chromeos/geolocation/simple_geolocation_provider.cc

   1 // Copyright 2014 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 "chromeos/geolocation/simple_geolocation_provider.h"
   6
   7 #include <algorithm>
   8 #include <iterator>
   9
  10 #include "base/bind.h"
  11 #include "chromeos/geolocation/geoposition.h"
  12 #include "net/url_request/url_request_context_getter.h"
  13
  14 namespace chromeos {
  15
  16 namespace {
  17 const char kDefaultGeolocationProviderUrl[] =
  18     "https://www.googleapis.com/geolocation/v1/geolocate?";
  19 }  // namespace
  20
  21 SimpleGeolocationProvider::SimpleGeolocationProvider(
  22     net::URLRequestContextGetter* url_context_getter,
  23     const GURL& url)
  24     : url_context_getter_(url_context_getter), url_(url) {
  25 }
  26
  27 SimpleGeolocationProvider::~SimpleGeolocationProvider() {
  28   DCHECK(thread_checker_.CalledOnValidThread());
  29 }
  30
  31 void SimpleGeolocationProvider::RequestGeolocation(
  32     base::TimeDelta timeout,
  33     SimpleGeolocationRequest::ResponseCallback callback) {
  34   DCHECK(thread_checker_.CalledOnValidThread());
  35   SimpleGeolocationRequest* request(
  36       new SimpleGeolocationRequest(url_context_getter_.get(), url_, timeout));
  37   requests_.push_back(request);
  38
  39   // SimpleGeolocationProvider owns all requests. It is safe to pass unretained
  40   // "this" because destruction of SimpleGeolocationProvider cancels all
  41   // requests.
  42   SimpleGeolocationRequest::ResponseCallback callback_tmp(
  43       base::Bind(&SimpleGeolocationProvider::OnGeolocationResponse,
  44                  base::Unretained(this),
  45                  request,
  46                  callback));
  47   request->MakeRequest(callback_tmp);
  48 }
  49
  50 // static
  51 GURL SimpleGeolocationProvider::DefaultGeolocationProviderURL() {
  52   return GURL(kDefaultGeolocationProviderUrl);
  53 }
  54
  55 void SimpleGeolocationProvider::OnGeolocationResponse(
  56     SimpleGeolocationRequest* request,
  57     SimpleGeolocationRequest::ResponseCallback callback,
  58     const Geoposition& geoposition,
  59     bool server_error,
  60     const base::TimeDelta elapsed) {
  61   DCHECK(thread_checker_.CalledOnValidThread());
  62
  63   callback.Run(geoposition, server_error, elapsed);
  64
  65   ScopedVector<SimpleGeolocationRequest>::iterator position =
  66       std::find(requests_.begin(), requests_.end(), request);
  67   DCHECK(position != requests_.end());
  68   if (position != requests_.end()) {
  69     std::swap(*position, *requests_.rbegin());
  70     requests_.resize(requests_.size() - 1);
  71   }
  72 }
  73
  74 }  // namespace chromeos