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JMockit is a Java toolkit for developer (unit/integration) testing. It contains mocking APIs and other tools, supporting both JUnit and TestNG. The mocking APIs allow all kinds of Java code, without testability restrictions, to be tested in isolation from selected dependencies.

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/*
 * Copyright (c) 2006-2012 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.internal.startup;

import java.lang.instrument.*;
import java.security.*;

import mockit.internal.state.*;
import mockit.internal.util.*;

final class ProxyClassfileSavingTransformer implements ClassFileTransformer
{
   public byte[] transform(
      ClassLoader loader, String className, Class classBeingRedefined, ProtectionDomain protectionDomain,
      byte[] classfileBuffer)
   {
      if (classBeingRedefined == null) {
         saveClassfileIfProxyClass(className, classfileBuffer);
      }

      return null;
   }

   private void saveClassfileIfProxyClass(String className, byte[] classfileBuffer)
   {
      String proxyClassName = null;
      int p = className.indexOf("$Proxy");

      if (p >= 0 && Utilities.hasPositiveDigit(className, p + 5)) {
         if (p == 0) {
            proxyClassName = className;
         }
         else if (className.charAt(p - 1) == '/') {
            proxyClassName = className.replace('/', '.');
         }
      }

      if (proxyClassName != null) {
         TestRun.proxyClasses().add(proxyClassName, classfileBuffer);
      }
   }
}