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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