code: public synchronized boolean makeExclusiveDependency(int depStreamID, int exclusiveParentStreamID) {
  
          Node depNode = root.findNode(depStreamID);
          Node exclusiveParentNode = root.findNode(exclusiveParentStreamID);
          return makeExclusiveDependency(depNode, exclusiveParentNode);
  
      }
docs: Helper method to find the nodes given the stream IDs, and then call the method that does the real work.
  
  @param depStreamID
  @param exclusiveParentStreamID
  @return the Node that was changed, null if the node or the parent node could not be found