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PlantUML is a component that allows to quickly write diagrams from text.
There is a newer version: 1.2024.8
// THIS FILE HAS BEEN GENERATED BY A PREPROCESSOR.
/* +=======================================================================
 * |
 * |      PlantUML : a free UML diagram generator
 * |
 * +=======================================================================
 *
 * (C) Copyright 2009-2024, Arnaud Roques
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 * Project Info:  https://plantuml.com
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 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License V2.
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 * LICENSE ("AGREEMENT"). [GNU General Public License V2]
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 * RECIPIENT'S ACCEPTANCE OF THIS AGREEMENT.
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 * You may obtain a copy of the License at
 *
 * https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
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 * messages are usually generated on welcome or error images and never on
 * functional diagrams.
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 * are owned by the author of their corresponding sources code (that is, their
 * textual description in PlantUML language). Those images are not covered by
 * this GPL v2 license.
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 * Icons provided by OpenIconic :  https://useiconic.com/open
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 * ASCIIMathML (c) Peter Jipsen http://www.chapman.edu/~jipsen
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 * CafeUndZopfli ported by Eugene Klyuchnikov https://github.com/eustas/CafeUndZopfli
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 *
 */
package net.sourceforge.plantuml.project.time;

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

import net.sourceforge.plantuml.StringUtils;

public enum Month {

	JANUARY(31), FEBRUARY(28), MARCH(31), APRIL(30), MAY(31), JUNE(30), //
	JULY(31), AUGUST(31), SEPTEMBER(30), OCTOBER(31), NOVEMBER(30), DECEMBER(31);

	private final int daysPerMonth;

	private Month(int daysPerMonth) {
		this.daysPerMonth = daysPerMonth;
	}

	public String shortName(Locale locale) {
		if (locale == Locale.ENGLISH)
			return longName(locale).substring(0, 3);

		return StringUtils.capitalize(getJavaTimeMonth().getDisplayName(TextStyle.SHORT_STANDALONE, locale));
	}

	private java.time.Month getJavaTimeMonth() {
		return java.time.Month.valueOf(this.toString());
	}

	public String longName(Locale locale) {
		if (locale == Locale.ENGLISH)
			return StringUtils.capitalize(name());

		final java.time.Month javaTimeMonth = getJavaTimeMonth();
		return javaTimeMonth.getDisplayName(TextStyle.FULL_STANDALONE, locale);
//		final String v1 = javaTimeMonth.getDisplayName(TextStyle.FULL_STANDALONE, locale);
//		final String v2 = javaTimeMonth.getDisplayName(TextStyle.FULL, locale);
//		return StringUtils.capitalize(longest(v1, v2));
	}

//	private String longest(String v1, String v2) {
//		if (v1.length() > v2.length())
//			return v1;
//		return v2;
//	}

	static public String getRegexString() {
		final StringBuilder sb = new StringBuilder();
		for (Month month : Month.values()) {
			if (sb.length() > 0) {
				sb.append("|");
			}
			sb.append(month.name().substring(0, 3) + "[a-z]*");
		}
		return sb.toString();
	}

	public static Month fromString(String value) {
		value = StringUtils.goUpperCase(value).substring(0, 3);
		for (Month m : Month.values()) {
			if (m.name().startsWith(value)) {
				return m;
			}
		}
		throw new IllegalArgumentException();
	}

	public final int getDaysPerMonth(int year) {
		if (this == FEBRUARY && year % 4 == 0) {
			return 29;
		}
		return daysPerMonth;
	}

	public Month next() {
		return Month.values()[(this.ordinal() + 1) % 12];
	}

	public int m() {
		return 3 + (ordinal() + 10) % 12;
	}

}