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Gradle Plugin for building JavaFX mobile applications

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/*
 * BSD 3-Clause License
 *
 * Copyright (c) 2018, Gluon Software
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * * Neither the name of the copyright holder nor the names of its
 *   contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.javafxports.retrobuffer;

import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.ClassWriter;

import java.util.function.Consumer;

public class Transformer {

    public byte[] backport(ClassReader reader) {
        return transform(reader, (next) -> {
            next = new UpdateBufferMethods(next);
            return next;
        });
    }

    private byte[] transform(ClassReader reader, ClassVisitorChain chain) {
        return transform(reader.getClassName(), cv -> reader.accept(cv, 0), chain);
    }

    private byte[] transform(String className, Consumer reader, ClassVisitorChain chain) {
        try {
            ClassWriter writer = new ClassWriter(ClassWriter.COMPUTE_MAXS);
            ClassVisitor next = writer;

            next = chain.wrap(next);

            reader.accept(next);
            return writer.toByteArray();
        } catch (Throwable t) {
            throw new RuntimeException("Failed to backport class: " + className, t);
        }
    }

    private interface ClassVisitorChain {
        ClassVisitor wrap(ClassVisitor next);
    }
}