[CODEC-250] Wrong value calculated by Cologne Phonetic if a special character is placed between equal letters

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.5, 1.11
• Fix Version/s: 1.12
• Assignee: Unassigned
• Reporter: Alex Volodko
• Created: 22/Sep/18 13:24
• Updated: 23/Feb/19 13:00
• Resolved: 23/Feb/19 09:55

Description

The algorith for cologne phonetic is (simpilied):

1. Encode letter by letter from left to right according to the conversion table.
2. Remove all digits occurring more than once next to each other.
3. Remove all code "0" except at the beginning.

Characters which are not specified in conversion table (such as hyphens) are ignored. See https://en.wikipedia.org/wiki/Cologne_phonetics

If the input is "test-test" the step results will be:

1. 20822082
2. 2082082
3. 28282

The expected result for "test-test" is therefor 28282.

The actual result for "test-test" is 282282.

This bug is caused by the fix from

https://github.com/apache/commons-codec/commit/72c8759a22c6552a2dfcdf61b29729f981752879

and is present since 1.5

Issue Links

• links to: GitHub Pull Request #14
• links to: GitHub Pull Request #14