content/browser/geolocation/location_api_adapter_android.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/browser/geolocation/location_api_adapter_android.h"
   6
   7 #include "base/android/jni_android.h"
   8 #include "base/android/jni_string.h"
   9 #include "base/bind.h"
  10 #include "base/location.h"
  11 #include "content/browser/geolocation/location_provider_android.h"
  12 #include "jni/LocationProvider_jni.h"
  13
  14 using base::android::AttachCurrentThread;
  15 using base::android::CheckException;
  16 using base::android::ClearException;
  17 using content::AndroidLocationApiAdapter;
  18
  19 static void NewLocationAvailable(JNIEnv* env, jclass,
  20                                  jdouble latitude,
  21                                  jdouble longitude,
  22                                  jdouble time_stamp,
  23                                  jboolean has_altitude, jdouble altitude,
  24                                  jboolean has_accuracy, jdouble accuracy,
  25                                  jboolean has_heading, jdouble heading,
  26                                  jboolean has_speed, jdouble speed) {
  27   AndroidLocationApiAdapter::OnNewLocationAvailable(latitude, longitude,
  28       time_stamp, has_altitude, altitude, has_accuracy, accuracy,
  29       has_heading, heading, has_speed, speed);
  30 }
  31
  32 static void NewErrorAvailable(JNIEnv* env, jclass, jstring message) {
  33   AndroidLocationApiAdapter::OnNewErrorAvailable(env, message);
  34 }
  35
  36 namespace content {
  37
  38 AndroidLocationApiAdapter::AndroidLocationApiAdapter()
  39     : location_provider_(NULL) {
  40 }
  41
  42 AndroidLocationApiAdapter::~AndroidLocationApiAdapter() {
  43   CHECK(!location_provider_);
  44   CHECK(!message_loop_);
  45   CHECK(java_location_provider_android_object_.is_null());
  46 }
  47
  48 bool AndroidLocationApiAdapter::Start(
  49     LocationProviderAndroid* location_provider, bool high_accuracy) {
  50   JNIEnv* env = AttachCurrentThread();
  51   if (!location_provider_) {
  52     location_provider_ = location_provider;
  53     CHECK(java_location_provider_android_object_.is_null());
  54     CreateJavaObject(env);
  55     {
  56       base::AutoLock lock(lock_);
  57       CHECK(!message_loop_.get());
  58       message_loop_ = base::MessageLoopProxy::current();
  59     }
  60   }
  61   // At this point we should have all our pre-conditions ready, and they'd only
  62   // change in Stop() which must be called on the same thread as here.
  63   CHECK(location_provider_);
  64   CHECK(message_loop_.get());
  65   CHECK(!java_location_provider_android_object_.is_null());
  66   // We'll start receiving notifications from java in the main thread looper
  67   // until Stop() is called.
  68   return Java_LocationProvider_start(env,
  69       java_location_provider_android_object_.obj(), high_accuracy);
  70 }
  71
  72 void AndroidLocationApiAdapter::Stop() {
  73   if (!location_provider_) {
  74     CHECK(!message_loop_.get());
  75     CHECK(java_location_provider_android_object_.is_null());
  76     return;
  77   }
  78
  79   {
  80     base::AutoLock lock(lock_);
  81     message_loop_ = NULL;
  82   }
  83
  84   location_provider_ = NULL;
  85
  86   JNIEnv* env = AttachCurrentThread();
  87   Java_LocationProvider_stop(env, java_location_provider_android_object_.obj());
  88   java_location_provider_android_object_.Reset();
  89 }
  90
  91 // static
  92 void AndroidLocationApiAdapter::NotifyProviderNewGeoposition(
  93     const Geoposition& geoposition) {
  94   // Called on the geolocation thread, safe to access location_provider_ here.
  95   if (GetInstance()->location_provider_) {
  96     CHECK(GetInstance()->message_loop_->BelongsToCurrentThread());
  97     GetInstance()->location_provider_->NotifyNewGeoposition(geoposition);
  98   }
  99 }
 100
 101 // static
 102 void AndroidLocationApiAdapter::OnNewLocationAvailable(
 103     double latitude, double longitude, double time_stamp,
 104     bool has_altitude, double altitude,
 105     bool has_accuracy, double accuracy,
 106     bool has_heading, double heading,
 107     bool has_speed, double speed) {
 108   Geoposition position;
 109   position.latitude = latitude;
 110   position.longitude = longitude;
 111   position.timestamp = base::Time::FromDoubleT(time_stamp);
 112   if (has_altitude)
 113     position.altitude = altitude;
 114   if (has_accuracy)
 115     position.accuracy = accuracy;
 116   if (has_heading)
 117     position.heading = heading;
 118   if (has_speed)
 119     position.speed = speed;
 120   GetInstance()->OnNewGeopositionInternal(position);
 121 }
 122
 123 // static
 124 void AndroidLocationApiAdapter::OnNewErrorAvailable(JNIEnv* env,
 125                                                     jstring message) {
 126   Geoposition position_error;
 127   position_error.error_code = Geoposition::ERROR_CODE_POSITION_UNAVAILABLE;
 128   position_error.error_message =
 129       base::android::ConvertJavaStringToUTF8(env, message);
 130   GetInstance()->OnNewGeopositionInternal(position_error);
 131 }
 132
 133 // static
 134 AndroidLocationApiAdapter* AndroidLocationApiAdapter::GetInstance() {
 135   return Singleton<AndroidLocationApiAdapter>::get();
 136 }
 137
 138 // static
 139 bool AndroidLocationApiAdapter::RegisterGeolocationService(JNIEnv* env) {
 140   return RegisterNativesImpl(env);
 141 }
 142
 143 void AndroidLocationApiAdapter::CreateJavaObject(JNIEnv* env) {
 144   // Create the Java AndroidLocationProvider object.
 145   java_location_provider_android_object_.Reset(
 146       Java_LocationProvider_create(env,
 147           base::android::GetApplicationContext()));
 148   CHECK(!java_location_provider_android_object_.is_null());
 149 }
 150
 151 void AndroidLocationApiAdapter::OnNewGeopositionInternal(
 152     const Geoposition& geoposition) {
 153   base::AutoLock lock(lock_);
 154   if (!message_loop_)
 155     return;
 156   message_loop_->PostTask(
 157       FROM_HERE,
 158       base::Bind(
 159           &AndroidLocationApiAdapter::NotifyProviderNewGeoposition,
 160           geoposition));
 161 }
 162
 163 }  // namespace content