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https://issues.apache.org/jira/browse/NIFI-446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14549633#comment-14549633
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Mark Payne commented on NIFI-446:
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[~bbende] I think I would just always allow Expression Language. If it's
interpreted as a filename, the Expression Language will be interpreted without
the FlowFile attributes, though. Still would allow you to specify JVM and
System Properties. I.e., you'd call
context.getProperty(...).evaluateAttributeExpressions().getValue();
If the "Text" strategy is used, it would interpret the value for each FlowFile
instead.
Does that make sense? It does in my head, but I'm not sure that I'm
articulating it well at all right now :)
> 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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