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From "Bruno P. Kinoshita (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (TEXT-19) Add alphabet converter
Date Sun, 02 Oct 2016 07:29:20 GMT

     [ https://issues.apache.org/jira/browse/TEXT-19?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Bruno P. Kinoshita resolved TEXT-19.
------------------------------------
    Resolution: Fixed

Pull request #5 to apache/commons-text merged after discussion/review. Thanks to Eyal Allweil.

> Add alphabet converter
> ----------------------
>
>                 Key: TEXT-19
>                 URL: https://issues.apache.org/jira/browse/TEXT-19
>             Project: Commons Text
>          Issue Type: New Feature
>            Reporter: Eyal Allweil
>            Assignee: Bruno P. Kinoshita
>             Fix For: 1.0
>
>
> (as described in [the mailing list|http://mail-archives.apache.org/mod_mbox/commons-dev/201609.mbox/%3c289983494.3057706.1472720010277@mail.yahoo.com%3e])
> This is a utility class I wrote for converting from one alphabet to another - for example,
from unicode to latin, without using some of the chars in latin. The usage looks like this:
> {code}
> Set<Character> originals; // a, b, c, d
> Set<Character> encoding; // 0, 1, d
> Set<Character> doNotEncode; // d
> AlphabetConverter ac = AlphabetConverter.createConverter(originals, encoding, doNotEncode);
> ac.encode("a"); // 00
> ac.encode("b"); // 01
> ac.encode("c"); // 0d
> ac.encode("d"); // d
> ac.encode("abcd"); // 00010dd
> {code}
> Of course, x.equals(ac.decode(ac.encode(x))) should always be true.
> The implementation provided makes the encodings of fixed length, other than the "do not
encode" chars, which remain as they are (length one).
> In addition, in order to make it easier to preserve the encoding scheme, I've added a
human-readable toString implementation, and a constructor that can recreate an AlphabetConverter
from the encoding map, such that:
> {code}
> AlphabetConverter ac;
> ac.equals(AlphabetConverter.createConverterFromMap(ac.getOriginalToEncoded())); // always
should be true
> {code}



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