DayOfWeekUtils.java

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 * PlantUML : a free UML diagram generator
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 * (C) Copyright 2009-2024, Arnaud Roques
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 * Original Author:  Arnaud Roques
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package net.sourceforge.plantuml.project.time;

import java.time.DayOfWeek;
import java.time.format.TextStyle;
import java.util.Locale;

import net.sourceforge.plantuml.StringUtils;

public abstract class DayOfWeekUtils {

	public static String getRegexString() {
		final StringBuilder sb = new StringBuilder();
		for (DayOfWeek day : DayOfWeek.values()) {
			if (sb.length() > 0)
				sb.append("|");

			sb.append(day.name().substring(0, 3) + "[a-z]*");
		}
		return sb.toString();
	}

	public static DayOfWeek fromString(String value) {
		value = StringUtils.goUpperCase(value).substring(0, 3);
		for (DayOfWeek day : DayOfWeek.values()) {
			if (day.name().startsWith(value))
				return day;

		}
		throw new IllegalArgumentException();
	}

	public static String shortName(DayOfWeek dayOfWeek, Locale locale) {
		if (locale == Locale.ENGLISH)
			return StringUtils.capitalize(dayOfWeek.name().substring(0, 2));
		final String s = StringUtils.capitalize(dayOfWeek.getDisplayName(TextStyle.SHORT_STANDALONE, locale));
		if (s.length() > 2)
			return s.substring(0, 2);
		return s;
	}

}