code: @SuppressWarnings("rawtypes")
  	@Override
  	public int doGetClassificationId(Object input) {
  		Object hashValue = input instanceof Entry ? ((Entry)input).getKey() : input;
  
  		int groupId = (hashValue.hashCode() & Integer.MAX_VALUE) % this.getSize();
  		return groupId;
  	}
docs: Returns <i>int</i> representing the result of the hash based classification
  on value <i>input</i>.