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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.
package net.sourceforge.plantuml.klimt.font;

import java.awt.Font;
import java.awt.GraphicsEnvironment;
import java.util.HashSet;
import java.util.Set;

import net.sourceforge.plantuml.StringUtils;

public class UFont {

	private final Font font;
	private final String family;

	// ::comment when __HAXE__
	private static final Set names = new HashSet<>();

	static {
//		try {
//			Roboto.registerFonts();
//		} catch (Exception e) {
//			e.printStackTrace();
//		}
		for (String name : GraphicsEnvironment.getLocalGraphicsEnvironment().getAvailableFontFamilyNames())
			names.add(name.toLowerCase());
	}

	public String toStringDebug() {
		final StringBuilder sb = new StringBuilder();
		sb.append(getPortableFontName());
		sb.append("/");
		sb.append(font.getSize());
		return sb.toString();
	}

	public static UFont build(String fontFamily, int fontStyle, int fontSize) {
		final String family = getExistingFontFamily(fontFamily);
		final Font font = new Font(family, fontStyle, fontSize);
		return new UFont(font, fontFamily);
	}

	private UFont(Font font, String family) {
		this.font = font;
		this.family = family;
	}

	public static String getExistingFontFamily(String fontFamily) {
		if (fontFamily.contains(",")) {
			for (String name : fontFamily.split(",")) {
				name = StringUtils.eventuallyRemoveStartingAndEndingDoubleQuote(name.trim()).trim();
				if (doesFamilyExists(name))
					return name;
			}
			return "SansSerif";
		}
		return StringUtils.eventuallyRemoveStartingAndEndingDoubleQuote(fontFamily.trim()).trim();
	}

	private static boolean doesFamilyExists(String name) {
		// ::revert when __HAXE__
		return names.contains(name.toLowerCase());
		// return true;
	}

	public static UFont serif(int size) {
		return UFont.build("Serif", Font.PLAIN, size);
	}

	public static UFont sansSerif(int size) {
		return UFont.build("SansSerif", Font.PLAIN, size);
	}

	public static UFont courier(int size) {
		return UFont.build("Courier", Font.PLAIN, size);
	}

	public static UFont byDefault(int size) {
		return sansSerif(12);
	}

	public UFont goTikz(int delta) {
		return new UFont(new Font("Serif", getStyle(), getSize() + delta), "Serif");
	}

	public static UFont monospaced(int size) {
		return UFont.build("Monospaced", Font.PLAIN, size);
	}

	public final Font getUnderlayingFont(UFontContext context) {
		return font;
	}

	public UFont withSize(float size) {
		return new UFont(font.deriveFont(size), family);
	}

	public UFont withStyle(int style) {
		return new UFont(font.deriveFont(style), family);
	}

	public UFont bold() {
		return withStyle(Font.BOLD);
	}

	public UFont italic() {
		return withStyle(Font.ITALIC);
	}

	public int getStyle() {
		return font.getStyle();
	}

	public int getSize() {
		return font.getSize();
	}

	public double getSize2D() {
		return font.getSize2D();
	}

	public boolean isBold() {
		return font.isBold();
	}

	public boolean isItalic() {
		return font.isItalic();
	}

	public String getFamily(UFontContext context) {
		if (context == UFontContext.EPS) {
			if (family == null)
				return "Times-Roman";

			return font.getPSName();
		}
		if (context == UFontContext.SVG) {
			String result = family.replace('\"', '\'');
			result = result.replaceAll("(?i)sansserif", "sans-serif");

			return result;
		}
		return family;
	}

	// Kludge for testing because font names on some machines (only macOS?) do not
	// end with