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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (COLLECTIONS-694) Support for Transformer in LazyList
Date Sun, 09 Sep 2018 09:56:00 GMT

    [ https://issues.apache.org/jira/browse/COLLECTIONS-694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16608401#comment-16608401
] 

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 <windy@...>
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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