[jira] [Reopened] (NIFI-6145) Make groovy File functions available for FlowFile to simplify scripting

["Dmitry Lukyanov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/NIFI-6145?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dmitry Lukyanov reopened NIFI-6145:
-----------------------------------

Sorry to return to this issue so late...

I believe the return values should be not the `this` object but the one returned with closure

see any of similar methods of File object:

http://docs.groovy-lang.org/latest/html/groovy-jdk/java/io/File.html#withReader(groovy.lang.Closure)

the idea to support this kind of expressions:


{code:java}
def json = ff.withReader("UTF-8"){ new JsonSlurper.parse(it) }

{code}


> Make groovy File functions available for FlowFile to simplify scripting
> -----------------------------------------------------------------------
>
>                 Key: NIFI-6145
>                 URL: https://issues.apache.org/jira/browse/NIFI-6145
>             Project: Apache NiFi
>          Issue Type: New Feature
>            Reporter: Dmitry Lukyanov
>            Assignee: Matt Burgess
>            Priority: Minor
>             Fix For: 1.10.0
>
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> I'd like to add groovy File functions to a FlowFile class insige groovy script to make work with flowfie streams similar like we work with File in groovy.
> Object withInputStream(Closure closure)
> Create a new InputStream for this file and passes it into the closure.
>  Object 	withOutputStream(Closure closure)
> Creates a new OutputStream for this file and passes it into the closure. 
>  Object 	withReader(String charset, Closure closure)
> Create a new BufferedReader for this file using the specified charset and then passes it into the closure, ensuring the reader is closed after the closure returns. 
>  Object 	withWriter(String charset, Closure closure)
> Creates a new BufferedWriter for this file, passes it to the closure, and ensures the stream is flushed and closed after the closure returns. 
> etc...
> ----
> ready to contribute



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