1 | /*
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2 | * Copyright 2002-2015 Drew Noakes
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3 | *
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4 | * Licensed under the Apache License, Version 2.0 (the "License");
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5 | * you may not use this file except in compliance with the License.
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6 | * You may obtain a copy of the License at
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7 | *
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8 | * http://www.apache.org/licenses/LICENSE-2.0
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9 | *
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10 | * Unless required by applicable law or agreed to in writing, software
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11 | * distributed under the License is distributed on an "AS IS" BASIS,
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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13 | * See the License for the specific language governing permissions and
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14 | * limitations under the License.
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15 | *
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16 | * More information about this project is available at:
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17 | *
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18 | * https://drewnoakes.com/code/exif/
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19 | * https://github.com/drewnoakes/metadata-extractor
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20 | */
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21 | package com.drew.metadata.exif;
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22 |
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23 | import com.drew.lang.GeoLocation;
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24 | import com.drew.lang.Rational;
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25 | import com.drew.lang.annotations.NotNull;
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26 | import com.drew.lang.annotations.Nullable;
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27 | import com.drew.metadata.TagDescriptor;
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28 |
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29 | import java.text.DecimalFormat;
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30 |
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31 | import static com.drew.metadata.exif.GpsDirectory.*;
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32 |
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33 | /**
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34 | * Provides human-readable string representations of tag values stored in a {@link GpsDirectory}.
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35 | *
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36 | * @author Drew Noakes https://drewnoakes.com
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37 | */
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38 | public class GpsDescriptor extends TagDescriptor<GpsDirectory>
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39 | {
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40 | public GpsDescriptor(@NotNull GpsDirectory directory)
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41 | {
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42 | super(directory);
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43 | }
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44 |
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45 | @Override
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46 | @Nullable
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47 | public String getDescription(int tagType)
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48 | {
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49 | switch (tagType) {
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50 | case TAG_VERSION_ID:
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51 | return getGpsVersionIdDescription();
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52 | case TAG_ALTITUDE:
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53 | return getGpsAltitudeDescription();
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54 | case TAG_ALTITUDE_REF:
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55 | return getGpsAltitudeRefDescription();
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56 | case TAG_STATUS:
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57 | return getGpsStatusDescription();
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58 | case TAG_MEASURE_MODE:
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59 | return getGpsMeasureModeDescription();
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60 | case TAG_SPEED_REF:
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61 | return getGpsSpeedRefDescription();
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62 | case TAG_TRACK_REF:
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63 | case TAG_IMG_DIRECTION_REF:
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64 | case TAG_DEST_BEARING_REF:
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65 | return getGpsDirectionReferenceDescription(tagType);
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66 | case TAG_TRACK:
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67 | case TAG_IMG_DIRECTION:
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68 | case TAG_DEST_BEARING:
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69 | return getGpsDirectionDescription(tagType);
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70 | case TAG_DEST_DISTANCE_REF:
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71 | return getGpsDestinationReferenceDescription();
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72 | case TAG_TIME_STAMP:
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73 | return getGpsTimeStampDescription();
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74 | case TAG_LONGITUDE:
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75 | // three rational numbers -- displayed in HH"MM"SS.ss
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76 | return getGpsLongitudeDescription();
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77 | case TAG_LATITUDE:
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78 | // three rational numbers -- displayed in HH"MM"SS.ss
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79 | return getGpsLatitudeDescription();
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80 | case TAG_DIFFERENTIAL:
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81 | return getGpsDifferentialDescription();
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82 | default:
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83 | return super.getDescription(tagType);
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84 | }
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85 | }
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86 |
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87 | @Nullable
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88 | private String getGpsVersionIdDescription()
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89 | {
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90 | return getVersionBytesDescription(TAG_VERSION_ID, 1);
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91 | }
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92 |
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93 | @Nullable
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94 | public String getGpsLatitudeDescription()
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95 | {
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96 | GeoLocation location = _directory.getGeoLocation();
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97 | return location == null ? null : GeoLocation.decimalToDegreesMinutesSecondsString(location.getLatitude());
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98 | }
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99 |
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100 | @Nullable
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101 | public String getGpsLongitudeDescription()
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102 | {
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103 | GeoLocation location = _directory.getGeoLocation();
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104 | return location == null ? null : GeoLocation.decimalToDegreesMinutesSecondsString(location.getLongitude());
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105 | }
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106 |
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107 | @Nullable
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108 | public String getGpsTimeStampDescription()
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109 | {
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110 | // time in hour, min, sec
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111 | int[] timeComponents = _directory.getIntArray(TAG_TIME_STAMP);
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112 | return timeComponents == null ? null : String.format("%d:%d:%d UTC", timeComponents[0], timeComponents[1], timeComponents[2]);
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113 | }
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114 |
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115 | @Nullable
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116 | public String getGpsDestinationReferenceDescription()
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117 | {
