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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.state;

import java.util.*;

public final class SavePoint
{
   private final Set previousTransformedClasses;
   private final Map, byte[]> previousRedefinedClasses;
   private final int previousMockInstancesCount;

   public SavePoint()
   {
      MockFixture mockFixture = TestRun.mockFixture();
      previousTransformedClasses = mockFixture.getTransformedClasses();
      previousRedefinedClasses = mockFixture.getRedefinedClasses();
      previousMockInstancesCount = TestRun.getMockClasses().getRegularMocks().getInstanceCount();
   }

   public synchronized void rollback()
   {
      MockFixture mockFixture = TestRun.mockFixture();
      mockFixture.restoreTransformedClasses(previousTransformedClasses);
      mockFixture.restoreRedefinedClasses(previousRedefinedClasses);
      TestRun.getMockClasses().getRegularMocks().removeInstances(previousMockInstancesCount);
   }

   public static void registerNewActiveSavePoint()
   {
      TestRun.setSavePointForTestClass(new SavePoint());
   }

   public static void rollbackForTestClass()
   {
      SavePoint savePoint = TestRun.getSavePointForTestClass();

      if (savePoint != null) {
         savePoint.rollback();
         TestRun.setSavePointForTestClass(null);
      }
   }
}