JapaneseDateWesternDateSpreadSheet (Java 24)

JapaneseDateWesternDateSpreadSheet24.java

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.classfile.ClassFile;
import java.lang.classfile.ClassFileElement;
import java.lang.classfile.ClassModel;
import java.lang.classfile.CodeElement;
import java.lang.classfile.CodeModel;
import java.lang.classfile.CompoundElement;
import java.lang.classfile.MethodModel;
import java.lang.classfile.constantpool.ClassEntry;
import java.lang.classfile.constantpool.Utf8Entry;
import java.lang.classfile.instruction.ConstantInstruction.ArgumentConstantInstruction;
import java.lang.classfile.instruction.ConstantInstruction.IntrinsicConstantInstruction;
import java.lang.classfile.instruction.InvokeInstruction;
import java.lang.constant.ConstantDesc;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.time.chrono.JapaneseEra;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Calendar;
import java.util.Collection;
import java.util.Collections;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import java.util.Objects;
import java.util.Optional;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.ObjIntConsumer;
import java.util.function.Predicate;
import java.util.function.ToIntFunction;
import java.util.stream.Stream;

import org.apache.commons.collections4.IterableUtils;
import org.apache.commons.lang3.ObjectUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.function.TriConsumer;
import org.apache.poi.ss.usermodel.AutoFilter;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class JapaneseDateWesternDateSpreadSheet24 {

	private static class YearMonthDay {

		private int year, month, day;

		@Override
		public String toString() {
			//
			final StringBuilder sb = new StringBuilder(StringUtils.leftPad(Integer.toString(year), 4, '0'));
			//
			sb.append(StringUtils.leftPad(Integer.toString(month), 2, '0'));
			//
			return Objects.toString(sb.append(StringUtils.leftPad(Integer.toString(day), 2, '0')));
			//
		}

