Java SDK: non-Enum POJO types

public class AntplusDeviceType  {
    public static final short ANTFS = 1;
    public static final short BIKE_POWER = 11;
    public static final short ENVIRONMENT_SENSOR_LEGACY = 12;
    public static final short MULTI_SPORT_SPEED_DISTANCE = 15;
    // ...
    public static final short INVALID = Fit.UINT8_INVALID;

    private static final Map<Short, String> stringMap;

    static {
        stringMap = new HashMap<Short, String>();
        stringMap.put(ANTFS, "ANTFS");
        stringMap.put(BIKE_POWER, "BIKE_POWER");
        stringMap.put(ENVIRONMENT_SENSOR_LEGACY, "ENVIRONMENT_SENSOR_LEGACY");
        stringMap.put(MULTI_SPORT_SPEED_DISTANCE, "MULTI_SPORT_SPEED_DISTANCE");
        // ...
    }

    public static String getStringFromValue( Short value ) {
        if( stringMap.containsKey( value ) ) {
            return stringMap.get( value );
        }
        return "";
    }

    public static Short getValueFromString( String value ) {
        for( Map.Entry<Short, String> entry : stringMap.entrySet() ) {
            if( entry.getValue().equals( value ) ) {
                return entry.getKey();
            }
        }
        return INVALID;
    }
}

public enum AntplusDeviceType() {
    ANTFS((short)1),
    BIKE_POWER((short)11),
    ENVIRONMENT_SENSOR_LEGACY((short)12),
    MULTI_SPORT_SPEED_DISTANCE((short)15),
    // ...
    INVALID(Fit.UINT8_INVALID);

    protected short value;

    private AntplusDeviceType(short value) {
        this.value = value;
    }

    // new implementation; same signature
    public static String getStringFromValue( Short value ) {
        return getByValue(value).name();
    }

    // new implementation; same signature
    public static Short getValueFromString( String value ) {
        for (final AntplusDeviceType type : AntplusDeviceType.values()) {
            if (value.equals(type.name()))
                return type.value;
        }
        return AntplusDeviceType.INVALID.value;
    }

    // fully new
    public static AntplusDeviceType getByValue(final Short value) {
        for (final AntplusDeviceType type : AntplusDeviceType.values()) {
            if (value == type.value)
                return type;
        }
        return AntplusDeviceType.INVALID;
    }

    // fully new
    public static String getStringFromValue( AntplusDeviceType value ) {
        return value.name();
    }

    // fully new
    public short getValue() {
        return value;
    }

}