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From "Sebb (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LANG-935) Possible performance improvement on string escape functions
Date Mon, 16 Mar 2015 01:16:38 GMT

    [ https://issues.apache.org/jira/browse/LANG-935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14362647#comment-14362647
] 

Sebb commented on LANG-935:
---------------------------

Why is the "prefixMap" field a HashMap?
Surely it should be a HashSet, as the value is not used.
If there is a good reason why using a HashMap with a dummy value is better than using a HashSet,
then this should be documented in the code

> Possible performance improvement on string escape functions
> -----------------------------------------------------------
>
>                 Key: LANG-935
>                 URL: https://issues.apache.org/jira/browse/LANG-935
>             Project: Commons Lang
>          Issue Type: Improvement
>          Components: lang.text.translate.*
>    Affects Versions: 3.1
>            Reporter: Peter Wall
>            Priority: Minor
>              Labels: performance
>             Fix For: Patch Needed
>
>         Attachments: LANG-935.patch, tempproject1.zip
>
>
> The escape functions for HTML etc. use the same code and the same initialisation tables
for the escape and unescape functions, and while this is an elegant approach it leads to a
number of deficiencies:
> 1. The code is very much less efficient than it could be
> 2. A new output string is created even when no conversion is required
> 3. No mapping is provided for characters that do not have a specific representation (for
example HTML 0x101 should become &amp;#257; )
> The proposal is to use a new mapping technique to address these issues



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