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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