	}

	public static void main(final String[] args)
			throws IOException, IllegalAccessException, InstantiationException, InvocationTargetException {
		//
		// https://github.com/openjdk/jdk/blob/master/src/java.base/share/classes/java/time/chrono/JapaneseEra.java
		//
		// {Meiji=1868-01-01, Taisho=1912-07-30, Showa=1926-12-25, Heisei=1989-01-08,
		// Reiwa=2019-05-01}
		//
		// Year Month Day 年号
		// 1868 1 1 明治 元 明治元年
		//
		final List<YearMonthDay> japaneseEraSinceDates = getJapaneseEraSinceDates();
		//
		final YearMonthDay firstJapaneseEraSinceDate = Collections.min(japaneseEraSinceDates,
				(a, b) -> compare(Objects.toString(a), Objects.toString(b), -1));
		//
		Calendar calendar = null;
		//
		if (firstJapaneseEraSinceDate != null && (calendar = Calendar.getInstance()) != null) {
			//
			calendar.set(firstJapaneseEraSinceDate.year, firstJapaneseEraSinceDate.month - 1,
					firstJapaneseEraSinceDate.day, 0, 0, 0);
			//
			calendar.set(Calendar.MILLISECOND, 0);
			//
		} // if
			//
		final Calendar now = Calendar.getInstance();
		//
		List<Date> dates = null;
		//
		while (calendar != null && ObjectUtils.compare(calendar, now) <= 0) {
			//
			add(dates = ObjectUtils.getIfNull(dates, ArrayList::new), getTime(calendar));
			//
			calendar.add(Calendar.DATE, 1);
			//
		} // while
			//
		final File file = new File("JapaneseDateWesternDateSpreadSheet.xlsx");
		//
		try (final Workbook wb = new XSSFWorkbook(); final OutputStream os = new FileOutputStream(file)) {
			//
			Date date = null;
			//
			Sheet sheet = null;
			//
			int physicalNumberOfRows;
			//
			Row row;
			//
			Constructor<?> constructor = null;
			//
			Locale locale = null;
			//
			TriConsumer<Cell, Calendar, DateFormat> triConsumer = null;
			//
			Function<Row, Cell> function = null;
			//
			for (int i = 0; i < IterableUtils.size(dates); i++) {
				//
				if ((date = IterableUtils.get(dates, i)) == null) {
					//
					continue;
					//
				} // if
					//
				if ((sheet = ObjectUtils.getIfNull(sheet, () -> wb.createSheet())) == null) {
					//
					continue;
					//
				} // if
					//
				if ((physicalNumberOfRows = sheet.getPhysicalNumberOfRows()) == 0
						&& (row = sheet.createRow(physicalNumberOfRows)) != null) {
					//
					setCellValue(row.createCell(row.getPhysicalNumberOfCells()), "Year");
					//
					setCellValue(row.createCell(row.getPhysicalNumberOfCells()), "Month");
					//
					setCellValue(row.createCell(row.getPhysicalNumberOfCells()), "Day");
					//
					setCellValue(row.createCell(row.getPhysicalNumberOfCells()), "年号");
					//
					setBlank(row.createCell(row.getPhysicalNumberOfCells()));
					//
					setBlank(row.createCell(row.getPhysicalNumberOfCells()));
					//
				} // if
					//
				if ((row = sheet.createRow(sheet.getPhysicalNumberOfRows())) == null) {
					//
					continue;
					//
				} // if
					//
				setTime(calendar = Calendar.getInstance(), date);
				//
				testAndAccept(Objects::nonNull,
						apply(function = ObjectUtils.getIfNull(function,
								() -> (x) -> x != null ? x.createCell(x.getPhysicalNumberOfCells()) : null), row),
						calendar, JapaneseDateWesternDateSpreadSheet24::setCellValue, a -> get(a, Calendar.YEAR, 0), 0,
						JapaneseDateWesternDateSpreadSheet24::setBlank);
				//
				testAndAccept(Objects::nonNull, apply(function, row), calendar,
						JapaneseDateWesternDateSpreadSheet24::setCellValue, a -> get(a, Calendar.MONTH, 0) + 1, 1,
						JapaneseDateWesternDateSpreadSheet24::setBlank);
				//
				testAndAccept(Objects::nonNull, apply(function, row), calendar,
						JapaneseDateWesternDateSpreadSheet24::setCellValue, a -> get(a, Calendar.DATE, 0), 0,
						JapaneseDateWesternDateSpreadSheet24::setBlank);
				//
				if (constructor == null) {
					//
					final List<Constructor<?>> list = toList(
							filter(testAndApply(Objects::nonNull, Locale.class.getConstructors(), Arrays::stream, null),
									c -> c != null && Arrays.equals(c.getParameterTypes(),
											new Class<?>[] { String.class, String.class, String.class })));
					//
					if (IterableUtils.size(list) > 1) {
						//
						throw new IllegalStateException();
						//
					} else if (IterableUtils.size(list) == 1) {
						//
						constructor = IterableUtils.get(list, 0);
						//
					} // if
						//
				} // if
					//
				if (locale == null) {
					//
					locale = cast(Locale.class, newInstance(constructor, "ja", "JP", "JP"));
					//
				} // if
					//
				testAndAccept(Objects::nonNull, apply(function, row), calendar, new SimpleDateFormat("G", locale),
						triConsumer = ObjectUtils.getIfNull(triConsumer,
								() -> (a, b, c) -> setCellValue(a, format(c, getTime(b)))),
						JapaneseDateWesternDateSpreadSheet24::setBlank);
				//
				testAndAccept(Objects::nonNull, apply(function, row), calendar, new SimpleDateFormat("yyyy", locale),
						triConsumer, JapaneseDateWesternDateSpreadSheet24::setBlank);
				//
				testAndAccept(Objects::nonNull, apply(function, row), calendar, new SimpleDateFormat("Gyyyy年", locale),
						triConsumer, JapaneseDateWesternDateSpreadSheet24::setBlank);
				//
			} // for
				//
			setAutoFilter(sheet, new CellRangeAddress(0, sheet.getLastRowNum(), 0, 5));
			//
			wb.write(os);
			//
		} // try
			//
		System.out.println(file.getAbsolutePath());
		//
	}

	private static AutoFilter setAutoFilter(final Sheet instance, final CellRangeAddress range) {
		return instance != null ? instance.setAutoFilter(range) : null;
	}

	private static String format(final DateFormat instance, final Date date) {
		return instance != null ? instance.format(date) : null;
	}

