[jira] Created: (MIME4J-116) Avoid duplicate parsing of header fields

["Markus Wiederkehr (JIRA)" <mi...@james.apache.org>]

Avoid duplicate parsing of header fields
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                 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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