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question asked: Jun 13 '18, 6:09 a.m.
question was seen: 986 times
last updated: Jun 15 '18, 1:39 a.m.

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Understanding after state and before State of Changeset

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vinitha dsouza (147●23●136) | asked Jun 13 '18, 6:09 a.m.

Hello Team,

We are actually developing a tool which can sync our Source code from RTC to our Legacy Tool. As part of this we have below questions, please answer,
- Question 1: In API, we see Change.after state and before state. What exactly is this?
- Question 2: We have Change-set which is Merge type- after state and before state both returned Null. In what cases this will happen.
- Question 3: What is ICHANGE.NONE, in what cases we get this?
  

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Luca Martinucci (1.0k●3●97●112) | answered Jun 13 '18, 7:03 a.m.

I can answer about question 1.

before and after methods return an IVersionableHandle object: it is, basically, a version of a file under source control in RTC.
So, when you use before, you retrieve the the file as it was before the change; when you use after, you retrieve the file as it is after the change.
I suggest that you execute:
Integer changeKind = change.kind();
in order to get the kind of the change, i.e. whether the file has been added (changeKind=1), deleted (changeKind=16) or modified (changeKind=2) by the change.
When it has been added, you should only retrieve the after version; when it has been deleted, you should only retrieve the before version, when it has been modified, you can retrieve both before and after versions, according to your needs.

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