	private static <T, U, R> void testAndAccept(final Predicate<U> predicate, final T t, final U u,
			final ObjIntConsumer<T> consumerTrue, final ToIntFunction<U> toIntFunction, final int defaultValue,
			final Consumer<T> consumerFalse) {
		//
		if (test(predicate, u)) {
			//
			accept(consumerTrue, t, toIntFunction != null ? toIntFunction.applyAsInt(u) : defaultValue);
			//
		} else {
			//
			accept(consumerFalse, t);
			//
		} // if
			//
	}

	private static <T, U> void accept(final ObjIntConsumer<T> instance, final T t, final int u) {
		if (instance != null) {
			instance.accept(t, u);
		}
	}

	private static <T, U, R> void testAndAccept(final Predicate<U> predicate, final T t, final U u, final R r,
			final TriConsumer<T, U, R> consumerTrue, final Consumer<T> consumerFalse) {
		//
		if (test(predicate, u)) {
			//
			accept(consumerTrue, t, u, r);
			//
		} else {
			//
			accept(consumerFalse, t);
			//
		} // if
			//
	}

	private static <T> void accept(final Consumer<T> instance, final T value) {
		if (instance != null) {
			instance.accept(value);
		}
	}

	private static <T, U, R> void accept(final TriConsumer<T, U, R> instance, final T t, final U u, final R r) {
		if (instance != null) {
			instance.accept(t, u, r);
		}
	}

	private static int get(final Calendar instance, final int field, final int defaultValue) {
		return instance != null ? instance.get(field) : defaultValue;
	}

	private static Date getTime(final Calendar instance) {
		return instance != null ? instance.getTime() : null;
	}

	private static void setTime(final Calendar instance, final Date time) {
		if (instance != null) {
			instance.setTime(time);
		}
	}

	private static void setBlank(final Cell instance) {
		if (instance != null) {
			instance.setBlank();
		}
	}

	private static void setCellValue(final Cell instance, final double value) {
		if (instance != null) {
			instance.setCellValue(value);
		}
	}

	private static void setCellValue(final Cell instance, final String value) {
		if (instance != null) {
			instance.setCellValue(value);
		}
	}

	private static <T> T newInstance(final Constructor<T> instance, final Object... args)
			throws InstantiationException, IllegalAccessException, InvocationTargetException {
		return instance != null ? instance.newInstance(args) : null;
	}

	private static int compare(final String a, final String b, final int defaultValue) {
		return a != null ? a.compareTo(b) : defaultValue;
	}

	private static List<YearMonthDay> getJapaneseEraSinceDates() throws IOException {
		//
		List<YearMonthDay> list = null;
		//
		final Class<?> clz = JapaneseEra.class;
		//
		try (final InputStream is = getResourceAsStream(clz,
				StringUtils.join("/", replace(getName(clz), ".", "/"), ".class"))) {
			//
			final List<MethodModel> mms = toList(filter(stream(methods(parse(ClassFile.of(), readAllBytes(is)))),
					m -> Objects.equals(stringValue(methodName(m)), "<clinit>")));
			//
			MethodModel mm = null;
			//
			if (IterableUtils.size(mms) > 1) {
				//
				throw new IllegalStateException();
				//
			} else if (IterableUtils.size(mms) == 1) {
				//
				mm = IterableUtils.get(mms, 0);
				//
			} // if
				//
			final List<CodeElement> ces = elementList(testAndApply(JapaneseDateWesternDateSpreadSheet24::isPresent,
					code(mm), JapaneseDateWesternDateSpreadSheet24::get, null));
			//
			CodeElement ce = null;
			//
			Number year = null, month = null, day = null;
			//
			YearMonthDay yearMonthDay = null;
			//
			for (int i = 0; i < IterableUtils.size(ces); i++) {
				//
				if ((ce = IterableUtils.get(ces, i)) == null) {
					//
					continue;
					//
				} // if
					//
				year = month = day = null;
				//
				if (ce instanceof InvokeInstruction ii && ii != null
						&& Objects.equals(stringValue(name(ii.owner())), "java/time/LocalDate")) {
					//
					if (i > 2) {
						//
						year = getNumber(IterableUtils.get(ces, i - 3));
						//
						month = getNumber(IterableUtils.get(ces, i - 2));
						//
						day = getNumber(IterableUtils.get(ces, i - 1));
						//
					} // if
						//
					if ((yearMonthDay = year != null && month != null && day != null ? new YearMonthDay()
							: null) != null) {
						//
						yearMonthDay.year = year.intValue();
						//
						yearMonthDay.month = month.intValue();
						//
						yearMonthDay.day = day.intValue();
						//
						add(list = ObjectUtils.getIfNull(list, ArrayList::new), yearMonthDay);
						//
					} // if
						//
				} // if
					//
			} // for
				//
		} // try
			//
		return list;
		//
	}

