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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.util.*;

import org.jetbrains.annotations.*;

public final class AutoBoxing
{
   private static final Map, Class> PRIMITIVE_TO_WRAPPER = new HashMap, Class>();
   private static final Map, Class> WRAPPER_TO_PRIMITIVE = new HashMap, Class>();

   static {
      WRAPPER_TO_PRIMITIVE.put(Boolean.class, boolean.class);
      WRAPPER_TO_PRIMITIVE.put(Character.class, char.class);
      WRAPPER_TO_PRIMITIVE.put(Byte.class, byte.class);
      WRAPPER_TO_PRIMITIVE.put(Short.class, short.class);
      WRAPPER_TO_PRIMITIVE.put(Integer.class, int.class);
      WRAPPER_TO_PRIMITIVE.put(Float.class, float.class);
      WRAPPER_TO_PRIMITIVE.put(Long.class, long.class);
      WRAPPER_TO_PRIMITIVE.put(Double.class, double.class);

      PRIMITIVE_TO_WRAPPER.put(boolean.class, Boolean.class);
      PRIMITIVE_TO_WRAPPER.put(char.class, Character.class);
      PRIMITIVE_TO_WRAPPER.put(byte.class, Byte.class);
      PRIMITIVE_TO_WRAPPER.put(short.class, Short.class);
      PRIMITIVE_TO_WRAPPER.put(int.class, Integer.class);
      PRIMITIVE_TO_WRAPPER.put(float.class, Float.class);
      PRIMITIVE_TO_WRAPPER.put(long.class, Long.class);
      PRIMITIVE_TO_WRAPPER.put(double.class, Double.class);
   }

   public static boolean isWrapperOfPrimitiveType(@NotNull Class type)
   {
      return WRAPPER_TO_PRIMITIVE.containsKey(type);
   }

   @Nullable public static Class getPrimitiveType(@NotNull Class wrapperType)
   {
      return WRAPPER_TO_PRIMITIVE.get(wrapperType);
   }

   @Nullable public static Class getWrapperType(@NotNull Class primitiveType)
   {
      return PRIMITIVE_TO_WRAPPER.get(primitiveType);
   }
}