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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.mockups;

import java.lang.reflect.*;

import org.jetbrains.annotations.*;

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

public final class MockMethodBridge extends MockingBridge
{
   public static final MockingBridge MB = new MockMethodBridge();

   private MockMethodBridge() { super(MockMethodBridge.class); }

   @Nullable
   public Object invoke(@Nullable Object mocked, Method method, @NotNull Object[] args) throws Throwable
   {
      String mockDesc = (String) args[3];

      if (wasCalledDuringClassLoading()) {
         return DefaultValues.computeForReturnType(mockDesc);
      }

      String mockClassDesc = (String) args[1];

      if (notToBeMocked(mocked, mockClassDesc)) {
         return Void.class;
      }

      boolean callingInstanceMethod = (Boolean) args[0];
      String mockName = (String) args[2];
      int mockStateIndex = (Integer) args[4];
      int mockInstanceIndex = (Integer) args[5];
      boolean startupMock = (Boolean) args[6];
      Object[] mockArgs = extractMockArguments(args);

      return callMock(
         mocked, callingInstanceMethod, mockClassDesc, mockName, mockDesc, mockStateIndex, mockInstanceIndex,
         startupMock, mockArgs);
   }

   @Nullable
   private static Object callMock(
      @Nullable Object mocked, boolean callingInstanceMethod, @NotNull String mockClassInternalName,
      @NotNull String mockName, @NotNull String mockDesc, int mockStateIndex, int mockInstanceIndex,
      boolean startupMock, @NotNull Object[] mockArgs)
      throws Throwable
   {
      Object mock;
      Class mockClass;

      if (callingInstanceMethod) {
         mock = startupMock ? TestRun.getStartupMock(mockInstanceIndex) : TestRun.getMock(mockInstanceIndex);
         assert mock != null;
         mockClass = mock.getClass();
      }
      else {
         mock = mocked;
         String mockClassName = mockClassInternalName.replace('/', '.');
         mockClass = ClassLoad.loadClass(mockClassName);
      }

      Class[] paramClasses = TypeDescriptor.getParameterTypes(mockDesc);
      Method mockMethod = mockStateIndex < 0 ? null :
         TestRun.getMockClasses().getMockStates().getMockMethod(
            mockClassInternalName, mockStateIndex, mockClass, paramClasses);
      MockInvocation invocation = null;

      if (paramClasses.length > 0 && paramClasses[0] == Invocation.class) {
         invocation = TestRun.createMockInvocation(mockClassInternalName, mockStateIndex, mocked, mockArgs);

         if (invocation != null) {
            //noinspection AssignmentToMethodParameter
            mockArgs = ParameterReflection.argumentsWithExtraFirstValue(mockArgs, invocation);
         }
      }

      Object result =
         mockMethod == null ?
            MethodReflection.invokeWithCheckedThrows(mockClass, mock, mockName, paramClasses, mockArgs) :
            MethodReflection.invokeWithCheckedThrows(mock, mockMethod, mockArgs);

      return invocation != null && invocation.shouldProceedIntoConstructor() ? Void.class : result;
   }
}