Sending a state to an item, after splitting the state item

[DivineJimmi]

Hey, i hope you guys can help me. I want my radiators to turn off, whenever my window opens. My windowsensors (switches, no contacts) are all in a group.

windowsensors.items

Switch Window_RoomA (gWindows)
Switch Window_RoomB (gWindows)
Switch Window_RoomC (gWindows)

radiators.items

Number Temperature_RoomA
Number Temperature_RoomB
Number Temperature_RoomC

Number TemperatureWhenWindowOpen_RoomA
Number TemperatureWhenWindowOpen_RoomB
Number TemperatureWhenWindowOpen_RoomC

I want to do all this with only ONE rule. I would like to NOT use val or vars. (If its possible)

rule WindowRadiator
when
    Member of gWindows changed to ON
then
    ("Temperature_" + triggeringItemName.split('_').get(1)).sendCommand(("TemperatureWhenWindowOpen_" + triggeringItemName.split('_').get(1)).state as DecimalType)
end

I tried different things like. toString or “as Text” and stuff. Always getting errors like: “Could not cast TemperatureWhenWindowOpen_RoomA to void” or “.state is not a member of String” and stuff like that.

logInfo(“Trigger”, "Item is: " + triggeringItemName.split(‘_’).get(1)) always give me the correct Room (RoomA, RoomB or RoomC)

Hope someone can help me with an easy fix

[rossko57]

@DivineJimmi

I would like to NOT use val or vars.

That just makes it difficult for you to manage and debug. They do not cost you anything.

@DivineJimmi

triggeringItemName.split('_').get(1))

Okay, that is a string

@DivineJimmi

triggeringItemName.split('_').get(1)).sendCommand(

Strings do not have a .sendCommand() method.

There is a sendCommand("someItem", "someCommand") Action, you would need to give that two strings as arguments.

@DivineJimmi

("TemperatureWhenWindowOpen_" + triggeringItemName.split('_').get(1))

That’s a string as well.

@DivineJimmi

("TemperatureWhenWindowOpen_" + triggeringItemName.split('_').get(1)).state

Strings do not have a .state method.

Not so easy to work around this time, you need the technique to get hold of an Item object from its itemname string

[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…

[Udo_Hartmann]

In addition to rossko57: There is no implicit var named triggeringItemName in rules that are triggered by Member of.
To be honest, it’s a bit difficult:

triggeringItem → the actual Item which triggered the Member of
triggeringItemName → the name of the item which triggered the rule when using Item as trigger (as a String Object).
As all of your window contacts are already in a group, please consider to also put the other two types of items in additional groups:

rule "Window Radiator"
when
    Member of gWindows changed to ON
then
    gTemperatures.members.filter[i|i.name.endsWith(triggeringItem.name.split("_").get(1))].
        heaad.sendCommand(gTemperatureWhenWindowOpen.members.filter[j|j.name.endsWith(triggeringItem.name.split("_").get(1))].head.state as DecimalType)
end

or way more readable (with val)

rule "Window Radiator"
when
    Member of gWindows changed to ON
then
    val strRoom = triggeringItem.name.split("_").get(1)
    val myTemperatureItem = gTemperatures.members.filter[i|i.name.endsWith(strRoom)].head
    val myOldTemperature = gTemperatureWhenWindowOpen.members.filter[j|j.name.endsWith(strRoom)].head.state.toString
    myTemperatureItem.sendCommand(myOldTemperature)
end