de.florianmichael.asmfabricloader.api.AsmUtil Maven / Gradle / Ivy

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/*
 * This file is part of AsmFabricLoader - https://github.com/FlorianMichael/AsmFabricLoader
 * Copyright (C) 2023-2024 FlorianMichael/EnZaXD 
 *
 *  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.
 */

package de.florianmichael.asmfabricloader.api;

import sun.misc.Unsafe;

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;

/**
 * This class is used to access the {@link Unsafe} instance.
 */
public class AsmUtil {

    private static Unsafe unsafe;

    /**
     * @param input A class path
     * @return The class path converted to descriptor format (Replaced all '.' with '/')
     */
    public static String normalizeDescriptor(final String input) {
        return input.replace(".", "/");
    }

    /**
     * @param input A class path
     * @return The class path converted to class name format (Replaced all '/' with '.')
     */
    public static String normalizeClassName(final String input) {
        return input.replace("/", ".");
    }

    /**
     * @param owner A class
     * @return All superclasses of the given class as a list of strings (formatted by {@link #normalizeDescriptor(String)}
     */
    public static List getClassStruct(Class owner) {
        final List classNames = new ArrayList<>();

        classNames.add(normalizeDescriptor(owner.getName()));
        while (!owner.getName().equals("java.lang.Object")) {
            owner = owner.getSuperclass();
            classNames.add(normalizeDescriptor(owner.getName()));
        }

        return classNames;
    }

    /**
     * @return the {@link Unsafe} instance
     */
    public static Unsafe getTheUnsafe() {
        if (unsafe == null) {
            try {
                final Field theUnsafe = Unsafe.class.getDeclaredField("theUnsafe");
                theUnsafe.setAccessible(true);

                unsafe = (Unsafe) theUnsafe.get(null);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }
        return unsafe;
    }

}