public InputStream getAttachment(String docId, String attachmentName, String revId) {
        final URI uri = new DatabaseURIHelper(dbUri).attachmentUri(docId, revId, attachmentName);
        return getAttachment(uri);
    }
public InputStream getAttachment ( String docId , String attachmentName , String revId ) { final URI uri = new DatabaseURIHelper ( dbUri ) . attachmentUri ( docId , revId , attachmentName ) ; return getAttachment ( uri ) ; }
Reads an attachment from the database.

The stream must be closed after usage, otherwise http connection leaks will occur.

@param docId the document id
@param attachmentName the attachment name
@param revId the document revision id or {@code null}
@return the attachment in the form of an {@code InputStream}.