94 lines
3.1 KiB
Java
94 lines
3.1 KiB
Java
/*
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*
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* PlaceholderAPI
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* Copyright (C) 2018 Ryan McCarthy
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*
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*/
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package me.clip.placeholderapi.util;
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import java.io.File;
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import java.io.FilenameFilter;
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import java.net.URL;
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import java.net.URLClassLoader;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.jar.JarEntry;
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import java.util.jar.JarInputStream;
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import me.clip.placeholderapi.PlaceholderAPIPlugin;
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public class FileUtil {
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public static List<Class<?>> getClasses(String folder, Class<?> type) {
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List<Class<?>> list = new ArrayList<>();
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try {
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File f = new File(PlaceholderAPIPlugin.getInstance().getDataFolder(), folder);
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if (!f.exists()) {
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if (!f.mkdir()) {
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PlaceholderAPIPlugin.getInstance().getLogger().severe("Failed to create " + folder + " folder!");
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}
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return list;
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}
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FilenameFilter fileNameFilter = (dir, name) -> {
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int i = name.lastIndexOf('.');
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return i > 0 && name.substring(i).equals(".jar");
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};
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File[] jars = f.listFiles(fileNameFilter);
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if (jars == null) {
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return list;
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}
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for (File file : jars) {
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list = gather(file.toURI().toURL(), list, type);
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}
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return list;
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} catch (Throwable t) {}
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return null;
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}
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private static List<Class<?>> gather(URL jar, List<Class<?>> list, Class<?> clazz) {
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if (list == null) {
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list = new ArrayList<>();
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}
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try {
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URLClassLoader cl = new URLClassLoader(new URL[]{jar}, clazz.getClassLoader());
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JarInputStream jis = new JarInputStream(jar.openStream());
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while (true) {
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JarEntry j = jis.getNextJarEntry();
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if (j == null) {
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break;
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}
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String name = j.getName();
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if (name == null || name.isEmpty()) {
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continue;
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}
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if (name.endsWith(".class")) {
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name = name.replace("/", ".");
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String cname = name.substring(0, name.lastIndexOf(".class"));
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Class<?> c = cl.loadClass(cname);
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if (clazz.isAssignableFrom(c)) {
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list.add(c);
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}
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}
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}
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cl.close();
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jis.close();
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} catch (Throwable t) {
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}
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return list;
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}
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}
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