public class FrequencyDictionaryImp extends DictionaryImp implements Dictionary {
	//Data
	private boolean created;
	private int count;
	
	//Constructor
	public FrequencyDictionaryImp(Function table) {
		super(table);
		created = false;
		count = 0;
	}

	//Public method
	public FrequencyDictionaryImp create() {
		java.util.Iterator it = super.keys();
    	while (it.hasNext()) {
      		String word = (String)(it.next());
      		Object value = get(word);
      		double frequency = ((Double)value).doubleValue() / count;
      		super.put(word,(new Double(frequency)));
      	}

      	created = true;
    	return this;
  	}

	//Dictionary methods - inherited from DictionaryImp

	//Override method
  	public Object put(String word,Object value) {
  		if(created) throw new UnsupportedOperationException("Dictionary is created!");
  		Double valueNew = ((Double)value);
  		count += valueNew;
     	Object valueOld = super.get(word);
     	if(valueOld != null)
     		valueNew = new Double(((Double)valueOld).doubleValue() + ((Double)valueNew).doubleValue());
     	super.put(word,valueNew);
		return valueNew;
  	}
}