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JMockit is a Java toolkit for automated developer testing. It contains mocking/faking APIs and a code coverage tool, 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 JMockit developers
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.internal.faking;

import java.lang.reflect.*;
import java.util.*;
import java.util.Map.*;
import javax.annotation.*;

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

public final class FakeClasses
{
   private static final Method ON_TEAR_DOWN_METHOD;
   static {
      try {
         ON_TEAR_DOWN_METHOD = MockUp.class.getDeclaredMethod("onTearDown");
         ON_TEAR_DOWN_METHOD.setAccessible(true);
      }
      catch (NoSuchMethodException e) { throw new RuntimeException(e); }
   }

   private static void notifyOfTearDown(@Nonnull MockUp fake) {
      try { ON_TEAR_DOWN_METHOD.invoke(fake); }
      catch (IllegalAccessException ignore) {}
      catch (InvocationTargetException e) { e.getCause().printStackTrace(); }
   }

   @Nonnull private final Map> startupFakes;
   @Nonnull private final Map, MockUp> fakeClassesToFakeInstances;
   @Nonnull public final FakeStates fakeStates;

   public FakeClasses() {
      startupFakes = new IdentityHashMap<>(8);
      fakeClassesToFakeInstances = new IdentityHashMap<>();
      fakeStates = new FakeStates();
   }

   void addFake(@Nonnull String fakeClassDesc, @Nonnull MockUp fake) {
      startupFakes.put(fakeClassDesc, fake);
   }

   void addFake(@Nonnull MockUp fake) {
      Class fakeClass = fake.getClass();
      fakeClassesToFakeInstances.put(fakeClass, fake);
   }

   @Nonnull
   public MockUp getFake(@Nonnull String fakeClassDesc) {
      MockUp startupFake = startupFakes.get(fakeClassDesc);

      if (startupFake != null) {
         return startupFake;
      }

      Class fakeClass = ClassLoad.loadByInternalName(fakeClassDesc);
      MockUp fakeInstance = fakeClassesToFakeInstances.get(fakeClass);
      return fakeInstance;
   }

   @Nullable
   public MockUp findPreviouslyAppliedFake(@Nonnull MockUp newFake) {
      Class fakeClass = newFake.getClass();
      MockUp fakeInstance = fakeClassesToFakeInstances.get(fakeClass);
      return fakeInstance;
   }

   private void discardFakeInstancesExceptPreviousOnes(@Nonnull Map, Boolean> previousFakeClasses) {
      for (Entry, MockUp> fakeClassAndInstances : fakeClassesToFakeInstances.entrySet()) {
         Class fakeClass = fakeClassAndInstances.getKey();

         if (!previousFakeClasses.containsKey(fakeClass)) {
            MockUp fakeInstance = fakeClassAndInstances.getValue();
            notifyOfTearDown(fakeInstance);
         }
      }

      fakeClassesToFakeInstances.keySet().retainAll(previousFakeClasses.keySet());
   }

   private void discardAllFakeInstances() {
      if (!fakeClassesToFakeInstances.isEmpty()) {
         for (MockUp fakeInstance : fakeClassesToFakeInstances.values()) {
            notifyOfTearDown(fakeInstance);
         }

         fakeClassesToFakeInstances.clear();
      }
   }

   public void discardStartupFakes() {
      for (MockUp startupFake : startupFakes.values()) {
         notifyOfTearDown(startupFake);
      }
   }

   public final class SavePoint {
      @Nonnull private final Map, Boolean> previousFakeClasses;

      public SavePoint() {
         previousFakeClasses = new IdentityHashMap<>();

         for (Entry, MockUp> fakeClassAndInstance : fakeClassesToFakeInstances.entrySet()) {
            Class fakeClass = fakeClassAndInstance.getKey();
            previousFakeClasses.put(fakeClass, false);
         }
      }

      public void rollback() {
         if (previousFakeClasses.isEmpty()) {
            discardAllFakeInstances();
         }
         else {
            discardFakeInstancesExceptPreviousOnes(previousFakeClasses);
         }
      }
   }
}