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https://issues.apache.org/jira/browse/IO-143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12549003
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Sebb commented on IO-143:
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For example, see CanReadFileFilter, FileDeleteStrategy etc.
These also have protected constructors, but perhaps private is better here.
> [PATCH] Added Singleton Constants in several stream classes
> -----------------------------------------------------------
>
> Key: IO-143
> URL: https://issues.apache.org/jira/browse/IO-143
> Project: Commons IO
> Issue Type: Improvement
> Components: Streams/Writers
> Affects Versions: 1.4, AFTER-1.4
> Environment: jvm compliant os
> Reporter: Nikunj Trivedi
> Fix For: 1.4, AFTER-1.4
>
> Attachments: closed_input_stream.patch, closed_output_stream.patch,
> null_output_stream.patch, null_writer.patch
>
>
> I have added singleton constants in following four classes which should have
> been singleton.
> ClosedInputStream
> ClosedOutputStream
> NullOutputStream
> NullWriter
> We may also make it a singleton by keeping constructor private, if required.
> Please comment/commit.
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