[jira] [Created] (MIME4J-299) Allow to access Header as a map

["Benoit Tellier (Jira)" <mi...@james.apache.org>]

Benoit Tellier created MIME4J-299:
-------------------------------------

             Summary: Allow to access Header as a map
                 Key: MIME4J-299
                 URL: https://issues.apache.org/jira/browse/MIME4J-299
             Project: James Mime4j
          Issue Type: New Feature
          Components: dom
    Affects Versions: 0.8.5
            Reporter: Benoit Tellier
             Fix For: 0.8.6


Today complex code is required to group headers by name:

{code:java}
    static ImmutableMap<String, String> toHeaderMap(Header header) {
        Function<Map.Entry<String, Collection<Field>>, String> bodyConcatenator = fieldListEntry -> fieldListEntry.getValue()
            .stream()
            .map(Field::getBody)
            .map(MimeUtil::unscrambleHeaderValue)
            .collect(Collectors.toList())
            .stream()
            .collect(Collectors.joining(JMAP_MULTIVALUED_FIELD_DELIMITER));

        return Multimaps.index(header.getFields(), Field::getName)
            .asMap()
            .entrySet()
            .stream()
            .collect(Guavate.toImmutableMap(Map.Entry::getKey, bodyConcatenator));
    }
{code}

Carrying over the header map can get this way simpler:

{code:java}
        static ImmutableMap<String, String> toHeaderMap(Header header) {
            return header.getFieldsAsMap()
                .entrySet()
                .stream()
                .collect(Guavate.toImmutableMap(Map.Entry::getKey,
                    entry -> entry.getValue().stream()
                        .map(Field::getBody)
                        .map(body -> DecoderUtil.decodeEncodedWords(body, DecodeMonitor.SILENT))
                        .collect(Collectors.joining(JMAP_MULTIVALUED_FIELD_DELIMITER))));
        }
{code}





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