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118 | final String value = _directory.getString(TAG_DEST_DISTANCE_REF);
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119 | if (value == null)
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120 | return null;
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121 | String distanceRef = value.trim();
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122 | if ("K".equalsIgnoreCase(distanceRef)) {
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123 | return "kilometers";
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124 | } else if ("M".equalsIgnoreCase(distanceRef)) {
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125 | return "miles";
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126 | } else if ("N".equalsIgnoreCase(distanceRef)) {
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127 | return "knots";
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128 | } else {
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129 | return "Unknown (" + distanceRef + ")";
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130 | }
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131 | }
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132 |
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133 | @Nullable
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134 | public String getGpsDirectionDescription(int tagType)
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135 | {
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136 | Rational angle = _directory.getRational(tagType);
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137 | // provide a decimal version of rational numbers in the description, to avoid strings like "35334/199 degrees"
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138 | String value = angle != null
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139 | ? new DecimalFormat("0.##").format(angle.doubleValue())
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140 | : _directory.getString(tagType);
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141 | return value == null || value.trim().length() == 0 ? null : value.trim() + " degrees";
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142 | }
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143 |
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144 | @Nullable
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145 | public String getGpsDirectionReferenceDescription(int tagType)
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146 | {
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147 | final String value = _directory.getString(tagType);
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148 | if (value == null)
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149 | return null;
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150 | String gpsDistRef = value.trim();
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151 | if ("T".equalsIgnoreCase(gpsDistRef)) {
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152 | return "True direction";
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153 | } else if ("M".equalsIgnoreCase(gpsDistRef)) {
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154 | return "Magnetic direction";
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155 | } else {
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156 | return "Unknown (" + gpsDistRef + ")";
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157 | }
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158 | }
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159 |
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160 | @Nullable
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161 | public String getGpsSpeedRefDescription()
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162 | {
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163 | final String value = _directory.getString(TAG_SPEED_REF);
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164 | if (value == null)
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165 | return null;
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166 | String gpsSpeedRef = value.trim();
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167 | if ("K".equalsIgnoreCase(gpsSpeedRef)) {
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168 | return "kph";
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169 | } else if ("M".equalsIgnoreCase(gpsSpeedRef)) {
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170 | return "mph";
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171 | } else if ("N".equalsIgnoreCase(gpsSpeedRef)) {
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172 | return "knots";
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173 | } else {
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174 | return "Unknown (" + gpsSpeedRef + ")";
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175 | }
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176 | }
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177 |
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178 | @Nullable
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179 | public String getGpsMeasureModeDescription()
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180 | {
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181 | final String value = _directory.getString(TAG_MEASURE_MODE);
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182 | if (value == null)
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183 | return null;
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184 | String gpsSpeedMeasureMode = value.trim();
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185 | if ("2".equalsIgnoreCase(gpsSpeedMeasureMode)) {
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186 | return "2-dimensional measurement";
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187 | } else if ("3".equalsIgnoreCase(gpsSpeedMeasureMode)) {
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188 | return "3-dimensional measurement";
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189 | } else {
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190 | return "Unknown (" + gpsSpeedMeasureMode + ")";
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191 | }
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192 | }
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193 |
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194 | @Nullable
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195 | public String getGpsStatusDescription()
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196 | {
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197 | final String value = _directory.getString(TAG_STATUS);
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198 | if (value == null)
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199 | return null;
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200 | String gpsStatus = value.trim();
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201 | if ("A".equalsIgnoreCase(gpsStatus)) {
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202 | return "Active (Measurement in progress)";
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203 | } else if ("V".equalsIgnoreCase(gpsStatus)) {
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204 | return "Void (Measurement Interoperability)";
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205 | } else {
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206 | return "Unknown (" + gpsStatus + ")";
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207 | }
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208 | }
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209 |
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210 | @Nullable
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211 | public String getGpsAltitudeRefDescription()
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212 | {
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213 | return getIndexedDescription(TAG_ALTITUDE_REF, "Sea level", "Below sea level");
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214 | }
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215 |
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216 | @Nullable
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217 | public String getGpsAltitudeDescription()
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218 | {
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219 | final Rational value = _directory.getRational(TAG_ALTITUDE);
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220 | return value == null ? null : value.intValue() + " metres";
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221 | }
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222 |
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223 | @Nullable
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224 | public String getGpsDifferentialDescription()
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225 | {
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226 | return getIndexedDescription(TAG_DIFFERENTIAL, "No Correction", "Differential Corrected");
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227 | }
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228 |
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229 | @Nullable
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230 | public String getDegreesMinutesSecondsDescription()
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231 | {
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232 | GeoLocation location = _directory.getGeoLocation();
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233 | return location == null ? null : location.toDMSString();
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234 | }
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235 | }
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