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https://issues.apache.org/jira/browse/NIFI-446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14553011#comment-14553011
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Bryan Bende commented on NIFI-446:
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Cool, sorry about the unit tests, thanks for merging so quickly!

> MergeContent should provide "Strategy" property for specifying how Header, 
> Footer, and Demarcator properties should be interpreted
> ----------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: NIFI-446
>                 URL: https://issues.apache.org/jira/browse/NIFI-446
>             Project: Apache NiFi
>          Issue Type: Improvement
>          Components: Extensions
>            Reporter: Mark Payne
>            Assignee: Bryan Bende
>            Priority: Minor
>
> The Header, Footer, and Demarcator currently must be specified as filenames. 
> We should add a strategy to allow user to configure the values as filenames 
> or just text to insert.
> We would have a property named "Delimiter Strategy" (or something better) 
> that provides 2 allowable value: "Text" and "Filename".
> If filename, it should behave as it does now. If text, instead of 
> interpreting the header, footer, and demarcator as filenames, the 
> user-defined text should be used. This means we should change the "Display 
> Name" of these properties from "Header File", "Footer File", and "Demarcator 
> File" to simply "Header", "Footer", and "Demarcator", respectively.
> Also will need to implement customValidate, since the validation of these 
> properties depends on the strategy.
> Also need to allow for the Expression Language to be used, if not filename. 
> If filename, should not allow Expression Language.



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