/*
 * CharCountHomework.java
 *
 * Simple demo of yet another letter-histogram homework assignment.
 *
 * Copyright 2003, Matt Gerrans.
 *
 * Turning in this code as homework is a violation of ethical principals,
 * and punishable by severe penalties, even if you change the variable
 * names.
 */
class CharCountHomework
{
   /**
    * Returns the "histogram" of characters for the String.
    */
   public static int [] getCharProfile( String s )
   {
      int [] results = new int[26];
 
      for( int i = 0; i < s.length(); i++ )
         if( Character.isLetter(s.charAt(i)) )
            results[(int)(Character.toLowerCase(s.charAt(i))-'a')]++;
      return results;
   }
 
   /**
    * Prints the list of character frequencies in the specified
    * string to the specified PrintStream destination.
    */
   public static void printProfile( String text, java.io.PrintStream destination )
   {
      int [] profile = getCharProfile(text);
 
      destination.println( "Profile of \"" + text + "\":" );
      for( int i = 0; i < profile.length; i++ )
         destination.print( (i>0?", ":"") +(char)('a'+i) + ":" + profile[i] );
      destination.println(".");
   }
 
   /**
    * Assembles all the separate parts of the command line arguments
    * array into one String and returns it.
    * 
    * If the args array is empty, it just returns
    *   "The quick brown fox jumps over the lazy dog"
    * which is a pretty handy string for test input.
    */
   public static String assembleCommandLineText(String args[])
   {
      String text = "The quick brown fox jumps over the lazy dog";
      if( args.length > 0 )
      {
         StringBuffer buffy = new StringBuffer( args[0] );
         for( int i = 0; i < args.length; i++ )
         {
            buffy.append( " " );
            buffy.append( args[i] );
         }
         text = buffy.toString();
      }
      return text;
   }
 
   /**
    * Prints (to System.out) out a profile of the letters a test string.
    * The stirng could be specified on the command line, but if
    * nothing is specified, the default string will suffice.
    */
   public static void main(String args[])
   {
      printProfile( assembleCommandLineText(args), System.out );
   }
}