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https://issues.apache.org/jira/browse/CSV-43?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13226862#comment-13226862
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Sebb commented on CSV-43:
-------------------------

Yes, every fluent method creates a new instance. That seems very wasteful.
                
> CSVFormat fluent API is rather inefficient
> ------------------------------------------
>
>                 Key: CSV-43
>                 URL: https://issues.apache.org/jira/browse/CSV-43
>             Project: Commons CSV
>          Issue Type: Improvement
>            Reporter: Sebb
>
> The implementation of the CSVFormat fluent API is rather inefficient, as each 
> method invocation clones the original class instance.
> Now that the fields are volatile, it would be possible to do away with the 
> clone() calls entirely.
> This would mean that the format could be updated later.
> If such usage is not desirable, then perhaps consider adding some kind of 
> "freeze" method to prevent further changes.
> Or perhaps the parse() and format() methods could perform the freeze (e.g. 
> set a flag to disable further updates).

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