[jira] [Created] (NIFI-3206) Add ifElse function to Expression Language

["Matt Burgess (JIRA)" <ji...@apache.org>]

Matt Burgess created NIFI-3206:
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             Summary: Add ifElse function to Expression Language
                 Key: NIFI-3206
                 URL: https://issues.apache.org/jira/browse/NIFI-3206
             Project: Apache NiFi
          Issue Type: Improvement
            Reporter: Matt Burgess
            Assignee: Matt Burgess


Although UpdateAttribute's Advanced tab lets the user perform conditional processing (if-else, e.g.), it would be nice to allow for simple conditionals wherever Expression Language is supported.

For example, in any EL-supported property, I could specify (with an attribute "filename" for example):

${filename:isNull():ifElse('not_found', 'found')}

Then if filename is null this will evaluate to 'not_found', and if it is non-null it would evaluate to 'found'. For consistency the subject should be allowed to be anything that can be evaluated as a boolean, so if "myVal" is set to the string "true", then:

${myVal:ifElse('a', 'b')} 

should evaluate to 'a'




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