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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) 2006-2015 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.internal.expectations.injection;

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

import mockit.internal.expectations.mocking.*;
import mockit.internal.state.*;
import mockit.internal.util.*;
import static mockit.internal.expectations.injection.InjectionPoint.*;
import static mockit.internal.util.ConstructorReflection.*;
import static mockit.internal.util.Utilities.*;

final class ConstructorInjection implements Injector
{
   @Nonnull private final TestedClass testedClass;
   @Nonnull private final InjectionState injectionState;
   @Nullable private final FullInjection fullInjection;
   @Nonnull private final Constructor constructor;

   ConstructorInjection(
      @Nonnull TestedClass testedClass, @Nonnull InjectionState injectionState, @Nullable FullInjection fullInjection,
      @Nonnull Constructor constructor)
   {
      this.testedClass = testedClass;
      this.injectionState = injectionState;
      this.fullInjection = fullInjection;
      this.constructor = constructor;
   }

   @Nonnull
   Object instantiate(@Nonnull List parameterProviders)
   {
      Type[] parameterTypes = constructor.getGenericParameterTypes();
      int n = parameterTypes.length;
      Object[] arguments = n == 0 ? NO_ARGS : new Object[n];
      boolean varArgs = constructor.isVarArgs();

      if (varArgs) {
         n--;
      }

      for (int i = 0; i < n; i++) {
         Type parameterType = parameterTypes[i];
         InjectionPointProvider parameterProvider = parameterProviders.get(i);
         Object value;

         if (parameterProvider instanceof MockedType) {
            value = getArgumentValueToInject((MockedType) parameterProvider);
         }
         else {
            assert fullInjection != null;
            injectionState.setTypeOfInjectionPoint(parameterProvider.getDeclaredType());
            String qualifiedParameterName = getQualifiedName(parameterProvider.getAnnotations());
            value = fullInjection.newInstance(testedClass, this, parameterProvider, qualifiedParameterName);

            if (value == null) {
               throw new IllegalArgumentException(
                  "Unable to instantiate argument for constructor parameter: " +
                  parameterType + ' ' + parameterProvider.getName());
            }
         }

         arguments[i] = wrapInProviderIfNeeded(parameterType, value);
      }

      if (varArgs) {
         Type parameterType = parameterTypes[n];
         arguments[n] = obtainInjectedVarargsArray(parameterType);
      }

      TestRun.exitNoMockingZone();

      try {
         return invoke(constructor, arguments);
      }
      finally {
         TestRun.enterNoMockingZone();
      }
   }

   @Nonnull
   private Object obtainInjectedVarargsArray(@Nonnull Type parameterType)
   {
      Type varargsElementType = getTypeOfInjectionPointFromVarargsParameter(parameterType);
      injectionState.setTypeOfInjectionPoint(varargsElementType);

      List