code: public List<ITopicNode> getTopicNodesForKey(final String key) {
          if (topicsKeys.containsKey(key)) {
              return topicsKeys.get(key);
          }
  
          return new LinkedList<ITopicNode>();
      }
docs: Get a List of all the SpecTopics in the Database for a Topic ID.
  
  @param key The Topic Key to find SpecTopics for.
  @return A List of SpecTopic objects whose Key matches.