private void rangeAxisConfigChanged(RangeAxisConfigChangeEvent rangeAxisConfigChange) {

    PlotConfiguration currentPlotConfig =
        plotInstance.getCurrentPlotConfigurationClone(); // get current plot config
    int id = rangeAxisConfigChange.getSource().getId(); // fetch id
    RangeAxisConfig currentRangeAxisConfig =
        currentPlotConfig.getRangeAxisConfigById(id); // look up range axis config

    if (currentRangeAxisConfig == null) {
      // if current range axis config is null it has been deleted afterwards in a meta change event
      debug(
          "#### CAUTION #### RANGE AXIS CONFIG CHANGE: current range axis config "
              + rangeAxisConfigChange.getSource().getLabel()
              + " with id "
              + rangeAxisConfigChange.getSource().getId()
              + " is null! Meta change event?");
      return;
    }

    // inform range axis data
    RangeAxisData rangeAxisData = getRangeAxisData(currentRangeAxisConfig);
    rangeAxisData.rangeAxisConfigChanged(rangeAxisConfigChange);

    // and also process event here
    ValueSource changeValueSource = rangeAxisConfigChange.getValueSource();
    ValueSource currentValueSource = null;
    if (changeValueSource != null) {
      id = changeValueSource.getId(); // fetch id from value source add/remove event
      currentValueSource =
          currentRangeAxisConfig.getValueSourceById(id); // look up current value source
    }
    //		else {
    //			return; // nothing to be done
    //		}

    switch (rangeAxisConfigChange.getType()) {
      case VALUE_SOURCE_ADDED:
        if (currentValueSource != null) {
          debug(
              "value source ADDED - "
                  + currentValueSource.getLabel()
                  + " ## ID: "
                  + currentValueSource.getId());
          valueSourceDataMap.put(
              currentValueSource.getId(), new ValueSourceData(currentValueSource, plotInstance));
          clearCache();
        } else {
          // if current value source is null it has been deleted afterwards in a meta change event
          debug(
              "#### CAUTION #### VALUE SOURCE ADDED: current value source"
                  + changeValueSource.getLabel()
                  + " with id "
                  + changeValueSource.getId()
                  + " is null! Meta change event?");
          return; // nothing to be done
        }
        break;
      case VALUE_SOURCE_CHANGED:
        ValueSourceChangeEvent valueSourceChange = rangeAxisConfigChange.getValueSourceChange();
        changeValueSource = valueSourceChange.getSource(); // get source
        id = changeValueSource.getId(); // fetch id from changed value source
        currentValueSource =
            currentRangeAxisConfig.getValueSourceById(id); // look up current value source

        if (currentValueSource != null) {
          debug("value source CHANGED - " + currentValueSource.getLabel() + " ## ID: " + id);
          getValueSourceData(currentValueSource)
              .valueSourceChanged(valueSourceChange, currentValueSource);
        } else {
          // if current value source is null it has been deleted afterwards in a meta change event
          debug(
              "#### CAUTION #### VALUE SOURCE CHANGED: current value source"
                  + changeValueSource.getLabel()
                  + " with id "
                  + changeValueSource.getId()
                  + " is null! Meta change event?");
          return; // nothing to be done
        }
        break;
      case VALUE_SOURCE_REMOVED:
        debug(
            "value source REMOVED - "
                + changeValueSource.getLabel()
                + " ## ID: "
                + changeValueSource.getId());
        valueSourceDataMap.remove(changeValueSource.getId());
        clearCache();
        break;
    }
  }
  @Override
  public synchronized boolean plotConfigurationChanged(PlotConfigurationChangeEvent change) {
    if (change == null || change == lastProcessedEvent) {
      return true;
    }
    lastProcessedEvent = change;

    PlotConfiguration currentPlotConfig =
        plotInstance.getCurrentPlotConfigurationClone(); // get current plot config

    // prepare temp variables
    int id = -1;
    DimensionConfig currentDimensionConfig = null;
    RangeAxisConfig currentRangeAxis = null;

    DimensionConfig changeDimensionConfig = change.getDimensionConfig();
    if (changeDimensionConfig != null) {
      // if event is a dimension config add/remove event, get current dimension config
      // (may be null if meta event is processed and it has been deleted afterwards)
      id = changeDimensionConfig.getId();
      currentDimensionConfig = currentPlotConfig.getDefaultDimensionConfigById(id);
    }

