private ContentStream getRenditionStream(String repositoryId, Content content, String streamId) {
if (!content.isDocument() && !content.isFolder()) {
exceptionService.constraint(
content.getId(),
"getRenditionStream cannnot be invoked to other than document or folder type.");
}
exceptionService.constraintRenditionStreamDownload(content, streamId);
Rendition rendition = contentService.getRendition(repositoryId, streamId);
BigInteger length = BigInteger.valueOf(rendition.getLength());
String mimeType = rendition.getMimetype();
InputStream is = rendition.getInputStream();
ContentStream cs = new ContentStreamImpl("preview_" + streamId, length, mimeType, is);
return cs;
}
