94 lines
3.9 KiB
Java
94 lines
3.9 KiB
Java
// SPDX-License-Identifier: GPL-3.0-only
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/*
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* Prism Launcher - Minecraft Launcher
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* Copyright (C) 2022 icelimetea <fr3shtea@outlook.com>
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* Copyright (C) 2022 solonovamax <solonovamax@12oclockpoint.com>
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* Copyright (C) 2022 TheKodeToad <TheKodeToad@proton.me>
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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, version 3.
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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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* Linking this library statically or dynamically with other modules is
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* making a combined work based on this library. Thus, the terms and
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* conditions of the GNU General Public License cover the whole
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* combination.
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*
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* As a special exception, the copyright holders of this library give
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* you permission to link this library with independent modules to
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* produce an executable, regardless of the license terms of these
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* independent modules, and to copy and distribute the resulting
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* executable under terms of your choice, provided that you also meet,
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* for each linked independent module, the terms and conditions of the
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* license of that module. An independent module is a module which is
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* not derived from or based on this library. If you modify this
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* library, you may extend this exception to your version of the
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* library, but you are not obliged to do so. If you do not wish to do
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* so, delete this exception statement from your version.
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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 <https://www.gnu.org/licenses/>.
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*
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* This file incorporates work covered by the following copyright and
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* permission notice:
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*
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* Copyright 2013-2021 MultiMC Contributors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.prismlauncher.utils;
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import java.lang.invoke.MethodHandle;
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import java.lang.invoke.MethodHandles;
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import java.lang.invoke.MethodType;
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public final class ReflectionUtils {
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private static final MethodHandles.Lookup LOOKUP = MethodHandles.lookup();
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private static final ClassLoader LOADER = ClassLoader.getSystemClassLoader();
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/**
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* Gets the main method within a class.
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*
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* @param clazz The class
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* @return A method matching the descriptor of a main method
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* @throws ClassNotFoundException
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* @throws NoSuchMethodException
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* @throws IllegalAccessException
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*/
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public static MethodHandle findMainMethod(Class<?> clazz) throws NoSuchMethodException, IllegalAccessException {
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return LOOKUP.findStatic(clazz, "main", MethodType.methodType(void.class, String[].class));
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}
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/**
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* Gets the main method within a class by its name.
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*
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* @param clazz The class name
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* @return A method matching the descriptor of a main method
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* @throws ClassNotFoundException
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* @throws NoSuchMethodException
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* @throws IllegalAccessException
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*/
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public static MethodHandle findMainMethod(String clazz)
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throws ClassNotFoundException, NoSuchMethodException, IllegalAccessException {
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return findMainMethod(LOADER.loadClass(clazz));
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}
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}
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