code: public Post postReblog(String blogName, Long postId, String reblogKey, Map<String, ?> options) {
          if (options == null) {
              options = new HashMap<String, String>();
          }
          Map<String, Object> soptions = JumblrClient.safeOptionMap(options);
          soptions.put("id", postId.toString());
          soptions.put("reblog_key", reblogKey);
          final Long reblogId = requestBuilder.post(JumblrClient.blogPath(blogName, "/post/reblog"), soptions).getId();
          return this.blogPost(blogName, reblogId);
      }
docs: Reblog a given post
  @param blogName the name of the blog to post to
  @param postId the id of the post
  @param reblogKey the reblog_key of the post
  @param options Additional options (or null)
  @return The created reblog Post or null