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Extra annotations for use with shadow and Bukkit
There is a newer version: 1.20.1
/*
 * This file is part of shadow-bukkit, licensed under the MIT License.
 *
 *  Copyright (c) lucko (Luck) 
 *  Copyright (c) contributors
 *
 *  Permission is hereby granted, free of charge, to any person obtaining a copy
 *  of this software and associated documentation files (the "Software"), to deal
 *  in the Software without restriction, including without limitation the rights
 *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 *  copies of the Software, and to permit persons to whom the Software is
 *  furnished to do so, subject to the following conditions:
 *
 *  The above copyright notice and this permission notice shall be included in all
 *  copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 *  SOFTWARE.
 */

package me.lucko.shadow.bukkit;

import me.lucko.shadow.Shadow;
import me.lucko.shadow.TargetResolver;
import org.checkerframework.checker.nullness.qual.NonNull;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.Optional;

/**
 * Defines a class, method or field target with a value that varies between package versions.
 */
@Target({ElementType.TYPE, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
public @interface ObfuscatedTarget {

    /**
     * Gets the mappings.
     *
     * @return the mappings
     */
    Mapping[] value();

    /**
     * A {@link TargetResolver} for the {@link ObfuscatedTarget} annotation.
     */
    TargetResolver RESOLVER = new TargetResolver() {
        @Override
        public @NonNull Optional> lookupClass(@NonNull Class shadowClass) throws ClassNotFoundException {
            String className = Optional.ofNullable(shadowClass.getAnnotation(ObfuscatedTarget.class))
                    .flatMap(annotation -> Arrays.stream(annotation.value())
                            .filter(mapping -> PackageVersion.runtimeVersion() == mapping.version())
                            .findFirst()
                    )
                    .map(Mapping::value)
                    .orElse(null);

            if (className == null) {
                return Optional.empty();
            }
            return Optional.of(Class.forName(className));
        }

        @Override
        public @NonNull Optional lookupMethod(@NonNull Method shadowMethod, @NonNull Class shadowClass, @NonNull Class targetClass) {
            return Optional.ofNullable(shadowMethod.getAnnotation(ObfuscatedTarget.class))
                    .flatMap(annotation -> Arrays.stream(annotation.value())
                            .filter(mapping -> PackageVersion.runtimeVersion() == mapping.version())
                            .findFirst()
                    )
                    .map(Mapping::value);
        }

        @Override
        public @NonNull Optional lookupField(@NonNull Method shadowMethod, @NonNull Class shadowClass, @NonNull Class targetClass) {
            return Optional.ofNullable(shadowMethod.getAnnotation(ObfuscatedTarget.class))
                    .flatMap(annotation -> Arrays.stream(annotation.value())
                            .filter(mapping -> PackageVersion.runtimeVersion() == mapping.version())
                            .findFirst()
                    )
                    .map(Mapping::value);
        }
    };

}