Example of enumeration, if you want to save in database to be some value of your enum. Just override getId(), returning what you want.

LogType.groovy

/**
 * @author Daniel Moura
 *
 */
public enum LogType {
 
	CHANGE('C', 'Change'),
	INCLUSION('I', 'Inclusion'),
	EXCLUSION('E', 'Exclusion')
 
	final String key
	final String value
 
	/**
	 * @param key
	 * @param value
	 */
	LogType(String key, String value) {
		this.key = key
		this.value = value
	}
	
	@Override
	public String toString() {
		value
	}
	
	/**
	 * @return
	 */
	public String getId() {
		key
	}
	
}