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https://issues.apache.org/jira/browse/LANG-534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12759289#action_12759289
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Levon Karayan commented on LANG-534:
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Thanks for all the comments everybody, and good catch Matt.
It seems like there is no reasonable generic implementation, and the submitted
patch is as good as it gets given current java & constants in ArrayUtils.
Matt, would you be the one commiting this, or are there more steps/evaluations
that this would need to go through?
> ArrayUtils should have method to convert null arrays to empty ones to help
> with Defensive coding
> ------------------------------------------------------------------------------------------------
>
> Key: LANG-534
> URL: https://issues.apache.org/jira/browse/LANG-534
> Project: Commons Lang
> Issue Type: Improvement
> Reporter: Levon Karayan
> Priority: Trivial
> Attachments: 20090920LevonArrayUtils-nullToEmpty.patch
>
>
> There are APIs that I've come across that return <code>null</code> Arrays in
> the event where there are no results. Often these APIs correctly throw
> exceptions when there is an "exceptional event", but no results isn't
> exceptional, and it often shouldn't be. This causes the programmer to make
> extra tests for null throughout the code to deal with the null case, and
> sometimes these null cases are added after a customer searched for gobleygook
> and got a NullPointerException. It's just far cleaner/safer to convert these
> null arrays to empty arrays.
> Another benefit to this method is that if the array being passed in is
> actually already an empty array, it will swap the pointer for the
> <code>static final</code> in the ArrayUtils class to help decrease memory
> fragmentation.
> e.g.
> BEFORE:
> try
> {
> results = customer.getResults(query);
> } catch ( IOException ioex ) {
> // ...
> }
> if ( null == results )
> {
> results = new int[0]{};
> }
> // do stuff
> AFTER
> try
> {
> results = ArrayUtils.nullToEmpty(customer.getResults(query));
> } catch ( IOException ioex ) {
> // ...
> }
> // do stuff
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