/**
 * 
 */
package de.fhswf.in.inf.java1.aufgabe10;

import java.util.concurrent.ConcurrentSkipListMap;

/**
 * Counts the words in one line.
 *
 * @author $Author: $
 * @version $Revision: $, $Date: $ UTC
 */
public class LineWordCount implements Runnable
{

   private String[] lineArray;

   private ConcurrentSkipListMap<String, Integer> lineWordMap;

   private static final Integer NEWVALUE = new Integer(1);

   /**
    * Creates the object which will be threaded.
    *
    * @param wordMap
    *           The wordMap into which the counts should be added.
    * @param line
    *           The line to be counted.
    */
   public LineWordCount(ConcurrentSkipListMap<String, Integer> wordMap,
         String line)
   {
      if (wordMap == null)
      {
         throw new IllegalArgumentException("WordMap can't be null.");
      }
      if (line == null)
      {
         throw new IllegalArgumentException("Line can't be null.");
      }
      if (line.isEmpty())
      {
         throw new IllegalArgumentException("Line can't be empty.");
      }
      lineWordMap = wordMap;
      lineArray = line.split("[^\\p{IsAlphabetic}\\p{Digit}]+");
   }

   /*
    * (non-Javadoc)
    * 
    * @see java.lang.Runnable#run()
    */
   @Override
   public final void run()
   {
      for (String word : lineArray)
      {
         // Split creates empty String, if first char is a split char.
         if (!word.isEmpty())
         {
            word = word.toLowerCase();
            boolean success;

            do
            {
               success = true;
               Integer tmp = lineWordMap.putIfAbsent(word, NEWVALUE);
               if (tmp != null)
               {
                  success = lineWordMap.replace(word, tmp, tmp + 1);
               }
            }
            while (!success);
         }
      }
   }
}