161 if (i == index || !exists(names, i)) {
162 names[i] = compatNames[i];
163 }
164 }
165 return;
166 }
167 }
168
169 // Type Fallback
170 if (noDST && typeFallback(names, index)) {
171 return;
172 }
173
174 // Region Fallback
175 if (regionFormatFallback(names, index, locale)) {
176 return;
177 }
178
179 // last resort
180 String id = names[INDEX_TZID].toUpperCase(Locale.ROOT);
181 if (!id.startsWith("ETC/GMT") &&
182 !id.startsWith("GMT") &&
183 !id.startsWith("UT")) {
184 names[index] = toGMTFormat(names[INDEX_TZID],
185 index == INDEX_DST_LONG || index == INDEX_DST_SHORT,
186 index % 2 != 0,
187 locale);
188 }
189 }
190
191 private boolean exists(String[] names, int index) {
192 return Objects.nonNull(names)
193 && Objects.nonNull(names[index])
194 && !names[index].isEmpty();
195 }
196
197 private boolean typeFallback(String[] names, int index) {
198 // check generic
199 int genIndex = INDEX_GEN_SHORT - index % 2;
200 if (!exists(names, index) && exists(names, genIndex)) {
201 names[index] = names[genIndex];
202 } else {
203 // check standard
204 int stdIndex = INDEX_STD_SHORT - index % 2;
205 if (!exists(names, index) && exists(names, stdIndex)) {
206 names[index] = names[stdIndex];
207 }
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161 if (i == index || !exists(names, i)) {
162 names[i] = compatNames[i];
163 }
164 }
165 return;
166 }
167 }
168
169 // Type Fallback
170 if (noDST && typeFallback(names, index)) {
171 return;
172 }
173
174 // Region Fallback
175 if (regionFormatFallback(names, index, locale)) {
176 return;
177 }
178
179 // last resort
180 String id = names[INDEX_TZID].toUpperCase(Locale.ROOT);
181 if (!id.startsWith("UT")) {
182 names[index] = toGMTFormat(names[INDEX_TZID],
183 index == INDEX_DST_LONG || index == INDEX_DST_SHORT,
184 index % 2 != 0,
185 locale);
186 // aliases of "GMT" timezone.
187 if ((exists(names, INDEX_STD_LONG)) && (id.startsWith("Etc/")
188 || id.startsWith("GMT") || id.startsWith("Greenwich"))) {
189 switch (id) {
190 case "Etc/GMT":
191 case "Etc/GMT-0":
192 case "Etc/GMT+0":
193 case "Etc/GMT0":
194 case "GMT+0":
195 case "GMT-0":
196 case "GMT0":
197 case "Greenwich":
198 names[INDEX_DST_LONG] = names[INDEX_GEN_LONG] = names[INDEX_STD_LONG];
199 break;
200 }
201 }
202 }
203 }
204
205 private boolean exists(String[] names, int index) {
206 return Objects.nonNull(names)
207 && Objects.nonNull(names[index])
208 && !names[index].isEmpty();
209 }
210
211 private boolean typeFallback(String[] names, int index) {
212 // check generic
213 int genIndex = INDEX_GEN_SHORT - index % 2;
214 if (!exists(names, index) && exists(names, genIndex)) {
215 names[index] = names[genIndex];
216 } else {
217 // check standard
218 int stdIndex = INDEX_STD_SHORT - index % 2;
219 if (!exists(names, index) && exists(names, stdIndex)) {
220 names[index] = names[stdIndex];
221 }
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