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Posted to issues@commons.apache.org by "Stephan Windmüller (JIRA)" <ji...@apache.org> on 2018/09/09 08:48:00 UTC

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

Stephan Windmüller created COLLECTIONS-694:
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             Summary: 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


{{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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