@Nonnull
private static Content processPart(MimePart part, MimePart parent)
throws MessagingException, IOException {
if (part == null) {
return new Content();
}
if (part.getFileName() != null) {
// Assume that a part which has a filename is an attachment.
return new Content(part);
}
if (part.isMimeType("text/*")) {
return getContent(part);
} else if (part.isMimeType("multipart/*")) {
if (part.isMimeType(MimeType.MULTIPART_RELATED)) {
return getContentWithAttachments(part);
} else if (part.isMimeType(MimeType.MULTIPART_ALTERNATIVE)) {
return getContentOfBestPart(part, parent);
} else {
return getJoinedContent(part);
}
}
return new Content();
}
private static Content getContentOfBestPart(MimePart part, MimePart parent)
throws IOException, MessagingException {
MimeBodyPart best = null;
MimeMultipart mp = (MimeMultipart) part.getContent();
for (int i = 0; i < mp.getCount(); i++) {
// Prefer HTML if the parent is a multipart/related part which may contain
// inline images, because text/plain cannot embed the images.
boolean isHtmlPreferred = parent != null && parent.isMimeType(MimeType.MULTIPART_RELATED);
best = better((MimeBodyPart) mp.getBodyPart(i), best, isHtmlPreferred);
}
return processPart(best, part);
}