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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.theme;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Objects;

import net.sourceforge.plantuml.klimt.sprite.ResourcesUtils;
import net.sourceforge.plantuml.preproc.ReadLine;
import net.sourceforge.plantuml.preproc.ReadLineReader;
import net.sourceforge.plantuml.preproc.Stdlib;
import net.sourceforge.plantuml.utils.Log;

// ::uncomment when __CORE__
//import static com.plantuml.api.cheerpj.StaticMemory.cheerpjPath;
//import java.io.FileInputStream;
//import java.io.FileNotFoundException;

public class ThemeUtils {
	// ::remove folder when __HAXE__

	private static final String THEME_FILE_PREFIX = "puml-theme-";

	private static final String THEME_FILE_SUFFIX = ".puml";

	private static final String THEME_PATH = "themes";

	// ::uncomment when __CORE__
//	public static ReadLine getReaderTheme(String filename) throws FileNotFoundException {
//	Log.info("Loading theme " + filename);
//	final String fullpath = cheerpjPath + THEME_PATH + "/" + THEME_FILE_PREFIX + filename
//			+ THEME_FILE_SUFFIX;
//
//	final String res = "/" + THEME_PATH + "/" + THEME_FILE_PREFIX + filename + THEME_FILE_SUFFIX;
//	final String description = "<" + res + ">";
//	final InputStream is = new FileInputStream(fullpath);
//	return ReadLineReader.create(new InputStreamReader(is), description);
//}

	// ::comment when __CORE__
	public static ReadLine getReaderTheme(String realName, String from) {
		final String description = realName + " from " + from;
		from = from.substring(1, from.length() - 1);
		final String res = from + "/" + THEME_FILE_PREFIX + realName + THEME_FILE_SUFFIX;
		final InputStream is = Stdlib.getResourceAsStream(res);
		if (is == null)
			return null;

		return ReadLineReader.create(new InputStreamReader(is), description);
	}

	public static ReadLine getReaderTheme(String filename) {
		Log.info("Loading theme " + filename);
		final String res = "/" + THEME_PATH + "/" + THEME_FILE_PREFIX + filename + THEME_FILE_SUFFIX;
		final String description = "<" + res + ">";
		final InputStream is = Stdlib.class.getResourceAsStream(res);
		if (is == null)
			return null;

		return ReadLineReader.create(new InputStreamReader(is), description);
	}

	public static List getAllThemeNames() throws IOException {
		final Collection filenames = Objects.requireNonNull(ResourcesUtils.getJarFile(THEME_PATH, false));
		final List result = new ArrayList<>();
		for (String f : filenames) {
			if (f.startsWith(THEME_FILE_PREFIX) && f.endsWith(THEME_FILE_SUFFIX)) {
				result.add(f.substring(THEME_FILE_PREFIX.length(), f.length() - THEME_FILE_SUFFIX.length()));
			}
		}
		Collections.sort(result);
		return result;
	}

	public static String getFullPath(String from, String filename) {
		final StringBuilder sb = new StringBuilder(from);
		if (from.endsWith("/") == false) {
			sb.append("/");
		}
		return sb + getFilename(filename);
	}

	public static String getFilename(String filename) {
		return THEME_FILE_PREFIX + filename + THEME_FILE_SUFFIX;
	}

}