[jira] [Commented] (OAK-11449) Remove usage of Guava Iterables.concat()

["Rishabh Daim (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/OAK-11449?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17922949#comment-17922949 ] 

Rishabh Daim commented on OAK-11449:
------------------------------------

To concat {*}Iterables{*}, we have the following options available with us:

 
 # Using *Stream.concat() OR Stream.flatMap():* We can use native Java Code to concat multiple Iterables via Stream API [1]. Still, it would require us to return any concrete implementation of the Iterable interface such as List/Set (after using {*}collect{*}) rather than an Iterable itself. This would result in some cases changing the type of actual iterable (which could be any collections class).
 # Using *IterableUtils.chainedIterable:* Apache *commons-collections4* provides the utility to concat multiple streams via *IterableUtils.chainedIterable* [2] ** without changing the incoming iterable types. This is a replica of Guava's implementation.

 

cc [~reschke] [~baedke] 

 

[1] [https://www.baeldung.com/java-combine-multiple-collections#using-java-8-stream-api] 


[2] [https://www.baeldung.com/java-combine-multiple-collections#using-apache-commons-collections]

> Remove usage of Guava Iterables.concat()
> ----------------------------------------
>
>                 Key: OAK-11449
>                 URL: https://issues.apache.org/jira/browse/OAK-11449
>             Project: Jackrabbit Oak
>          Issue Type: Technical task
>            Reporter: Rishabh Daim
>            Assignee: Rishabh Daim
>            Priority: Major
>




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