package org.djutils.primitives;
   
   /**
    * The Primitive class is a utility class to deal with primitives. Besides widening and unwidening this class casts and parses
    * UTF8 strings into appropriate primitive classes.
    * <p>
    * Copyright (c) 2002-2020 Delft University of Technology, Jaffalaan 5, 2628 BX Delft, the Netherlands. All rights reserved. See
    * for project information <a href="https://djutils.org" target="_blank"> https://djutils.org</a>. The DJUTILS project is
    * distributed under a three-clause BSD-style license, which can be found at
   * <a href="https://djutils.org/docs/license.html" target="_blank"> https://djutils.org/docs/license.html</a>.
   * </p>
   * @author <a href="https://www.linkedin.com/in/peterhmjacobs">Peter Jacobs </a>
   */
  public final class Primitive
  {
      /**
       * Utility class should not be instantiated.
       */
      private Primitive()
      {
          // Do not instantiate
      }
  
      /**
       * casts a set of values to classes.
       * @param classes Class&lt;?&gt;[]; the classes to cast to
       * @param values Object[]; the values
       * @return the newly creates values
       */
      public static Object[] cast(final Class<?>[] classes, final Object[] values)
      {
          for (int i = 0; i < classes.length; i++)
          {
              values[i] = Primitive.cast(classes[i], values[i]);
          }
          return values;
      }
  
      /**
       * casts an object to a instance of clazz.
       * @param clazz Class&lt;?&gt;; the class to cast to
       * @param object Object; the object to cast
       * @return Object; the casted object
       */
      public static Object cast(final Class<?> clazz, final Object object)
      {
          if (clazz.isInstance(object) || !clazz.isPrimitive() || (clazz.equals(Primitive.getPrimitive(object.getClass()))))
          {
              return object;
          }
  
          // Boolean
          if (clazz.equals(boolean.class))
          {
              return Primitive.toBoolean(object);
          }
  
          // Character
          if (clazz.equals(char.class))
          {
              return Primitive.toCharacter(object);
          }
  
          // Byte
          if (clazz.equals(byte.class))
          {
              return Primitive.toByte(object);
          }
  
          // Double
          if (clazz.equals(double.class))
          {
              return Primitive.toDouble(object);
          }
  
          // Float
          if (clazz.equals(float.class))
          {
              return Primitive.toFloat(object);
          }
  
          // Long
          if (clazz.equals(long.class))
          {
              return Primitive.toLong(object);
          }
  
          // Integer
          if (clazz.equals(int.class))
          {
              return Primitive.toInteger(object);
          }
  
          // Short
          if (clazz.equals(short.class))
          {
              return Primitive.toShort(object);
          }
          return object;
     }
 
     /**
      * returns the primitiveClass of the name given as defined by the Java VM class constants. (i.e. both "int" and "I" return
      * int.class). Both void and "V" return void.class. null is returned whenever an unknown className is given.
      * @param className String; the className
      * @return Class the primitiveClass
      */
     public static Class<?> forName(final String className)
     {
         if (className.equals("int") || className.equals("I"))
         {
             return int.class;
         }
         if (className.equals("double") || className.equals("D"))
         {
             return double.class;
         }
         if (className.equals("byte") || className.equals("B"))
         {
             return byte.class;
         }
         if (className.equals("float") || className.equals("F"))
         {
             return float.class;
         }
         if (className.equals("long") || className.equals("J"))
         {
             return long.class;
         }
         if (className.equals("boolean") || className.equals("Z"))
         {
             return boolean.class;
         }
         if (className.equals("char") || className.equals("C"))
         {
             return char.class;
         }
         if (className.equals("short") || className.equals("S"))
         {
             return short.class;
         }
         if (className.equals("void") || className.equals("V"))
         {
             return void.class;
         }
         return null;
     }
 
     /**
      * gets the primitive of the given wrapperClass.
      * @param wrapperClass Class&lt;?&gt;; the wrapper class
      * @return the primitive Class. null is returned whenever wrapperClass is not a wrapperclass.
      */
     public static Class<?> getPrimitive(final Class<?> wrapperClass)
     {
         if (wrapperClass.equals(Integer.class))
         {
             return int.class;
         }
         if (wrapperClass.equals(Double.class))
         {
             return double.class;
         }
         if (wrapperClass.equals(Byte.class))
         {
             return byte.class;
         }
         if (wrapperClass.equals(Float.class))
         {
             return float.class;
         }
         if (wrapperClass.equals(Long.class))
         {
             return long.class;
         }
         if (wrapperClass.equals(Boolean.class))
         {
             return boolean.class;
         }
         if (wrapperClass.equals(Character.class))
         {
             return char.class;
         }
         if (wrapperClass.equals(Short.class))
         {
             return short.class;
         }
         return null;
     }
 
