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https://issues.apache.org/jira/browse/IO-582?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16559554#comment-16559554
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Sebb commented on IO-582:
-------------------------
No need; you can extend Observer with your own class and pass that to
ObservableInputStream#add(Observer)
See for example
MessageDigestCalculatingInputStream.MessageDigestMaintainingObserver
> ObservableInputStream.Observer are package-private
> --------------------------------------------------
>
> Key: IO-582
> URL: https://issues.apache.org/jira/browse/IO-582
> Project: Commons IO
> Issue Type: Bug
> Components: Streams/Writers
> Affects Versions: 2.6
> Reporter: Bruno Palos
> Priority: Minor
>
> Hi,
> According with the documentation of `ObservableInputStream` and
> `ObservableInputStream.Observer`, it should be possible to use those classes
> as part of the `commons-io` utilities. However,
> `ObservableInputStream.Observer`'s methods are package private and can't be
> extended outside the project's source code.
> My suggestion is to make `ObservableInputStream.Observer`'s methods protected.
> I'm happy to open a PR for this.
> Thank you
>
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