public PreparedAttachment prepareAttachment(Attachment att, long length, long encodedLength)
            throws AttachmentException {
        PreparedAttachment pa = AttachmentManager.prepareAttachment(attachmentsDir,
                attachmentStreamFactory, att, length, encodedLength);
        return pa;
    }
public PreparedAttachment prepareAttachment ( Attachment att , long length , long encodedLength ) throws AttachmentException { PreparedAttachment pa = AttachmentManager . prepareAttachment ( attachmentsDir , attachmentStreamFactory , att , length , encodedLength ) ; return pa ; }
<p>
Read attachment stream to a temporary location and calculate sha1,
prior to being added to the DocumentStore.
</p>
<p>
Used by replicator when receiving new/updated attachments
</p>

@param att           Attachment to be prepared, providing data either from a file or a stream
@param length        Size in bytes of attachment as signalled by "length" metadata property
@param encodedLength Size in bytes of attachment, after encoding, as signalled by
"encoded_length" metadata property
@return A prepared attachment, ready to be added to the DocumentStore
@throws AttachmentException if there was an error preparing the attachment, e.g., reading
attachment data.