code: public void copyNodeMetaData(ASTNode other) {
          if (other.metaDataMap == null) {
              return;
          }
          if (metaDataMap == null) {
              metaDataMap = new ListHashMap();
          }
          metaDataMap.putAll(other.metaDataMap);
      }
docs: Copies all node meta data from the other node to this one
  @param other - the other node