text: // Copyright (c) 2011 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_NETWORK_LOCATION_REQUEST_H_
  #define CONTENT_BROWSER_GEOLOCATION_NETWORK_LOCATION_REQUEST_H_
  #pragma once
  
  #include <string>
  
  #include "base/basictypes.h"
  #include "base/memory/ref_counted.h"
  #include "base/memory/scoped_ptr.h"
  #include "content/browser/geolocation/device_data_provider.h"
  #include "content/common/content_export.h"
  #include "content/public/common/url_fetcher_delegate.h"
  #include "googleurl/src/gurl.h"
  
  struct Geoposition;
  class URLFetcher;
  
  namespace net {
  class URLRequestContextGetter;
  }
  
  // Takes a set of device data and sends it to a server to get a position fix.
  // It performs formatting of the request and interpretation of the response.
  class NetworkLocationRequest : private content::URLFetcherDelegate {
   public:
    // ID passed to URLFetcher::Create(). Used for testing.
    CONTENT_EXPORT static int url_fetcher_id_for_tests;
    // Interface for receiving callbacks from a NetworkLocationRequest object.
    class ListenerInterface {
     public:
      // Updates the listener with a new position. server_error indicates whether
      // was a server or network error - either no response or a 500 error code.
      virtual void LocationResponseAvailable(
          const Geoposition& position,
          bool server_error,
          const string16& access_token,
          const RadioData& radio_data,
          const WifiData& wifi_data) = 0;
  
     protected:
      virtual ~ListenerInterface() {}
    };
  
    // |url| is the server address to which the request wil be sent.
    NetworkLocationRequest(net::URLRequestContextGetter* context,
                           const GURL& url,
                           ListenerInterface* listener);
    virtual ~NetworkLocationRequest();
  
    // Makes a new request. Returns true if the new request was successfully
    // started. In all cases, any currently pending request will be canceled.
    bool MakeRequest(const std::string& host,
                     const string16& access_token,
                     const RadioData& radio_data,
                     const WifiData& wifi_data,
                     const base::Time& timestamp);
  
    bool is_request_pending() const { return url_fetcher_ != NULL; }
    const GURL& url() const { return url_; }
  
   private:
    // content::URLFetcherDelegate
    virtual void OnURLFetchComplete(const content::URLFetcher* source) OVERRIDE;
  
    scoped_refptr<net::URLRequestContextGetter> url_context_;
    ListenerInterface* listener_;
    const GURL url_;
    scoped_ptr<content::URLFetcher> url_fetcher_;
  
    // Keep a copy of the data sent in the request, so we can refer back to it
    // when the response arrives.
    RadioData radio_data_;
    WifiData wifi_data_;
    base::Time timestamp_;  // Timestamp of the above data, not of the request.
  
    DISALLOW_COPY_AND_ASSIGN(NetworkLocationRequest);
  };
  
  #endif  // CONTENT_BROWSER_GEOLOCATION_NETWORK_LOCATION_REQUEST_H_
  