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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) 2006-2013 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.internal;

import java.lang.instrument.*;
import java.util.*;
import java.util.Map.*;

import org.jetbrains.annotations.*;

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

public final class RedefinitionEngine
{
   @NotNull private Class realClass;

   public RedefinitionEngine() {}
   public RedefinitionEngine(@NotNull Class realClass) { this.realClass = realClass; }

   public static void redefineClasses(@NotNull ClassDefinition... definitions)
   {
      Startup.redefineMethods(definitions);

      MockFixture mockFixture = TestRun.mockFixture();
      
      for (ClassDefinition def : definitions) {
         mockFixture.addRedefinedClass(def.getDefinitionClass(), def.getDefinitionClassFile());
      }
   }

   public void redefineMethodsWhileRegisteringTheClass(@NotNull byte[] modifiedClassfile)
   {
      redefineMethods(modifiedClassfile);
      addToMapOfRedefinedClasses(null, modifiedClassfile);
   }

   private void addToMapOfRedefinedClasses(@Nullable String mockClassInternalName, @NotNull byte[] modifiedClassfile)
   {
      TestRun.mockFixture().addRedefinedClass(mockClassInternalName, realClass, modifiedClassfile);
   }

   private void redefineMethods(@NotNull byte[] modifiedClassfile)
   {
      Startup.redefineMethods(realClass, modifiedClassfile);
   }

   public void redefineMethods(@NotNull Map, byte[]> modifiedClassfiles)
   {
      ClassDefinition[] classDefs = new ClassDefinition[modifiedClassfiles.size()];
      int i = 0;

      for (Entry, byte[]> classAndBytecode : modifiedClassfiles.entrySet()) {
         realClass = classAndBytecode.getKey();
         byte[] modifiedClassfile = classAndBytecode.getValue();

         classDefs[i++] = new ClassDefinition(realClass, modifiedClassfile);
         addToMapOfRedefinedClasses(null, modifiedClassfile);
      }

      Startup.redefineMethods(classDefs);
   }

   public void restoreDefinition(@NotNull Class aClass, @Nullable byte[] previousDefinition)
   {
      if (previousDefinition == null) {
         restoreOriginalDefinition(aClass);
      }
      else {
         restoreToDefinition(aClass, previousDefinition);
      }
   }

   public void restoreOriginalDefinition(@NotNull Class aClass)
   {
      if (!GeneratedClasses.isGeneratedImplementationClass(aClass)) {
         realClass = aClass;
         byte[] realClassFile = ClassFile.createReaderOrGetFromCache(aClass).b;
         redefineMethods(realClassFile);
      }
   }

   private void restoreToDefinition(@NotNull Class aClass, @NotNull byte[] definitionToRestore)
   {
      realClass = aClass;
      redefineMethods(definitionToRestore);
   }

   public void restoreToDefinition(@NotNull String className, @NotNull byte[] definitionToRestore)
   {
      Class aClass = ClassLoad.loadClass(className);
      restoreToDefinition(aClass, definitionToRestore);
   }
}