/*
 *   This file is a part of the SteamWar software.
 *
 *   Copyright (C) 2026 SteamWar.de-Serverteam
 *
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU Affero General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *   GNU Affero General Public License for more details.
 *
 *   You should have received a copy of the GNU Affero General Public License
 *   along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

package de.steamwar;

import java.lang.instrument.ClassFileTransformer;
import java.security.ProtectionDomain;
import java.util.List;

/**
 * Transforms class bytecode to apply access widening rules.
 * <p>
 * Also monitors for new plugin ClassLoaders appearing (when plugins load after
 * the agent attaches) and automatically picks up their .accesswidener files.
 */
public class WideningTransformer implements ClassFileTransformer {

    private final ClassPatcher patcher;

    public WideningTransformer(List<AccessWidenerEntry> entries) {
        patcher = new ClassPatcher(entries);
    }

    @Override
    public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer) {
        return patcher.patch(className, classfileBuffer);
    }
}