[jira] [Created] (CAMEL-4603) Messages after a split() should not keep attachments

["Hadrian Zbarcea (Created) (JIRA)" <ji...@apache.org>]

Messages after a split() should not keep attachments
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                 Key: CAMEL-4603
                 URL: https://issues.apache.org/jira/browse/CAMEL-4603
             Project: Camel
          Issue Type: Improvement
          Components: camel-core
    Affects Versions: 2.8.2
            Reporter: Hadrian Zbarcea
            Assignee: Hadrian Zbarcea
             Fix For: 2.9.0


Camel does not implement an Expression that returns the attachments on a Messages. There is the @Attachments annotation that uses the ExpressionBuilder.attachmentsExpression, but that returns the whole map, not just the values(). Since Map.Entry<K, V> is generic you cannot use an implicit TypeConverter to V.

In my sandbox I implemented an attachments() expression to use with the splitter, returning a Collection you can iterate through. The splitter replaces the body of the original message with the items in the Collection, leaving the attachments in place.  

I propose dropping the attachments in the split messages. It's kinda awkward imho to split a message into smaller messages but still keep the attachments. I can hardly imagine a scenario where the attachments are needed and I think it's more of an edge case. It would be good, I think to add a builder method that returns the values() on the attachments Map, not the entries. The key may be lost, but depending on the attachment, the Content-Type (for mail attachments for instance) may have a copy of the key.

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