[jira] [Commented] (COLLECTIONS-694) Support for Transformer in LazyList

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/COLLECTIONS-694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16608402#comment-16608402 ] 

ASF GitHub Bot commented on COLLECTIONS-694:
--------------------------------------------

GitHub user stovocor opened a pull request:

    https://github.com/apache/commons-collections/pull/52

    [COLLECTIONS-694] Support Transformer for LazyList

    This change adds support for `Transformer` in the `LazyList` class.
    
    Some test cases have been added since I could not find any tests for `LazyList`. However, the class does not seem to be serializable as stated in the Javadoc.

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/stovocor/commons-collections COLLECTIONS-694

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/commons-collections/pull/52.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #52
    
----
commit 757a4519d17fadb30f8e9e4f93530ef3cce509c3
Author: Stephan Windmüller <wi...@...>
Date:   2018-09-09T09:52:06Z

    [COLLECTIONS-694] Support Transformer for LazyList

----


> Support for Transformer in LazyList
> -----------------------------------
>
>                 Key: COLLECTIONS-694
>                 URL: https://issues.apache.org/jira/browse/COLLECTIONS-694
>             Project: Commons Collections
>          Issue Type: Improvement
>          Components: List
>    Affects Versions: 4.2
>            Reporter: Stephan Windmüller
>            Priority: Minor
>
> {{LazyList}} supports a {{Factory}} for creating new elements on first access. Since a {{Factory}} does not take any arguments, those elements can not depend on any input values.
> A possible use case is a list of objects from a database, fetched by their id. If an element at a specific position is requested, it is retrieved from the database lazily. This would require support of a {{Transformer}} (from id to database object).



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