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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