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PowerMock Java agent support.

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/*
 * Copyright 2011 the original author or authors.
 *
 * 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 org.powermock.modules.agent;

import net.bytebuddy.jar.asm.ClassReader;
import net.bytebuddy.jar.asm.ClassWriter;

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

public class DefinalizingClassTransformer extends AbstractClassTransformer implements ClassFileTransformer {
    private static final int NO_FLAGS_OR_OPTIONS = 0;

    public byte[] transform(ClassLoader loader, String className, Class classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer) {
        if (loader == null || shouldIgnore(className)) {
            return null;
        }
        final ClassReader reader = new ClassReader(classfileBuffer);
        final ClassWriter writer = new ClassWriter(NO_FLAGS_OR_OPTIONS);
        reader.accept(new DefinalizingClassVisitor(writer), NO_FLAGS_OR_OPTIONS);
        return writer.toByteArray();
    }
}