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From "Levon Karayan (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LANG-534) ArrayUtils should have method to convert null arrays to empty ones to help with Defensive coding
Date Wed, 23 Sep 2009 05:07:15 GMT

     [ https://issues.apache.org/jira/browse/LANG-534?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Levon Karayan updated LANG-534:
-------------------------------

    Summary: ArrayUtils should have method to convert null arrays to empty ones to help with
Defensive coding  (was: ArrayUtils should have method to conver null arrays to empty ones
to help with Defensive coding)

> 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
>
>   Original Estimate: 0.17h
>  Remaining Estimate: 0.17h
>
> 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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