Experimental Physics and
Industrial Control System

"Carcassi, Gabriele" <[email protected]> · Thu, 20 Oct 2011 11:33:20 -0400

Hi Marcus,

>Something like PV.isWriteAllowed() from org.csstudio.utility.pv would
be nice.
Right: I have been meditating to add it, but it's not as easy as it
looks.

The PV represents (in general) an expression. So, for example, you are
going to write a map that writes 5 channels in the appropriate order.
What should isWriteAllowed() return, if only one is actually readonly?

I haven't found a way for it to be well defined/obvious/intuitive for
complex expression (which is the whole point of PVManager). Could give a
map for all the channels, and whether they are write allowed. Or maybe I
should just give you a channel object, so you may get more
information... Don't have a clear idea yet...

Gabriele

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of
[email protected]
Sent: Thursday, October 20, 2011 7:49 AM
To: [email protected]
Subject: PVManager ReadOnly Check

Hi,

I have a setup of CSS, PVManager and a custom plugin. In the custom
plugin is a jface table viewer containing information based on process
variables.
Depending on whether that PV is writable I would like to offer
EditingSupport in certain cells.

Is there another way to check if a PV is writable/readonly in advance
instead of registering a PVWriterListener and catching a
WriteFailedException after trying to write to a readonly variable ?

Something like PV.isWriteAllowed() from org.csstudio.utility.pv would be
nice.

Thanks,
Marcus

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System