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PlantUML is a component that allows to quickly write diagrams from text.
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// THIS FILE HAS BEEN GENERATED BY A PREPROCESSOR.
/* +=======================================================================
 * |
 * |      PlantUML : a free UML diagram generator
 * |
 * +=======================================================================
 *
 * (C) Copyright 2009-2024, Arnaud Roques
 *
 * Project Info:  https://plantuml.com
 *
 * If you like this project or if you find it useful, you can support us at:
 *
 * https://plantuml.com/patreon (only 1$ per month!)
 * https://plantuml.com/liberapay (only 1€ per month!)
 * https://plantuml.com/paypal
 *
 *
 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the Apache Software License.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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.
 *
 * PlantUML can occasionally display sponsored or advertising messages. Those
 * messages are usually generated on welcome or error images and never on
 * functional diagrams.
 * See https://plantuml.com/professional if you want to remove them
 *
 * Images (whatever their format : PNG, SVG, EPS...) generated by running PlantUML
 * 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 APACHE license.
 *
 * The generated images can then be used without any reference to the APACHE license.
 * It is not even necessary to stipulate that they have been generated with PlantUML,
 * although this will be appreciated by the PlantUML team.
 *
 * There is an exception : if the textual description in PlantUML language is also covered
 * by any license, then the generated images are logically covered
 * by the very same license.
 *
 * This is the IGY distribution (Install GraphViz by Yourself).
 * You have to install GraphViz and to setup the GRAPHVIZ_DOT environment variable
 * (see https://plantuml.com/graphviz-dot )
 *
 * Icons provided by OpenIconic :  https://useiconic.com/open
 * Archimate sprites provided by Archi :  http://www.archimatetool.com
 * Stdlib AWS provided by https://github.com/milo-minderbinder/AWS-PlantUML
 * Stdlib Icons provided https://github.com/tupadr3/plantuml-icon-font-sprites
 * ASCIIMathML (c) Peter Jipsen http://www.chapman.edu/~jipsen
 * ASCIIMathML (c) David Lippman http://www.pierce.ctc.edu/dlippman
 * CafeUndZopfli ported by Eugene Klyuchnikov https://github.com/eustas/CafeUndZopfli
 * Brotli (c) by the Brotli Authors https://github.com/google/brotli
 * Themes (c) by Brett Schwarz https://github.com/bschwarz/puml-themes
 * Twemoji (c) by Twitter at https://twemoji.twitter.com/
 *
 */
package net.sourceforge.plantuml.klimt.sprite;

import static java.nio.charset.StandardCharsets.UTF_8;

import java.io.IOException;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLDecoder;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Set;
import java.util.TreeSet;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

import net.sourceforge.plantuml.log.Logme;
import net.sourceforge.plantuml.security.SFile;
import net.sourceforge.plantuml.version.Version;

public class ResourcesUtils {

	public static Set getJarFile(String path, boolean folder) throws IOException {
		if (path.startsWith("/") || path.endsWith("/")) {
			throw new IllegalArgumentException();
		}
		final String protocol = getProtocol();
		if ("file".equals(protocol)) {
			final URL local = Version.class.getClassLoader().getResource(path);
			try {
				return listEntry(new SFile(local.toURI()));
			} catch (URISyntaxException e) {
				Logme.error(e);
				return null;
			}
		}
		if ("jar".equals(protocol)) {
			final String classFile = Version.class.getName().replace(".", "/") + ".class";
			final URL versionURL = Version.class.getClassLoader().getResource(classFile);
			final String jarPath = versionURL.getPath().substring(5, versionURL.getPath().indexOf("!"));
			if (folder) {
				return listFolders(new JarFile(URLDecoder.decode(jarPath, UTF_8.name())), path + "/");
			} else {
				return listFiles(new JarFile(URLDecoder.decode(jarPath, UTF_8.name())), path + "/");

			}
		}
		return Collections.emptySet();
	}

	private static String getProtocol() {
		final URL resource = Version.class.getClassLoader().getResource("net/sourceforge/plantuml/version/logo.png");
		return resource.getProtocol();
	}

	private static Set listFiles(JarFile jarFile, String path) {
		final Enumeration entries = jarFile.entries();
		final Set result = new TreeSet<>();
		while (entries.hasMoreElements()) {
			final String name = entries.nextElement().getName();
			if (name.startsWith(path)) {
				result.add(name.substring(path.length()));
			}
		}
		return result;
	}

	private static Set listFolders(JarFile jarFile, String path) {
		final Enumeration entries = jarFile.entries();
		final Set result = new TreeSet<>();
		while (entries.hasMoreElements()) {
			final String name = entries.nextElement().getName();
			if (name.startsWith(path)) {
				final String folder = name.substring(path.length());
				final int x = folder.indexOf('/');
				if (x != -1) {
					result.add(folder.substring(0, x));
				}
			}
		}
		return result;
	}

	private static Set listEntry(SFile dir) {
		final Set result = new TreeSet<>();
		for (String n : dir.list()) {
			result.add(n);
		}
		return result;
	}

}