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https://issues.apache.org/jira/browse/OAK-11449?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17922949#comment-17922949
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Rishabh Daim edited comment on OAK-11449 at 2/1/25 4:03 PM:
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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).
If we return any Iterable backed by Stream, we can only iterate it
once. This might be problematic in some cases.
# 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]
was (Author: JIRAUSER299730):
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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