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From "Ralph Goers (JIRA)" <j...@apache.org>
Subject [jira] Created: (LOG4J2-19) Provide looser coupling of PatternConverters
Date Sun, 22 Jun 2008 23:05:45 GMT
Provide looser coupling of PatternConverters

                 Key: LOG4J2-19
                 URL: https://issues.apache.org/jira/browse/LOG4J2-19
             Project: Log4j 2
          Issue Type: Improvement
          Components: Layouts
            Reporter: Ralph Goers

Currently, PatternLayout calls PatternParser which knows about the various PatternConverters,
many of which are imbedded in it. This makes it difficult for users to add their own Converters.

In the logging framework I created each converter identified the conversion characters it
supported. Each PatternConverter was required to supply a getKeys() method that returned this
list. The equivalent of the PatternLayout contained an array of PatternConverters. During
initialization each of these would be called and the list of keys recorded along with the
associated converter. To add your own converter all that was necessary was to extend the class
and add your new keys to the list of recorded keys along with their converters. The base PatternLayout
would then take care of calling the correct converters as necessary.

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