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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 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); }

   public Object invoke(Object mocked, Method method, 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);
   }

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

      if (callingInstanceMethod) {
         mock = startupMock ? TestRun.getStartupMock(mockInstanceIndex) : TestRun.getMock(mockInstanceIndex);
         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);
         //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;
   }
}