	private static Utf8Entry name(final ClassEntry instance) {
		return instance != null ? instance.name() : null;
	}

	private static String stringValue(final Utf8Entry instance) {
		return instance != null ? instance.stringValue() : null;
	}

	private static Utf8Entry methodName(final MethodModel instance) {
		return instance != null ? instance.methodName() : null;
	}

	private static String getName(final Class<?> instance) {
		return instance != null ? instance.getName() : null;
	}

	private static InputStream getResourceAsStream(final Class<?> instance, final String path) {
		return instance != null ? instance.getResourceAsStream(path) : null;
	}

	private static byte[] readAllBytes(final InputStream instance) throws IOException {
		return instance != null ? instance.readAllBytes() : null;
	}

	private static List<MethodModel> methods(final ClassModel instance) {
		return instance != null ? instance.methods() : null;
	}

	private static ClassModel parse(final ClassFile instance, final byte[] bytes) {
		return instance != null ? instance.parse(bytes) : null;
	}

	private static <E> Stream<E> stream(final Collection<E> instance) {
		return instance != null ? instance.stream() : null;
	}

	private static <E> void add(final Collection<E> instance, final E item) {
		if (instance != null) {
			instance.add(item);
		}
	}

	private static Number getNumber(final CodeElement instance) {
		//
		if (instance instanceof ArgumentConstantInstruction aci && aci != null) {
			//
			return aci.constantValue();
			//
		} else if (instance instanceof IntrinsicConstantInstruction ici && ici != null) {
			//
			final ConstantDesc cv = ici.constantValue();
			//
			return cv instanceof Number ? cast(Number.class, cv) : null;
			//
		} // if
			//
		return null;
		//
	}

	private static <E extends ClassFileElement> List<E> elementList(final CompoundElement<E> instance) {
		return instance != null ? instance.elementList() : null;
	}

	private static <T> T get(final Optional<T> instnace) {
		return instnace != null && instnace.isPresent() ? instnace.get() : null;
	}

	private static boolean isPresent(final Optional<?> instnace) {
		return instnace != null && instnace.isPresent();
	}

	private static Optional<CodeModel> code(final MethodModel instance) {
		return instance != null ? instance.code() : null;
	}

	private static <T, R> R testAndApply(final Predicate<T> predicate, final T value, final Function<T, R> functionTrue,
			final Function<T, R> functionFalse) {
		return test(predicate, value) ? apply(functionTrue, value) : apply(functionFalse, value);
	}

	private static <T> boolean test(final Predicate<T> instance, final T value) {
		return instance != null && instance.test(value);
	}

	private static <T, R> R apply(final Function<T, R> instance, final T value) {
		return instance != null ? instance.apply(value) : null;
	}

	private static <T> List<T> toList(final Stream<T> instance) {
		return instance != null ? instance.toList() : null;
	}

	private static <T> Stream<T> filter(final Stream<T> instance, final Predicate<? super T> predicate) {
		return instance != null ? instance.filter(predicate) : instance;
	}

	private static String replace(final String instance, final CharSequence target, final CharSequence replacement) {
		return instance != null ? instance.replace(target, replacement) : null;
	}

	private static <T> T cast(final Class<T> clz, final Object instance) {
		return clz != null && clz.isInstance(instance) ? clz.cast(instance) : null;
	}

}

Required dependencies

<!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml -->
<dependency>
	<groupId>org.apache.poi</groupId>
	<artifactId>poi-ooxml</artifactId>
	<version>5.5.1</version>
</dependency>

https://docs.oracle.com/en/java/javase/24/docs/api/java.base/java/lang/classfile/package-summary.html