     /**
      * gets the wrapper of this primitive class.
      * @param primitiveClass Class&lt;?&gt;; the primitive class
      * @return the Class. null is returned whenever wrapperClass is not a wrapperclass.
      */
     public static Class<?> getWrapper(final Class<?> primitiveClass)
     {
         if (primitiveClass.equals(int.class))
         {
             return Integer.class;
         }
         if (primitiveClass.equals(double.class))
         {
             return Double.class;
         }
         if (primitiveClass.equals(byte.class))
         {
             return Byte.class;
         }
         if (primitiveClass.equals(float.class))
         {
             return Float.class;
         }
         if (primitiveClass.equals(long.class))
         {
             return Long.class;
         }
         if (primitiveClass.equals(boolean.class))
         {
             return Boolean.class;
         }
         if (primitiveClass.equals(char.class))
         {
             return Character.class;
         }
         if (primitiveClass.equals(short.class))
         {
             return Short.class;
         }
         throw new IllegalArgumentException(primitiveClass + " != primitive");
     }
 
     /**
      * casts an object to Boolean.
      * @param object Object; the object
      * @return Boolean
      */
     public static Boolean toBoolean(final Object object)
     {
         if (object instanceof Number)
         {
             int value = ((Number) object).intValue();
             if (value == 1)
             {
                 return Boolean.TRUE;
             }
             if (value == 0)
             {
                 return Boolean.FALSE;
             }
             throw new IllegalArgumentException("object.intValue !=0 && !=1");
         }
         return (Boolean) object;
     }
 
     /**
      * casts an object to Byte.
      * @param object Object; the object
      * @return Byte
      */
     public static Byte toByte(final Object object)
     {
         if (object instanceof Number)
         {
             return Byte.valueOf(((Number) object).byteValue());
         }
         return (Byte) object;
     }
 
     /**
      * casts an object to Character.
      * @param object Object; the object to parse
      * @return Integer the result
      */
     public static Character toCharacter(final Object object)
     {
         if (object instanceof Number)
         {
             return Character.valueOf((char) ((Number) object).byteValue());
         }
         return (Character) object;
     }
 
     /**
      * casts an object to Double.
      * @param object Object; the object to parse
      * @return Integer the result
      */
     public static Double toDouble(final Object object)
     {
         return Double.valueOf(((Number) object).doubleValue());
     }
 
     /**
      * casts an object to Float.
      * @param object Object; the object to parse
      * @return Float the result
      */
     public static Float toFloat(final Object object)
     {
         return Float.valueOf(((Number) object).floatValue());
     }
 
     /**
      * casts an object to Long.
      * @param object Object; the object to parse
      * @return Long the result
      */
     public static Long toLong(final Object object)
     {
         return Long.valueOf(((Number) object).longValue());
     }
 
     /**
      * casts an object to Short.
      * @param object Object; the object to parse
      * @return Long the result
      */
     public static Short toShort(final Object object)
     {
         return Short.valueOf(((Number) object).shortValue());
     }
 
     /**
      * casts an object to Integer.
      * @param object Object; the object to parse
      * @return Integer the result
      */
     public static Integer toInteger(final Object object)
     {
         if (object instanceof Character)
         {
             return Integer.valueOf(((Character) object).charValue());
         }
         if (object instanceof Boolean)
         {
             if (((Boolean) object).booleanValue())
             {
                 return Integer.valueOf(1);
             }
             return Integer.valueOf(0);
         }
         return Integer.valueOf(((Number) object).intValue());
     }
 
     /**
      * Returns true when the first class is assignable from the second class, e.g. when firstClass is Number and secondClass is
      * Integer, the result is true (a number is assignable from an integer, i.e. Number n = Integer.valueOf(4) will work, but
      * Integer i = new Number(4) will not work). This method also takes into account primitive types, so when firstClass is
      * Number, and secondClass is int, the result is true, or when the firstClass is int, and the second class is Integer /
      * firstClass is Integer and secondClass is int, the result will also be true.
      * @param firstClass the class to which secondClass should be assignable
      * @param secondClass the class from which firstClass should be assignable
      * @return firstClass.isAssignableFrom(secondClass) taking into acount primitive types
      */
     public static boolean isPrimitiveAssignableFrom(final Class<?> firstClass, final Class<?> secondClass)
     {
         boolean result = firstClass.isAssignableFrom(secondClass);
         if (!result)
         {
             if (firstClass.isPrimitive())
             {
                 result = getWrapper(firstClass).isAssignableFrom(secondClass);
             }
             if (!result)
             {
                 if (secondClass.isPrimitive())
                 {
                     result = firstClass.isAssignableFrom(getWrapper(secondClass));
                 }
             }
         }
         return result;
     }
 }