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From "Jukka Zitting (JIRA)" <j...@apache.org>
Subject [jira] Updated: (IO-192) Tagged input and output streams
Date Thu, 05 Feb 2009 10:08:00 GMT

     [ https://issues.apache.org/jira/browse/IO-192?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jukka Zitting updated IO-192:
-----------------------------

    Attachment: IO-192.patch

This came up on the Tika mailing list, so I'm attaching the current state of the patch I have.
It still needs tests and more javadocs, but the basic functionality should already be in place.

> Tagged input and output streams
> -------------------------------
>
>                 Key: IO-192
>                 URL: https://issues.apache.org/jira/browse/IO-192
>             Project: Commons IO
>          Issue Type: New Feature
>          Components: Streams/Writers
>            Reporter: Jukka Zitting
>            Priority: Minor
>         Attachments: IO-192.patch
>
>
> I'd like to introduce two new proxy streams, TaggedInputStream and TaggedOutputStream,
that tag all exceptions thrown by the proxied streams. The goal is to make it easier to detect
the source of an IOException when you're dealing with multiple different streams. For example:
> {code}
> InputStream input = ...;
> OutputStream output = ...;
> TaggedOutputStream proxy = new TaggedOutputStream(output);
> try {
>     IOUtils.copy(input, proxy);
> } catch (IOException e) {
>     if (proxy.isTagged(e)) {
>         // Could not write to the output stream
>         // Perhaps we can handle that error somehow (retry, cancel?)
>         e.initCause(); // gives the original exception from the proxied stream
>     } else {
>         // Could not read from the input stream, nothing we can do
>         throw e;
>     }
> }
> {code}
> I'm working on a patch to implement such a feature.

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