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https://issues.apache.org/jira/browse/IO-211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12856981#action_12856981
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Jukka Zitting commented on IO-211:
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As Niall noted in IO-242, there's a corner case where the added code can throw
a NullPointerException. I fixed this in revision 934041.
> Pre- and post-processing support for proxied streams
> ----------------------------------------------------
>
> Key: IO-211
> URL: https://issues.apache.org/jira/browse/IO-211
> Project: Commons IO
> Issue Type: New Feature
> Components: Streams/Writers
> Reporter: Jukka Zitting
> Assignee: Jukka Zitting
> Priority: Minor
> Fix For: 2.0
>
> Attachments: IO-211.patch
>
>
> In many cases a stream decorator needs to add custom pre- or post-processing
> functionality to all the read and write methods in decorated input and output
> streams. For example the CountingInputStream needs to override all three
> read() methods with similar code.
> It would be nice if the proxy stream classes provided simple hooks for adding
> such functionality.
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