78 lines
2.4 KiB
Java
78 lines
2.4 KiB
Java
/*
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* This file is part of PlaceholderAPI
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*
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* PlaceholderAPI
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* Copyright (c) 2015 - 2024 PlaceholderAPI Team
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*
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* PlaceholderAPI 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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* PlaceholderAPI 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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package me.clip.placeholderapi.util;
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import org.jetbrains.annotations.NotNull;
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import org.jetbrains.annotations.Nullable;
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import java.io.File;
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import java.io.IOException;
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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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public class FileUtil {
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@Nullable
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public static <T> Class<? extends T> findClass(@NotNull final File file,
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@NotNull final Class<T> clazz) throws IOException, ClassNotFoundException {
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if (!file.exists()) {
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return null;
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}
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final URL jar = file.toURI().toURL();
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final URLClassLoader loader = new URLClassLoader(new URL[]{jar}, clazz.getClassLoader());
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final List<String> matches = new ArrayList<>();
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final List<Class<? extends T>> classes = new ArrayList<>();
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try (final JarInputStream stream = new JarInputStream(jar.openStream())) {
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JarEntry entry;
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while ((entry = stream.getNextJarEntry()) != null) {
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final String name = entry.getName();
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if (name.isEmpty() || !name.endsWith(".class")) {
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continue;
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}
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matches.add(name.substring(0, name.lastIndexOf('.')).replace('/', '.'));
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}
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for (final String match : matches) {
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try {
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final Class<?> loaded = loader.loadClass(match);
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if (clazz.isAssignableFrom(loaded)) {
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classes.add(loaded.asSubclass(clazz));
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}
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} catch (final NoClassDefFoundError ignored) {
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}
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}
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}
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if (classes.isEmpty()) {
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loader.close();
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return null;
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}
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return classes.get(0);
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}
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}
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