@Override
  public NetTracerRow[] getRootRows() {
    if (model == null) return new NetTracerVSourceRow[] {};

    if (rows == null || modelDirty) {

      ArrayList<VoltageSource> ports =
          new ArrayList<VoltageSource>(PMFindVDomainTools.findVoltageSources(pmConfig));
      ports.addAll(PMFindVDomainTools.findPowerSourcePins(pmConfig));

      ArrayList<NetTracerRow> rows = new ArrayList<NetTracerRow>();

      for (VoltageSource port : ports) {
        // TODO
        //			if ( !((PowerSourceDB)port).isDerived() ) {
        //				// search the source pin inside the power network
        //				srcPin = DBNodeTools.getPortDBNode(model, true, port.getPinName());
        //
        rows.add(new NetTracerVSourceRow(this, null, port));
        //			}
      }
      this.rows = rows.toArray(new NetTracerRow[rows.size()]);
    }

    return this.rows;
  }
  public WritableList getObservedVsrcWritable() {
    if (observedVsrcWritable == null) {
      observedVsrcWritable = new WritableList(observedVsrc, VoltageSource.class);
      initPinListListener();

      observedVsrcWritable.addAll(PMFindVDomainTools.findAllVoltageSources(pmConfig));
    }

    return observedVsrcWritable;
  }
  public Object execute(List<String> argList) throws TclShellException {
    JSAPResult argv = parse(argList);
    if (argv == null) {
      return false;
    }

    if (argv.getBoolean(SmOptionPM.LIST_ATTR_OPTION)) {
      for (PWR_SRC_ATTR e : PWR_SRC_ATTR.values())
        System.out.println(
            " =>  "
                + e.arg
                + " :\n         "
                + e.help
                + (e.allowed == null ? "" : " = " + StringUtilities.join(", ", e.allowed) + ")"));

      return true;
    }

    String modelID = argv.getString(SmOption.MODEL_OPTION);
    ModelDB model =
        (modelID != null) ? ToolsDesign.getModel(modelID) : UnwCore.getDBProject().model();

    if (model == null) {
      Logger.error(ErrorList.DB3.errorName(), ErrorList.DB3.getMessage(modelID));
      throw new TclShellException("");
    }

    PMConfig cfg = PMResourceManager.instance.getPmconfig(model, null);

    String pwrsrcName = argv.getString(SmOptionPM.PWRSRC_OPTION);

    PowerSourceInstance powerSource = PMFindVDomainTools.findPowerSource(cfg, pwrsrcName);

    if (powerSource == null) {
      Logger.error(
          ErrorListPM.PM22.errorName(),
          ErrorListPM.PM22.getMessage(pwrsrcName + "in model " + model.getModelName()));
      throw new TclShellException("");
    }

    if (!argv.contains(SmOption.NAME_VALUE_OPTION)) {
      Logger.error("TCL", "no attribute specified");
      throw new TclShellException("");
    }

    String[] tokens = argv.getStringArray(SmOption.NAME_VALUE_OPTION);
    if (tokens.length % 2 != 0) {
      Logger.error(ErrorListPM.PM_TCL1.errorName(), ErrorListPM.PM_TCL1.getMessage());
      throw new TclShellException("");
    }

    String attrName;
    String attrValue;
    boolean error = false;

    for (int i = 0; i < tokens.length; i += 2) {
      attrName = tokens[i];
      attrValue = tokens[i + 1];

      PWR_SRC_ATTR id = PWR_SRC_ATTR.findAttr(attrName);

      if (id == null) {
        Logger.error(ErrorListPM.PM_TCL3.errorName(), ErrorListPM.PM_TCL3.getMessage(attrName));
        throw new TclShellException("");

      } else {

        CONNECT_DIRECTIVE direct = null;

        switch (id) {
          case CONNECT_IVOLT:
            try {
              direct = CONNECT_DIRECTIVE.valueOf(attrValue);
              powerSource.setConnectInputVoltage(direct);
            } catch (Exception e) {
              error = true;
            }
            break;

          case CONNECT_CTRL:
            try {
              direct = CONNECT_DIRECTIVE.valueOf(attrValue);
              powerSource.setConnectControl(direct);
            } catch (Exception e) {
              error = true;
            }
            break;

          case NAME:
            if (FormatValidation.isAlphaNumeric(attrValue, false)) {
              powerSource.setName(attrValue);
            } else error = true;

          default:
            break;
        }

        if (error) {
          Logger.error(
              ErrorListPM.PM_TCL2.errorName(),
              ErrorListPM.PM_TCL2.getMessage(attrValue + " for attribute " + attrName));
          throw new TclShellException("");
        }
      }
    }

    return true;
  }