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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.util;

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

import org.jetbrains.annotations.*;

public final class ParameterReflection
{
   static final Class[] NO_PARAMETERS = new Class[0];

   @NotNull static String getParameterTypesDescription(@NotNull Type[] paramTypes)
   {
      String paramTypesDesc = Arrays.asList(paramTypes).toString();
      return paramTypesDesc.replace("class ", "").replace('[', '(').replace(']', ')');
   }

   @NotNull public static Class[] getArgumentTypesFromArgumentValues(@NotNull Object... args)
   {
      if (args.length == 0) {
         return NO_PARAMETERS;
      }

      Class[] argTypes = new Class[args.length];

      for (int i = 0; i < args.length; i++) {
         argTypes[i] = getArgumentTypeFromArgumentValue(i, args);
      }

      return argTypes;
   }

   @NotNull private static Class getArgumentTypeFromArgumentValue(int i, @NotNull Object[] args)
   {
      Object arg = args[i];

      if (arg == null) {
         throw new IllegalArgumentException("Invalid null value passed as argument " + i);
      }

      Class argType;

      if (arg instanceof Class) {
         argType = (Class) arg;
         args[i] = null;
      }
      else {
         argType = GeneratedClasses.getMockedClass(arg);
      }

      return argType;
   }

   @NotNull public static Object[] argumentsWithExtraFirstValue(@NotNull Object[] args, @NotNull Object firstValue)
   {
      Object[] args2 = new Object[1 + args.length];
      args2[0] = firstValue;
      System.arraycopy(args, 0, args2, 1, args.length);
      return args2;
   }

   static boolean hasMoreSpecificTypes(@NotNull Class[] currentTypes, @NotNull Class[] previousTypes)
   {
      for (int i = 0; i < currentTypes.length; i++) {
         Class current = wrappedIfPrimitive(currentTypes[i]);
         Class previous = wrappedIfPrimitive(previousTypes[i]);

         if (current != previous && previous.isAssignableFrom(current)) {
            return true;
         }
      }

      return false;
   }

   @NotNull private static Class wrappedIfPrimitive(@NotNull Class parameterType)
   {
      if (parameterType.isPrimitive()) {
         Class wrapperType = AutoBoxing.getWrapperType(parameterType);
         assert wrapperType != null;
         return wrapperType;
      }

      return parameterType;
   }

   static boolean acceptsArgumentTypes(@NotNull Class[] paramTypes, @NotNull Class[] argTypes, int firstParameter)
   {
      for (int i = firstParameter; i < paramTypes.length; i++) {
         Class parType = paramTypes[i];
         Class argType = argTypes[i - firstParameter];

         if (isSameTypeIgnoringAutoBoxing(parType, argType) || parType.isAssignableFrom(argType)) {
            // OK, move to next parameter.
         }
         else {
            return false;
         }
      }

      return true;
   }

   static boolean isSameTypeIgnoringAutoBoxing(@NotNull Class firstType, @NotNull Class secondType)
   {
      return
         firstType == secondType ||
         firstType.isPrimitive() && isWrapperOfPrimitiveType(firstType, secondType) ||
         secondType.isPrimitive() && isWrapperOfPrimitiveType(secondType, firstType);
   }

   private static boolean isWrapperOfPrimitiveType(@NotNull Class primitiveType, @NotNull Class otherType)
   {
      return primitiveType == AutoBoxing.getPrimitiveType(otherType);
   }

   static int indexOfFirstRealParameter(@NotNull Class[] mockParameterTypes, @NotNull Class[] realParameterTypes)
   {
      int extraParameters = mockParameterTypes.length - realParameterTypes.length;

      if (extraParameters == 1) {
         //noinspection UnnecessaryFullyQualifiedName
         return mockParameterTypes[0] == mockit.Invocation.class ? 1 : -1;
      }
      else if (extraParameters != 0) {
         return -1;
      }

      return 0;
   }

   static boolean matchesParameterTypes(
      @NotNull Class[] declaredTypes, @NotNull Class[] specifiedTypes, int firstParameter)
   {
      for (int i = firstParameter; i < declaredTypes.length; i++) {
         Class declaredType = declaredTypes[i];
         Class specifiedType = specifiedTypes[i - firstParameter];

         if (isSameTypeIgnoringAutoBoxing(declaredType, specifiedType)) {
            // OK, move to next parameter.
         }
         else {
            return false;
         }
      }

      return true;
   }
}