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https://issues.apache.org/jira/browse/UIMA-2273?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13132708#comment-13132708
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Joern Kottmann commented on UIMA-2273:
--------------------------------------

If the user changed the working copy then a small dialog needs to ask the user 
what the wants to do. Either discard his changes and open the new CAS or keep 
his working copy (and overwrite the changed CAS file).

Eclipses java tools (e.g. format source file) don't even ask, they just take 
the working copy, save it and do the change, the editor even remains dirty.
                
> Let CAS Editor implement IResourceChangeListener
> ------------------------------------------------
>
>                 Key: UIMA-2273
>                 URL: https://issues.apache.org/jira/browse/UIMA-2273
>             Project: UIMA
>          Issue Type: New Feature
>          Components: CasEditor
>    Affects Versions: 2.4.0SDK
>            Reporter: Peter Klügl
>            Priority: Minor
>
> Some functionality to automatically update a opened CAS in the CAS editor if 
> the file was changed would be really nice. I don't know for sure, if this 
> functionality is missing or I simply didn't find it in the code and in 
> Eclipse. In any case, I haven't found a IResourceChangeListener 
> implementation and that is how I would have done it.
> The general communication shouldn't be a problem to implement, but - in my 
> experience - updating all necessary elements can be tricky. The interface for 
> changing a view can maybe be used and has probably to be extended.

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