@Type(
            type = "com.gl.data.types.EnumUserType",
            parameters = {@Parameter(name = "enumClassName", value = "com.gl.moneta.PurchaseState")}
    )
    public PurchaseState getPurchaseState() {
        return purchaseState;
    }

public class EnumUserType implements EnhancedUserType, ParameterizedType {

    private Class<Enum> enumClass;

    public void setParameterValues(Properties parameters) {
        String enumClassName = parameters.getProperty("enumClassName");
        try {
            enumClass = (Class<Enum>)Class.forName(enumClassName);
        }
        catch (ClassNotFoundException cnfe) {
            throw new HibernateException("Enum class not found", cnfe);
        }
    }

    public Object assemble(Serializable cached, Object owner)
            throws HibernateException {
        return cached;
    }

    public Object deepCopy(Object value) throws HibernateException {
        return value;
    }

    public Serializable disassemble(Object value) throws HibernateException {
        return (Enum)value;
    }

    public boolean equals(Object x, Object y) throws HibernateException {
        return x == y;
    }

    public int hashCode(Object x) throws HibernateException {
        return x.hashCode();
    }

    public boolean isMutable() {
        return false;
    }

    public Object nullSafeGet(ResultSet rs, String[] names, Object owner)
            throws HibernateException, SQLException {
        String name = rs.getString(names[0]);
        return rs.wasNull() ? null : Enum.valueOf(enumClass, name);
    }

    public void nullSafeSet(PreparedStatement st, Object value, int index)
            throws HibernateException, SQLException {
        if (value == null) {
            st.setNull(index, Types.VARCHAR);
        } else {
            st.setString(index, ((Enum)value).name());
        }
    }

    public Object replace(Object original, Object target, Object owner)
            throws HibernateException {
        return original;
    }

    public Class returnedClass() {
        return enumClass;
    }

    public int[] sqlTypes() {
        return new int[]{Types.VARCHAR};
    }

    public Object fromXMLString(String xmlValue) {
        return Enum.valueOf(enumClass, xmlValue);
    }

    public String objectToSQLString(Object value) {
        return '\'' + ((Enum)value).name() + '\'';
    }

    public String toXMLString(Object value) {
        return ((Enum)value).name();
    }

}