final class MultipartAttachmentStreams
extends IncomingAttachmentStreams
The MultipartAttachmentStreams class is used to create IncomingAttachmentInputStream objects when
the HTTP stream shows a marked separation between the SOAP and each attachment parts. Unlike the
DIME version, this class will use the BoundaryDelimitedStream to parse data in the SwA format.
Another difference between the two is that the MultipartAttachmentStreams class must also provide
a way to hold attachment parts parsed prior to where the SOAP part appears in the HTTP stream
(i.e. the root part of the multipart-related message). Our DIME counterpart didn't have to worry
about this since the SOAP part is guaranteed to be the first in the stream. But since SwA has no
such guarantee, we must fall back to caching these first parts. Afterwards, we can stream the
rest of the attachments that are after the SOAP part of the request message.