You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@commons.apache.org by "Sebb (JIRA)" <ji...@apache.org> on 2012/10/01 02:22:08 UTC
[jira] [Updated] (LANG-839) ArrayUtils removeElements methods use
unnecessary HashSet
[ https://issues.apache.org/jira/browse/LANG-839?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sebb updated LANG-839:
----------------------
Attachment: LANG-839.patch
Implementation of removeAll private method using BitSet, plus unit test, plus sample fix to show its use in removeElements(boolean[] array, boolean... values)
> ArrayUtils removeElements methods use unnecessary HashSet
> ---------------------------------------------------------
>
> Key: LANG-839
> URL: https://issues.apache.org/jira/browse/LANG-839
> Project: Commons Lang
> Issue Type: Improvement
> Components: lang.*
> Affects Versions: 3.1
> Reporter: Sebb
> Priority: Minor
> Attachments: LANG-839.patch
>
>
> The removeElements() methods use a HashSet to collect the indexes that need removing.
> This requires creating Integer objects for each index, and the HashSet then has to be converted into an int[] array.
> It would be more efficient to store the entries in an actual int[] array.
> The maximum size of this is the length of the values array (or the length of the input array if that is shorter).
> The array must be truncated before calling the private removeAll() method; this can be done with Arrays.copyOf(x[], length).
> However, if the arrays are very large, and most of the values do not appear in the input, this might result in using more memory than the HashSet implementation.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira