code: public void unSimplify()
      {
          if (sourceNode == null)
          {
              sourceNode = new MDAGNode(false);
              equivalenceClassMDAGNodeHashMap = new HashMap<MDAGNode, MDAGNode>();
              MDAGNode[] toNodeArray = new MDAGNode[mdagDataArray.length];
              createMDAGNode(simplifiedSourceNode, -1, toNodeArray, new MDAGNode[mdagDataArray.length]);
              // 构建注册表
              for (MDAGNode mdagNode : toNodeArray)
              {
                  equivalenceClassMDAGNodeHashMap.put(mdagNode, mdagNode);
              }
              // 扔掉垃圾
              simplifiedSourceNode = null;
          }
      }
docs: 解压缩