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Proximo provides a simple declarative means for creating proxies and stubbing method behavior overrides.
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/**
 * Copyright 2015 XpertSoftware
 * 
 * Created By: cfloersch
 * Date: 6/7/2015
 */
package org.xpertss.proximo.util;

import java.util.HashMap;
import java.util.Map;

@SuppressWarnings("unchecked")
public class Primitives {


   private static final Map, Class> WRAPPER_TYPES = new HashMap, Class>();
   private static final Map, Class> PRIMITIVE_TYPES = new HashMap, Class>();
   private static final Map, Object> PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES = new HashMap, Object>();


   public static  Class wrapperTypeFor(Class clazz) {
      if (!clazz.isPrimitive()) {
         return clazz;
      }
      return (Class) WRAPPER_TYPES.get(clazz);
   }

   /**
    * Returns the primitive type of the given class.
    * 
    * The passed class can be any class : boolean.class, Integer.class
    * in witch case this method will return boolean.class, even SomeObject.class
    * in which case null will be returned.
    *
    * @param clazz The class from which primitive type has to be retrieved
    * @param    The type
    * @return The primitive type if relevant, otherwise null
    */
   public static  Class primitiveTypeOf(Class clazz) {
      if (clazz.isPrimitive()) {
         return clazz;
      }
      return (Class) PRIMITIVE_TYPES.get(clazz);
   }

   /**
    * Indicates if the given class is primitive type or a primitive wrapper.
    *
    * @param type The type to check
    * @return true if primitive or wrapper, false otherwise.
    */
   public static boolean isPrimitiveOrWrapper(Class type) {
      return PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.containsKey(type);
   }

   /**
    * Returns the boxed default value for a primitive or a primitive wrapper.
    *
    * @param primitiveOrWrapperType The type to lookup the default value
    * @return The boxed default values as defined in Java Language Specification,
    *         null if the type is neither a primitive nor a wrapper
    */
   public static  T defaultValueForPrimitiveOrWrapper(Class primitiveOrWrapperType) {
      return (T) PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.get(primitiveOrWrapperType);
   }


   static {
      WRAPPER_TYPES.put(Boolean.TYPE, Boolean.class);
      WRAPPER_TYPES.put(Character.TYPE, Character.class);
      WRAPPER_TYPES.put(Byte.TYPE, Byte.class);
      WRAPPER_TYPES.put(Short.TYPE, Short.class);
      WRAPPER_TYPES.put(Integer.TYPE, Integer.class);
      WRAPPER_TYPES.put(Long.TYPE, Long.class);
      WRAPPER_TYPES.put(Float.TYPE, Float.class);
      WRAPPER_TYPES.put(Double.TYPE, Double.class);
      WRAPPER_TYPES.put(Void.TYPE, void.class);
   }

   static {
      PRIMITIVE_TYPES.put(Boolean.class, Boolean.TYPE);
      PRIMITIVE_TYPES.put(Character.class, Character.TYPE);
      PRIMITIVE_TYPES.put(Byte.class, Byte.TYPE);
      PRIMITIVE_TYPES.put(Short.class, Short.TYPE);
      PRIMITIVE_TYPES.put(Integer.class, Integer.TYPE);
      PRIMITIVE_TYPES.put(Long.class, Long.TYPE);
      PRIMITIVE_TYPES.put(Float.class, Float.TYPE);
      PRIMITIVE_TYPES.put(Double.class, Double.TYPE);
      PRIMITIVE_TYPES.put(void.class, Void.TYPE);
   }

   static {
      PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.put(Boolean.class, false);
      PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.put(Character.class, '\u0000');
      PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.put(Byte.class, (byte) 0);
      PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.put(Short.class, (short) 0);
      PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.put(Integer.class, 0);
      PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.put(Long.class, 0L);
      PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.put(Float.class, 0F);
      PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.put(Double.class, 0D);

      PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.put(boolean.class, false);
      PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.put(char.class, '\u0000');
      PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.put(byte.class, (byte) 0);
      PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.put(short.class, (short) 0);
      PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.put(int.class, 0);
      PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.put(long.class, 0L);
      PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.put(float.class, 0F);
      PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.put(double.class, 0D);
   }

}