged();
}
}
void GeolocationServiceAndroid::newErrorAvailable(PassRefPtr<PositionError> error)
{
ASSERT(error);
// We leave the last position
m_lastError = error;
errorOccurred();
}
void GeolocationServiceAndroid::timerFired(Timer<GeolocationServiceAndroid>* timer)
{
ASSERT(&m_timer == timer);
ASSERT(m_lastPosition || m_lastError);
if (m_lastPosition)
positionChanged();
else if (m_lastError)
errorOccurred();
}
bool GeolocationServiceAndroid::isPositionMovement(Geoposition* position1, Geoposition* position2)
{
ASSERT(position1 && position2);
// For the small distances in which we are likely concerned, it's reasonable
// to approximate the distance between the two positions as the sum of the
// differences in latitude and longitude.
double delta = fabs(position1->coords()->latitude() - position2->coords()->latitude())
+ fabs(position1->coords()->longitude() - position2->coords()->longitude());
// Approximate conversion from degrees of arc to metres.
delta *= 60 * 1852;
// The threshold is when the distance between the two positions exceeds the
// worse (larger) of the two accuracies.
int maxAccuracy = max(position1->coords()->accuracy(), position2->coords()->accuracy());
return delta > maxAccuracy;
}
bool GeolocationServiceAndroid::isPositionMoreAccurate(Geoposition* position1, Geoposition* position2)
{
ASSERT(position1 && position2);
return position2->coords()->accuracy() < position1->coords()->accuracy();
}
bool GeolocationServiceAndroid::isPositionMoreTimely(Geoposition* position1, Geoposition* position2)
{
ASSERT(position1 && position2);
DOMTimeStamp currentTimeMillis = WTF::currentTime() * 1000.0;
DOMTimeStamp maximumAgeMillis = 10 * 60 * 1000; // 10 minutes
return currentTimeMillis - position1->timestamp() > maximumAgeMillis;
}
} // namespace WebCore
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