content/common/geoposition.cc

   1 // Copyright (c) 2010 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/common/geoposition.h"
   6
   7 namespace {
   8 // Sentinel values to mark invalid data. (WebKit carries companion is_valid
   9 // bools for this purpose; we may eventually follow that approach, but
  10 // sentinels worked OK in the Gears code this is based on.)
  11 const double kBadLatitudeLongitude = 200;
  12 // Lowest point on land is at approximately -400 meters.
  13 const int kBadAltitude = -10000;
  14 const int kBadAccuracy = -1;  // Accuracy must be non-negative.
  15 const int64 kBadTimestamp = kint64min;
  16 const int kBadHeading = -1;  // Heading must be non-negative.
  17 const int kBadSpeed = -1;
  18 }
  19
  20 Geoposition::Geoposition()
  21     : latitude(kBadLatitudeLongitude),
  22       longitude(kBadLatitudeLongitude),
  23       altitude(kBadAltitude),
  24       accuracy(kBadAccuracy),
  25       altitude_accuracy(kBadAccuracy),
  26       heading(kBadHeading),
  27       speed(kBadSpeed),
  28       error_code(ERROR_CODE_NONE) {
  29 }
  30
  31 bool Geoposition::is_valid_latlong() const {
  32   return latitude >= -90.0 && latitude <= 90.0 &&
  33          longitude >= -180.0 && longitude <= 180.0;
  34 }
  35
  36 bool Geoposition::is_valid_altitude() const {
  37   return altitude > kBadAltitude;
  38 }
  39
  40 bool Geoposition::is_valid_accuracy() const {
  41   return accuracy >= 0.0;
  42 }
  43
  44 bool Geoposition::is_valid_altitude_accuracy() const {
  45   return altitude_accuracy >= 0.0;
  46 }
  47
  48 bool Geoposition::is_valid_heading() const {
  49   return heading >= 0 && heading <= 360;
  50 }
  51
  52 bool Geoposition::is_valid_speed() const {
  53   return speed >= 0;
  54 }
  55
  56 bool Geoposition::is_valid_timestamp() const {
  57   return !timestamp.is_null();
  58 }
  59
  60 bool Geoposition::IsValidFix() const {
  61   return is_valid_latlong() && is_valid_accuracy() && is_valid_timestamp();
  62 }
  63
  64 bool Geoposition::IsInitialized() const {
  65   return error_code != ERROR_CODE_NONE || IsValidFix();
  66 }