code: @Override
    public boolean visit(final Constructor<?> node) {
      this.graphStr
          .append("  \"")
          .append(node.getClass())
          .append('_')
          .append(node.getNode().getName())
          .append("\" [label=\"")
          .append(node.getNode().getName())
          .append("\", shape=box];\n");
      return true;
    }
docs: Process current injection plan node of Constructor type.
  
  @param node Current injection plan node.
  @return true to proceed with the next node, false to cancel.