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| import java.time.chrono.JapaneseEra; | |
| import java.time.format.TextStyle; | |
| import java.util.ArrayList; | |
| import java.util.Arrays; | |
| import java.util.LinkedHashMap; | |
| import java.util.List; | |
| import java.util.Locale; | |
| import java.util.Map; | |
| import java.util.Objects; | |
| import org.apache.commons.lang3.ArrayUtils; | |
| import org.apache.commons.lang3.ObjectUtils; | |
| import org.apache.commons.lang3.StringUtils; | |
| import com.google.common.base.Stopwatch; | |
| public class JapaneseEraToLigature { | |
| private static Map<JapaneseEra, Character> MAP = null; | |
| private static char[] SQUARE_ERA_NAME_CHARACTERS = null; | |
| public static void main(final String[] args) { | |
| // | |
| final JapaneseEra[] jes = JapaneseEra.values(); | |
| // | |
| final int maxDisplayNameLength = Arrays.stream(JapaneseEra.values()) | |
| .mapToInt(x -> StringUtils.length(x.getDisplayName(TextStyle.FULL, Locale.ENGLISH))).max().orElse(0); | |
| // | |
| final Stopwatch stopWatch = Stopwatch.createStarted(); | |
| // | |
| Arrays.stream(jes).forEachOrdered(je -> { | |
| System.out.println(StringUtils.rightPad(Objects.toString(je), maxDisplayNameLength) + " " + toLigature(je)); | |
| }); | |
| // | |
| System.out.println(stopWatch.elapsed()); | |
| // | |
| stopWatch.reset().start(); | |
| // | |
| Arrays.stream(jes).forEachOrdered(je -> { | |
| System.out.println(StringUtils.rightPad(Objects.toString(je), maxDisplayNameLength) + " " + toLigature(je)); | |
| }); | |
| // | |
| System.out.println(stopWatch.elapsed()); | |
| // | |
| } | |
| private static Character toLigature(final JapaneseEra je) { | |
| // | |
| if (MAP == null) { | |
| // | |
| MAP = new LinkedHashMap<>(); | |
| // | |
| } // if | |
| // | |
| if (MAP.containsKey(je)) { | |
| // | |
| return MAP.get(je); | |
| // | |
| } // if | |
| // | |
| Character c = null; | |
| // | |
| if (SQUARE_ERA_NAME_CHARACTERS == null) { | |
| // | |
| List<Character> cs = null; | |
| // | |
| for (int i = Character.MIN_CODE_POINT; i <= Character.MAX_CODE_POINT; i++) { | |
| // | |
| if (!StringUtils.startsWith(Character.getName(i), "SQUARE ERA NAME") | |
| || (cs = ObjectUtils.getIfNull(cs, ArrayList::new)) == null) { | |
| // | |
| continue; | |
| // | |
| } // if | |
| // | |
| if (!cs.contains(c = Character.valueOf((char) i))) { | |
| // | |
| cs.add(c); | |
| // | |
| } // if | |
| // | |
| } // for | |
| // | |
| SQUARE_ERA_NAME_CHARACTERS = ArrayUtils.toPrimitive(cs.toArray(new Character[cs.size()])); | |
| // | |
| } // if | |
| // | |
| Map<JapaneseEra, Integer> jeMap = null; | |
| // | |
| for (int i = 0; SQUARE_ERA_NAME_CHARACTERS != null && i < SQUARE_ERA_NAME_CHARACTERS.length; i++) { | |
| // | |
| if (StringUtils | |
| .isBlank(StringUtils.getCommonPrefix( | |
| StringUtils.trim(StringUtils.substringAfter( | |
| Character.getName((int) SQUARE_ERA_NAME_CHARACTERS[i]), "SQUARE ERA NAME")), | |
| StringUtils.upperCase(je.getDisplayName(TextStyle.FULL, Locale.ENGLISH)))) | |
| || (jeMap = ObjectUtils.getIfNull(jeMap, LinkedHashMap::new)) == null) { | |
| // | |
| continue; | |
| // | |
| } // if | |
| // | |
| if (!jeMap.containsKey(je)) { | |
| // | |
| jeMap.put(je, (int) SQUARE_ERA_NAME_CHARACTERS[i]); | |
| // | |
| } // if | |
| // | |
| } // for | |
| // | |
| if (jeMap == null) { | |
| // | |
| for (int i = Character.MIN_CODE_POINT; i <= Character.MAX_CODE_POINT; i++) { | |
| // | |
| if (StringUtils | |
| .isBlank(StringUtils.getCommonPrefix( | |
| StringUtils.trim(StringUtils.substringAfter(Character.getName(i), "SQUARE ERA NAME")), | |
| StringUtils.upperCase(je.getDisplayName(TextStyle.FULL, Locale.ENGLISH)))) | |
| || (jeMap = ObjectUtils.getIfNull(jeMap, LinkedHashMap::new)) == null) { | |
| // | |
| continue; | |
| // | |
| } // if | |
| // | |
| if (!jeMap.containsKey(je)) { | |
| // | |
| jeMap.put(je, Integer.valueOf(i)); | |
| // | |
| } // if | |
| // | |
| } // for | |
| // | |
| } // if | |
| // | |
| if (jeMap == null || jeMap.isEmpty()) { | |
| // | |
| return null; | |
| // | |
| } else if (jeMap.size() > 1) { | |
| // | |
| throw new IllegalStateException(); | |
| // | |
| } // if | |
| // | |
| MAP.put(je, c = Character.valueOf((char) (new ArrayList<Integer>(jeMap.values()).get(0)).intValue())); | |
| // | |
| return c; | |
| // | |
| } | |
| } |
Purpose / 目的
Convert a Japanese Era into corresponding ligature
日本の年号を対応する合字に変換する
Reference
https://en.wikipedia.org/wiki/Ligature_(writing)
https://en.wikipedia.org/wiki/Japanese_era_name
Certain era names have specific characters assigned to them, for instance ㋿ for the Reiwa period, which can also be written as 令和. These are included in Unicode: Code points U+32FF (㋿), U+337B (㍻), U+337C (㍼), U+337D (㍽) and U+337E (㍾) are used for the Reiwa, Heisei, Shōwa, Taishō and Meiji eras, respectively.
https://ja.wikipedia.org/wiki/%E5%85%83%E5%8F%B7%E4%B8%80%E8%A6%A7_(%E6%97%A5%E6%9C%AC)
Output Sample
Meiji ㍾ Taisho ㍽ Showa ㍼ Heisei ㍻ Reiwa ㋿ PT0.4362886S Meiji ㍾ Taisho ㍽ Showa ㍼ Heisei ㍻ Reiwa ㋿ PT0.002274S
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