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How to access getAcceptedDataTypes for a channel [message #1719072]

Mon, 04 January 2016 22:55

Marcel Verpaalen

Messages: 59
Registered: September 2014

Member

I'm trying to update dynamic created channels.
when I receive data and send it to the channel it needs to be casted to the right state data type for the specific channel.

When accessing the channel I do have access to the itemtype, with the getAcceptedItemType function, however, I don't see how I can properly go from there to the list of getAcceptedDataTypes
(e.g. a dimmer itemtype It's status could be 0%, 10%, 50%, 100%, but also OFF or ON and maybe UNDEFINED. So the accepted data types would be in this case PercentType, OnOffType and UnDefType)

As the Channnel.getLinkedItems() is depreciated I can't go from there to the getAcceptedDataTypes anymore.

any hint?

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Re: How to access getAcceptedDataTypes for a channel [message #1719233 is a reply to message #1719072]

Wed, 06 January 2016 11:48

John Cocula

Messages: 21
Registered: June 2015

Junior Member

I'm pretty sure there must have been a reason to make getAcceptedDataTypes and getAcceptedCommandTypes instance methods and not static methods, but I agree it can be inconvenient. One option is to instantiate a newInstance of the class returned from getAcceptedItemType and call its getAcceptedDataTypes method. Not ideal, but should work. Another option that worked in OH1 was to copy the lists of accepted data and command types when parsing binding config strings and save the copied lists in the binding config objects for use when posting updates, but I'm not sure this approach can be applied in an OH2 binding.

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Re: How to access getAcceptedDataTypes for a channel [message #1719980 is a reply to message #1719233]

Wed, 13 January 2016 14:31

Kai Kreuzer

Messages: 673
Registered: December 2011

Senior Member

Yes, what John suggests might work, but it is indeed an ugly workaround.

Afair, the reason that the getAcceptedDataTypes method is not static was a technical one: You cannot define static methods on an interface (Item).
We might e.g. add a helper method to the BaseThingHandler: Something like getAcceptedDataTypes(String channelId) - internally, this could do the trick that John described.

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Re: How to access getAcceptedDataTypes for a channel [message #1731531 is a reply to message #1719980]

Fri, 06 May 2016 14:35

Ben Suffolk

Messages: 2
Registered: April 2016

Junior Member

I find myself in a similar situation right now. I Have a string that I need to convert into a state. I have the channel and from the getAcceptedItemType() method on the channel I can get a string which tells me what type the channel is, e.g. "Number" or "Switch" etc, but I can't see how to convert y state as a String into a state that can be passed to updateState() in the thingHandler.

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Re: How to access getAcceptedDataTypes for a channel [message #1731672 is a reply to message #1731531]

Mon, 09 May 2016 07:15

Kai Kreuzer

Messages: 673
Registered: December 2011

Senior Member

> I can't see how to convert y state as a String into a state that can be passed to updateState() in the thingHandler

Since you know what types your channel supports, converting the string to a certain type should be easily possible through TypeParser.parseState().

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Re: How to access getAcceptedDataTypes for a channel [message #1731673 is a reply to message #1731672]

Mon, 09 May 2016 07:17

Kai Kreuzer

Messages: 673
Registered: December 2011

Senior Member

> We might e.g. add a helper method to the BaseThingHandler: Something like getAcceptedDataTypes(String channelId)

If this would be helpful as a convenience method, feel free to create a PR for it.

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Re: How to access getAcceptedDataTypes for a channel [message #1732606 is a reply to message #1731673]

Wed, 18 May 2016 13:20

Marcel Verpaalen

Messages: 59
Registered: September 2014

Member

It's probably my still limited understanding of the framework, but have not managed yet to get the suggested way of John to succeed.
It seems instantiating is not directly possible, and createitem can't easily be called either.

Any hints / suggestions?

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