    RangeAxisConfig changeRangeAxis = change.getRangeAxisConfig();
    if (changeRangeAxis != null) {
      // if event is a range axis config add/remove event, get current range axis config
      // (may be null if meta event is processed and it has been deleted afterwards)
      id = changeRangeAxis.getId();
      currentRangeAxis = currentPlotConfig.getRangeAxisConfigById(id);
    }

    switch (change.getType()) {
      case TRIGGER_REPLOT:
        clearCache();
        break;
      case AXES_FONT:
        break;
      case AXIS_LINE_COLOR:
        break;
      case AXIS_LINE_WIDTH:
        break;
      case FRAME_BACKGROUND_COLOR:
        break;
      case CHART_TITLE:
        break;
      case COLOR_SCHEME:
        break;
      case DATA_TABLE_EXCHANGED:
        break;
      case DIMENSION_CONFIG_ADDED:
        // if current plot configuration still contains item..
        if (currentDimensionConfig != null && id != -1) {
          // add new dimension config data to map
          dimensionConfigDataMap.put(
              id,
              new DimensionConfigData(
                  plotInstance, (DefaultDimensionConfig) currentDimensionConfig));
          debug(
              "ADDED dimension "
                  + currentDimensionConfig.getDimension().getName()
                  + " ## ID: "
                  + id);
          clearCache();
        } else {
          debug(
              "#### CAUTION ###### ADD DIMENSION CONFIG: CURRENT DIMENSIONCONFIG "
                  + changeDimensionConfig.getLabel()
                  + " with id "
                  + changeDimensionConfig.getId()
                  + " IS NULL! Processing meta event?");
        }
        break;
      case DIMENSION_CONFIG_CHANGED:
        dimensionConfigChanged(change.getDimensionChange());
        break;
      case DIMENSION_CONFIG_REMOVED:
        debug(
            "REMOVED dimension "
                + changeDimensionConfig.getDimension().getName()
                + " ## ID: "
                + changeDimensionConfig.getId());
        dimensionConfigDataMap.remove(
            changeDimensionConfig.getId()); // remove dimension config data from map
        clearCache();
        break;
      case LEGEND_CHANGED:
        break;
      case PLOT_BACKGROUND_COLOR:
        break;
      case PLOT_ORIENTATION:
        break;
      case RANGE_AXIS_CONFIG_ADDED:
        // if current plot configuration still contains item..
        if (currentRangeAxis != null && id != -1) {
          // add new range axis data to map
          debug("range axis ADDED - " + currentRangeAxis.getLabel() + " ## ID: " + id);
          rangeAxisDataMap.put(id, new RangeAxisData(currentRangeAxis, plotInstance));
          for (ValueSource valueSource :
              currentRangeAxis.getValueSources()) { // also add containing value sources data to map
            debug(
                "value source ADDED - "
                    + valueSource.getLabel()
                    + " ## ID: "
                    + valueSource.getId());
            valueSourceDataMap.put(
                valueSource.getId(), new ValueSourceData(valueSource, plotInstance));
          }
        } else {
          debug(
              "#### CAUTION ###### ADD RANGE AXIS CONFIG: CURRENT RANGEAXISCONFIG "
                  + changeRangeAxis.getLabel()
                  + " with id "
                  + changeRangeAxis.getId()
                  + " IS NULL! Processing meta event?");
        }
        break;
      case RANGE_AXIS_CONFIG_CHANGED:
        RangeAxisConfigChangeEvent rangeAxisConfigChange = change.getRangeAxisConfigChange();
        debug(
            "range axis CHANGED - "
                + rangeAxisConfigChange.getSource().getLabel()
                + " ## ID: "
                + rangeAxisConfigChange.getSource().getId());
        rangeAxisConfigChanged(rangeAxisConfigChange);
        break;
      case RANGE_AXIS_CONFIG_MOVED:
        break;
      case RANGE_AXIS_CONFIG_REMOVED:
        RangeAxisConfig rangeAxis = change.getRangeAxisConfig();
        debug("range axis REMOVED - " + rangeAxis.getLabel() + " ## ID: " + rangeAxis.getId());
        rangeAxisDataMap.remove(rangeAxis.getId()); // remove range axis config from map
        for (ValueSource valueSource :
            rangeAxis.getValueSources()) { // also remove all containing value sources from data map
          valueSourceDataMap.remove(valueSource.getId());
        }
        clearCache();
        break;
      case LINK_AND_BRUSH_SELECTION:
        break;
      case META_CHANGE:
        for (PlotConfigurationChangeEvent e : change.getPlotConfigChangeEvents()) {
          plotConfigurationChanged(e);
        }
        break;
    }

    return true;
  }