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Java Map Sorter Method Based on Map Values and Comparator

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  1.  
  2. 	/**
  3. 	 * A helper method that sorts the map sent, based on sorting its values 
  4. 	 * using the comparator passed with it
  5. 	 * 
  6. 	 * @param input The map to be sorted
  7. 	 * @param comparator the comparator to be used to sort the map values
  8. 	 * 
  9. 	 * @return A new Sorted HashMap that holds the values 
  10. 	 * 
  11. 	 * @author DKasem
  12. 	 * @since Feb 15, 2010
  13. 	 * @version 0.4.2
  14. 	 */
  15. 	public static <T,E> Map<T, E> sortMap(final Map<T, E> input,Comparator<E> comparator){
  16. 	    Map<T, E> tempMap = new HashMap<T, E>();
  17. 	    for (T wsState : input.keySet()){
  18. 	        tempMap.put(wsState,input.get(wsState));
  19. 	    }
  20.  
  21. 	    List<T> mapKeys = new ArrayList<T>(tempMap.keySet());
  22. 	    List<E> mapValues = new ArrayList<E>(tempMap.values());
  23.  
  24. 	    // Resultant map
  25. 	    HashMap<T, E> sortedMap = new LinkedHashMap<T, E>();
  26.  
  27. 	    List<E> sortedList = new ArrayList<E>(mapValues);
  28. 	    Collections.sort(sortedList,comparator);
  29. 	    for (int i=0; i<sortedList.size(); i++){
  30. 	        sortedMap.put(mapKeys.get(mapValues.indexOf(sortedList.get(i))),(E)sortedList.get(i));
  31. 	    }
  32. 	    return sortedMap;
  33. 	}

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