private Map<String, Object> convertParameterMap( String operatorName, Map<String, String> parameterMap) throws ValidationException { HashMap<String, Object> parameters = new HashMap<String, Object>(); PropertyContainer container = ParameterDescriptorFactory.createMapBackedOperatorPropertyContainer( operatorName, parameters); // explicitly set default values for putting them into the backing map container.setDefaultValues(); // handle xml parameters Object parametersObject = metadataResourceEngine.getVelocityContext().get("parameterFile"); if (parametersObject instanceof Resource) { Resource paramatersResource = (Resource) parametersObject; if (paramatersResource.isXml()) { OperatorSpiRegistry operatorSpiRegistry = GPF.getDefaultInstance().getOperatorSpiRegistry(); OperatorSpi operatorSpi = operatorSpiRegistry.getOperatorSpi(operatorName); Class<? extends Operator> operatorClass = operatorSpi.getOperatorClass(); DefaultDomConverter domConverter = new DefaultDomConverter(operatorClass, new ParameterDescriptorFactory()); DomElement parametersElement = createDomElement(paramatersResource.getContent()); try { domConverter.convertDomToValue(parametersElement, container); } catch (ConversionException e) { String msgPattern = "Can not convert XML parameters for operator '%s'"; throw new RuntimeException(String.format(msgPattern, operatorName)); } } } for (Entry<String, String> entry : parameterMap.entrySet()) { String paramName = entry.getKey(); String paramValue = entry.getValue(); final Property property = container.getProperty(paramName); if (property != null) { property.setValueFromText(paramValue); } else { throw new RuntimeException( String.format("Parameter '%s' is not known by operator '%s'", paramName, operatorName)); } } return parameters; }