Concat Strings and create itemName out of it

[NCO (E. Gerland)]

All,

I have a string (“W_OWM_Temp”) and an int number (look0) and would like to create the item name out of them:
var tempS0 = "W_OWM_Temp" + look0.toString as GenericItem

Goal is to post an Update of this very item into another item like this:
W_OWM_TempDay0.postUpdate(tempS0.state)

but I already fail at as GenericItem:

Cannot cast from String to GenericItem

Any help would be greatly appreciated.

[vzorglub (Vincent Regaud)]

This might help:

[Rules DSL] Get item from string name!

For a couple years now, I’ve been wanting/looking for a way to construct an item from its name as a string. There are other ways to do this, and the most popular requires the item to be in a group, which can have it’s challenges. I’ll keep this short and SWEET… I finally figured it out, and it is extremely simple! For OH 2.x, you’ll need this import… import org.eclipse.smarthome.model.script.ScriptServiceUtil For OH 3.x, this import instead… import org.openhab.core.model.script.ScriptService…

[NCO (E. Gerland)]

I found that (I am checking for available threads of course)
That’s where I got the “as GenericItem” from.
But obviously I did not find the right syntax yet…

[vzorglub (Vincent Regaud)]

import org.eclipse.smarthome.model.script.ScriptServiceUtil
...

rule "something"
...
var tempS0 = "W_OWM_Temp" + look0.toString
val testItem = ScriptServiceUtil.getItemRegistry.getItem(tempS0)
W_OWM_TempDay0.postUpdate(testItem.state)
...

[NCO (E. Gerland)]

Thanks - I will give it a try.

[rlkoshak (Rich Koshak)]

This is essentially what Design Pattern: Associated Items is about.