Update of PercentType shows incorrect value

[patrick023 (Patrick)]

Hi,

currently I am trying to update the state of an item with type Number:Dimensionless. The logging shows that I get the correct number (19) but when I update the state of my item a value of 0.19 is shown.
Is this the intended behavior for percentage values?
If yes could you please give me a hint how I can format it in the UI to show it as ‘19 %’?

2023-04-02 14:32:20.184 [INFO ] [inding.devolo.internal.DevoloHandler] - try to update channel stats-cpu
2023-04-02 14:32:20.184 [INFO ] [inding.devolo.internal.DevoloHandler] - new value 19 for channel stats-cpu
2023-04-02 14:32:20.185 [INFO ] [inding.devolo.internal.DevoloHandler] - int value 19 for channel stats-cpu

In code I set the value as follows:

...
case STATS_CPU_CHANNEL:
    value = dataState.getProperty(STATS_CPU_KEY);
    logger.info("new value {} for channel {}", value, channelID);
    int cpuLoad = Integer.valueOf(value);
    logger.info("int value {} for channel {}", cpuLoad, channelID);
    state = new PercentType(cpuLoad);
    updateState(channelID, state);
    break;

Thank you for your help

Best regards,
Patrick

[mstormi (Markus Storm)]

@patrick023

Is this the intended behavior for percentage values?

Yes. 19% is 0.19 and no unit.

@patrick023

If yes could you please give me a hint how I can format it in the UI to show it as ‘19 %’?

Add a literal ‘%’ to your log command.
Don’t confuse your debug output with all the conversion stuff going on when you display an item in a widget or sitemap.

[patrick023 (Patrick)]

Thank you for the fast reply.

I don’t want to add the ‘%’ to my log comments.
I would like that the state of the item is displayed as ‘19 %’ in a UI widget.
Changing the state description pattern for example to ‘%d%%’ (with or without a space) still shows 0.19.
Any idea what I am doing wrong?

I use the 4.0.0-SNAPSHOT docker image: openHAB 4.0.0 Build #3387

Query the item via API results in the following JSON document:

{
  "link": "http://openhab/rest/items/Devolo_Magic_2_Lan_11_Thing_Status_CPU_Load",
  "state": "0.19 %",
  "stateDescription": {
    "pattern": "%d %%",
    "readOnly": false,
    "options": []
  },
  "editable": true,
  "type": "Number:Dimensionless",
  "name": "Devolo_Magic_2_Lan_11_Thing_Status_CPU_Load",
  "label": "Status CPU Load",
  "category": "",
  "tags": [
    "Point"
  ],
  "groupNames": []
}

[patrick023 (Patrick)]

Ahh I think I found a solution for my problem.

I changed my code from PercentType to QuantityType and than I get the value correctly formated in a widget:

state = QuantityType.valueOf(value+"%");

Is there some documentation which Type classes should be used in which case?

Thank you and best regards
Patrick

[mstormi (Markus Storm)]

@patrick023

I don’t want to add the ‘%’ to my log comments.

Then you should have said that and should not have given a debug log example.

@patrick023

I would like that the state of the item is displayed as ‘19 %’ in a UI widget.

There’s many ways.
The default would be to create a display pattern. That’s the pattern field in metadata of the item as documented e.g. here.

@patrick023

Is there some documentation which Type classes should be used in which case?

You should be reading the full OH documentation, it’s all there.