code: @Override
      public Map<String, Object> getParameters(
              HttpServletRequest request, HttpServletResponse response) {
          final Map<String, Object> mergedParameters = new LinkedHashMap<String, Object>();
  
          for (final TransformerConfigurationSource source : this.sources) {
              final Map<String, Object> parameters = source.getParameters(request, response);
              if (parameters != null) {
                  mergedParameters.putAll(parameters);
              }
          }
  
          return mergedParameters;
      }
docs: /* (non-Javadoc)
  @see org.apereo.portal.rendering.xslt.TransformerConfigurationSource#getTransformerParameters(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)