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From Marshall Schor <...@schor.com>
Subject Re: [jira] [Commented] (UIMA-2409) CasCopier.copyCasView should be able to copy into a view with a different name
Date Tue, 18 Jun 2013 14:09:13 GMT
In the following use case, what should be the result:

  1) Source and target CASs have the same base CAS (that is, they might be 2
different views).  Currently - there's no check for this, and what happens is
that the existing reachable feature structures are copied (making duplicates)
and those are indexed in the new view, and the sofa data is optionally copied. 
Because the new view has its own Sofa, any annotation (which has a reference to
the Sofa) would not be == (it would have a reference to the copied sofa). So,
the copying is probably required (at least for subtypes of AnnotationBaseFS).

I plan to keep this behavior.

  2) Target CAS has some Feature Structure Instances that are the "same" as the
Source CAS.  My suggestion - ignore this, and just add (another) instance. 
(Currently, this is what happens).  "Same-ness" is hard to define, especially if
"lenient" is in effect. 

-----
Another little change:

If a Sofa reference isn't set, the current code (for AnnotationFS and subtypes)
sets this to the Sofa.  This is so that adding this FS to the indexes doesn't
fail when it is attempted to be added to the built-in Annotation Index.  It
seems to me this should be extended to general annotations (AnnotationBaseFS and
subtypes), to cover non-text style annotations.

-----
The APIs:

Currently the API is a 2-level one, plus some Static methods to hide this.  The
2-level one:
  a) make an instance of the CAS Copier, passing in both CASes.  Also set a
lenient flag.
  b) A copyView method: arguments are some representation of the View, and a
flag which says whether or not to copy the Sofa.

There are 2 common ways to specify a view:
  a) by view name - a string
  b) by an instance of the the CAS which is that particular view

I plan to uniformly allow both styles.  So there will be:

   copyCasView(CAS aSrcCasView,                                boolean
aCopySofa)  <<< currently exists
   copyCasView(String aSrcCasViewName,                         boolean aCopySofa)

   copyCasView(CAS aSrcCasView,        CAS aTgtCasView,        boolean aCopySofa)
   copyCasView(String aSrcCasViewName, String aTgtCasViewName, boolean aCopySofa)

   copyCasView(CAS aSrcCasView,        String aTgtCasViewName, boolean aCopySofa)
   copyCasView(String aSrcCasViewName, CAS aTgtView,           boolean aCopySofa)

Let me know if there are other opinions here...

-Marshall




On 6/17/2013 2:09 PM, Joern Kottmann (JIRA) wrote:
>     [ https://issues.apache.org/jira/browse/UIMA-2409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13685786#comment-13685786
] 
>
> Joern Kottmann commented on UIMA-2409:
> --------------------------------------
>
> Yes, the patch should be reviewed before it is applied. I was not confident that it works
for all the edge cases. Can you have a look Marshall?
>                 
>> CasCopier.copyCasView should be able to copy into a view with a different name
>> ------------------------------------------------------------------------------
>>
>>                 Key: UIMA-2409
>>                 URL: https://issues.apache.org/jira/browse/UIMA-2409
>>             Project: UIMA
>>          Issue Type: Improvement
>>          Components: Core Java Framework
>>            Reporter: Joern Kottmann
>>            Priority: Trivial
>>             Fix For: 2.4.1SDK
>>
>>         Attachments: UIMA-2409.patch
>>
>>
>> The CasCopier should be able to copy a CAS view into a new CAS and giving this new
CAS view a different name.
>> A common use case is to copy a view of multi view CAS into a new single view CAS.
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