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https://issues.apache.org/jira/browse/MIME4J-116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13053736#comment-13053736
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Oleg Kalnichevski commented on MIME4J-116:
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Cool! I can take of BodyDescriptor refactoring if you do not have time for that.
Oleg
> Avoid duplicate parsing of header fields
> ----------------------------------------
>
> Key: MIME4J-116
> URL: https://issues.apache.org/jira/browse/MIME4J-116
> Project: JAMES Mime4j
> Issue Type: Improvement
> Affects Versions: 0.6
> Reporter: Markus Wiederkehr
> Fix For: 0.7
>
>
> Currently some header fields are parsed twice when building a DOM. Once by
> DefaultBodyDescriptor or MaximalBodyDescriptor and a second time by
> MessageBuilder using Field.parse().
> Also different parsers are used in both stages. The body descriptors use
> handcrafted parsers whereas Field.parse uses JavaCC generated parsers. The
> handcrafted version does not seem to handle comments in a header correctly.
> The situation should be improved by parsing a header field only once and
> passing that already parsed field to a content handler. Also only one sort of
> field parser should be used; either handcrafted or generated. My personal
> opinion is that it might be easier for a handcrafted parser to be more
> tolerant against malformed header fields.
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