/*  ReflectionTest.java
 *
 *  An example of the reflection properties of Java.  This
 *  example is derived from Example 5-4 in Core Java, Volume I.
 *  Performs the same basic functions as javap (seems faster!).
 *
 *  Bruce M. Bolden
 *  March 10, 1998
 *  http://www.cs.uidaho.edu/~bruceb/
 *
 */


import java.lang.reflect.*;


public class ReflectionTest
{
   public static void main(String[] args)
   {  
      int nArgs = args.length;

      if( nArgs < 1 )
      {
          ShowUsage();
          System.exit(-1);
      }

         //  Process all classes

      for( int i = 0 ; i < nArgs ; ++i )
      {
          if( i > 0 )
              System.out.println( "\n\n" );

          String name = args[i];

          processClass( name );
      }
   }


   /**  Process a single class name  */

   public static void processClass( String name )
   {
      try
      {
         Class cl = Class.forName(name);
         Class sc = cl.getSuperclass();

         System.out.print("class " + name);

         if (sc != null && !sc.equals(Object.class))
            System.out.print("\n    extends " + sc.getName());

         if( sc != null && !sc.equals(Object.class) )
         {
            System.out.print("\n    implements " );

            printInterfaces(cl);
         }

         System.out.print("\n{\n");
         
         System.out.println( "\t//  Constructors" );
         printConstructors(cl);
         System.out.println();

         System.out.println( "\t//  Methods" );
         printMethods(cl);
         System.out.println();

         System.out.println( "\t//  Fields" );
         printFields(cl);
        
         System.out.println("}");
      }
      catch(ClassNotFoundException e)
      {
         System.out.println("Class not found.");
      }
    }


   /**  Show Interfaces implemented by the class  */

   public static void printInterfaces(Class cl)
   {
      Class[] impClasses = cl.getInterfaces();


      for (int i = 0; i < impClasses.length; i++)
      {
         Class c = impClasses[i];
         String name = c.getName();

         if( i > 0 )
             System.out.print(",  " + name );
         else
             System.out.print(" " + name );
      }
   }


   /**  Show Constructors implemented by the class  */

   public static void printConstructors(Class cl)
   {
      Constructor[] constructors = cl.getDeclaredConstructors();


      for (int i = 0; i < constructors.length; i++)
      {
        Constructor c = constructors[i];
         Class[] paramTypes = c.getParameterTypes();
         String name = cl.getName();

         System.out.print(Modifier.toString(c.getModifiers()));
         System.out.print(" " + name + "(");

         for (int j = 0; j < paramTypes.length; j++)
         {
            if (j > 0) System.out.print(", ");
            System.out.print(paramTypes[j].getName());
         }

         System.out.println(");");
      }
   }


   /**  Show Methods implemented by the class  */

   public static void printMethods(Class cl)
   {
      Method[] methods = cl.getDeclaredMethods();

      for (int i = 0; i < methods.length; i++)
      {
         Method m = methods[i];
         Class retType = m.getReturnType();
         Class[] paramTypes = m.getParameterTypes();
         String name = m.getName();

         System.out.print(Modifier.toString(m.getModifiers()));
         System.out.print(" " + retType.getName() + " " + name + "(");

         for (int j = 0; j < paramTypes.length; j++)
         {
            if (j > 0) System.out.print(", ");
            System.out.print(paramTypes[j].getName());
         }

         System.out.println(");");
      }
   }


   /**  Show Fields implemented by the class  */

   public static void printFields(Class cl)
   {
      Field[] fields = cl.getDeclaredFields();

      for (int i = 0; i < fields.length; i++)
      {
         Field f = fields[i];
         Class type = f.getType();
         String name = f.getName();

         System.out.print(Modifier.toString(f.getModifiers()));
         System.out.println(" " + type.getName() + " " + name + ";");
      }
   }


   /**  Show expected argument list  */

   static void ShowUsage()
   {
        System.out.println( "Usage:  java ReflectionTest className[s]" );
   }
}



/*
 * Cay S. Horstmann & Gary Cornell, Core Java
 * Published By Sun Microsystems Press/Prentice-Hall
 * Copyright (C) 1997 Sun Microsystems Inc.
 * All Rights Reserved.
 *
 * Permission to use, copy, modify, and distribute this 
 * software and its documentation for NON-COMMERCIAL purposes
 * and without fee is hereby granted provided that this 
 * copyright notice appears in all copies. 
 * 
 * THE AUTHORS AND PUBLISHER MAKE NO REPRESENTATIONS OR 
 * WARRANTIES ABOUT THE SUITABILITY OF THE SOFTWARE, EITHER 
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A 
 * PARTICULAR PURPOSE, OR NON-INFRINGEMENT. THE AUTHORS
 * AND PUBLISHER SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED 
 * BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING 
 * THIS SOFTWARE OR ITS DERIVATIVES.
 */