public static void initialize()

in uimafit-core/src/main/java/org/apache/uima/fit/component/initialize/ConfigurationParameterInitializer.java [96:191]
63 lines of code
15 McCabe index (conditional complexity)

  public static void initialize(final Object component, final UimaContext context)
          throws ResourceInitializationException {
    MutablePropertyValues values = new MutablePropertyValues();
    List<String> mandatoryValues = new ArrayList<>();

    for (Field field : getFields(component)) { // component.getClass().getDeclaredFields())
      if (isConfigurationParameterField(field)) {
        org.apache.uima.fit.descriptor.ConfigurationParameter annotation = getAnnotation(field,
                org.apache.uima.fit.descriptor.ConfigurationParameter.class);

        Object parameterValue;
        String parameterName = getConfigurationParameterName(field);

        // Obtain either from the context - or - if the context does not provide the
        // parameter, check if there is a default value. Note there are three possibilities:
        // 1) Parameter present and set
        // 2) Parameter present and set to null (null value)
        // 3) Parameter not present (also provided as null value by UIMA)
        // Unfortunately we cannot make a difference between case 2 and 3 since UIMA does
        // not allow us to actually get a list of the parameters set in the context. We can
        // only get a list of the declared parameters. Thus we have to rely on the null
        // value.
        parameterValue = context.getConfigParameterValue(parameterName);
        if (parameterValue == null) {
          parameterValue = getDefaultValue(field);
        }

        if (parameterValue != null) {
          values.addPropertyValue(field.getName(), parameterValue);
        }

        // TODO does this check really belong here? It seems that
        // this check is already performed by UIMA
        if (annotation.mandatory()) {
          mandatoryValues.add(field.getName());
        }
      }
    }

    DataBinder binder = new DataBinder(component) {
      @Override
      protected void checkRequiredFields(MutablePropertyValues mpvs) {
        String[] requiredFields = getRequiredFields();
        if (!isEmpty(requiredFields)) {
          Map<String, PropertyValue> propertyValues = new HashMap<>();
          PropertyValue[] pvs = mpvs.getPropertyValues();
          for (PropertyValue pv : pvs) {
            propertyValues.put(canonicalPropertyName(pv.getName()), pv);
          }
          for (String field : requiredFields) {
            PropertyValue pv = propertyValues.get(field);
            boolean empty = (pv == null || pv.getValue() == null);
            // For our purposes, empty Strings or empty String arrays do not count as
            // empty. Empty is only "null".
            // if (!empty) {
            // if (pv.getValue() instanceof String) {
            // empty = !StringUtils.hasText((String) pv.getValue());
            // }
            // else if (pv.getValue() instanceof String[]) {
            // String[] values = (String[]) pv.getValue();
            // empty = (values.length == 0 || !StringUtils.hasText(values[0]));
            // }
            // }
            if (empty) {
              // Use bind error processor to create FieldError.
              getBindingErrorProcessor().processMissingFieldError(field,
                      getInternalBindingResult());
              // Remove property from property values to bind:
              // It has already caused a field error with a rejected value.
              if (pv != null) {
                mpvs.removePropertyValue(pv);
                propertyValues.remove(field);
              }
            }
          }
        }
      }
    };
    binder.initDirectFieldAccess();
    registerUimaFITEditors(binder);
    binder.setRequiredFields(mandatoryValues.toArray(new String[mandatoryValues.size()]));

    binder.bind(values);

    if (binder.getBindingResult().hasErrors()) {
      StringBuilder sb = new StringBuilder();
      sb.append("Errors initializing [" + component.getClass() + "]");
      for (ObjectError error : binder.getBindingResult().getAllErrors()) {
        if (sb.length() > 0) {
          sb.append("\n");
        }
        sb.append(error.getDefaultMessage());
      }
      throw new IllegalArgumentException(sb.toString());
    }
  }