code: @SuppressWarnings("rawtypes")
  	@Override
  	protected Object convertToType(Class type, Object value) throws Throwable {
  		try {
  			return new Rating(Integer.parseInt(value.toString()));
  		} catch (Exception e) {
  			throw new ConversionException(
  					"Cannot parse Rating value into integer [" + value + "]");
  		}
  	}
docs: Converts the specified value to
  {@code com.google.appengine.api.datastore.Rating}.
  
  @see org.apache.commons.beanutils.converters.AbstractConverter#convertToType(java.lang.Class, java.lang.Object)