net.minecrell.quartz.launch.transformers.MappingTreeTransformer.java Source code

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Here is the source code for net.minecrell.quartz.launch.transformers.MappingTreeTransformer.java

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/*
 * Quartz
 * Copyright (c) 2015, Minecrell <https://github.com/Minecrell>
 *
 * Based on Sponge and SpongeAPI, licensed under the MIT License (MIT).
 * Copyright (c) SpongePowered.org <http://www.spongepowered.org>
 * 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 net.minecrell.quartz.launch.transformers;

import static java.util.Objects.requireNonNull;

import net.minecraft.launchwrapper.IClassTransformer;
import net.minecraft.launchwrapper.Launch;
import net.minecrell.quartz.launch.mappings.Mappings;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.tree.ClassNode;

public abstract class MappingTreeTransformer implements IClassTransformer {

    protected final Mappings mappings;

    protected MappingTreeTransformer() {
        this((Mappings) Launch.blackboard.get("quartz.mappings"));
    }

    protected MappingTreeTransformer(Mappings mappings) {
        this.mappings = requireNonNull(mappings, "mappings");
    }

    protected int readerFlags() {
        return 0;
    }

    protected int writerFlags() {
        return 0;
    }

    protected abstract boolean transform(String name, String transformedName);

    protected abstract void transform(String name, String transformedName, ClassNode classNode);

    @Override
    public byte[] transform(String name, String transformedName, byte[] basicClass) {
        if (basicClass == null) {
            return null;
        }

        if (!transform(name, transformedName)) {
            return basicClass;
        }

        ClassNode classNode = new ClassNode();
        ClassReader reader = new ClassReader(basicClass);
        reader.accept(classNode, readerFlags());

        transform(name, transformedName, classNode);

        ClassWriter writer = new ClassWriter(writerFlags());
        classNode.accept(writer);
        return writer.toByteArray();
    }

}