mybatis enum handler

CodeEnumTypeHandler.java

public class CodeEnumTypeHandler<E extends Enum<E> & CodeEnum> extends BaseTypeHandler<CodeEnum>
{
	private Class<E> type;

	public CodeEnumTypeHandler(Class<E> type) {
		if (type == null) {
			throw new IllegalArgumentException("Type argument cannot be null");
		}
		this.type = type;
	}

	@Override
	public void setNonNullParameter(PreparedStatement ps, int i, CodeEnum parameter, JdbcType jdbcType)
			throws SQLException {
		ps.setInt(i, parameter.getCode());
	}

	@Override
	public E getNullableResult(ResultSet rs, String columnName) throws SQLException {
		int code = rs.getInt(columnName);
		return rs.wasNull() ? null : codeOf(code);
	}

	@Override
	public E getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
		int code = rs.getInt(columnIndex);
		return rs.wasNull() ? null : codeOf(code);
	}

	@Override
	public E getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
		int code = cs.getInt(columnIndex);
		return cs.wasNull() ? null : codeOf(code);
	}

	private E codeOf(int code){
		try {
			return CodeEnumUtil.codeOf(type, code);
		} catch (Exception ex) {
			throw new IllegalArgumentException("Cannot convert " + code + " to " + type.getSimpleName() + " by code value.", ex);
		}
	}
}