Github user bbende commented on a diff in the pull request:
https://github.com/apache/nifi/pull/843#discussion_r74689944
--- Diff:
nifi-nar-bundles/nifi-hadoop-bundle/nifi-hdfs-processors/src/main/java/org/apache/nifi/processors/hadoop/AbstractHadoopProcessor.java
---
@@ -90,20 +90,55 @@ public String toString() {
}
}
+ // validator to ensure that valid EL expressions are used in the
directory property
+ static final Validator PATH_WITH_EL_VALIDATOR = new Validator() {
--- End diff --
Definitely agree this validator is not really specific to the HDFS
processors and could be moved to the StandardValidators. Let me work on doing
that.
The one that is already there expects only a single attribute expressions
like "${hadoop.dir}" and fails validation for something like
"data/${hadoop.dir}" so that was why I had to create another one that uses
newExpressionLanguageCompiler().validateExpression(input, true) instead of
newExpressionLanguageCompiler().compile(input)
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