Java 类org.kohsuke.args4j.ClassParser 实例源码

@SuppressWarnings("unchecked")
private void parseAdditionalOptions(ClassParser classParser, Object bean, Set<Class<?>> visited) {
  // The top-level bean was already parsed by the superclass constructor,
  // so an empty visited set means we're parsing the top-level bean.
  if (!visited.isEmpty()) {
    classParser.parse(bean, this); // 'Parse' the class of the bean looking for annotations.
  }
  Class<?> beanClass = bean.getClass();
  if (visited.contains(beanClass)) {
    throw new IllegalAnnotationError(beanClass.getCanonicalName() + " used more than once.");
  } else {
    visited.add(beanClass);
  }

  for (Field f : beanClass.getDeclaredFields()) {
    if (f.isAnnotationPresent(AdditionalOptions.class)) {
      try {
        // TODO(user): nicer to do this lazily in parseArgument()
        Object fieldValue = f.getType().newInstance();
        Setters.create(f, bean).addValue(fieldValue);
        parseAdditionalOptions(classParser, fieldValue, visited);
      } catch (Exception e) {
        throw Throwables.propagate(e);
      }
    }
  }
}

@SuppressWarnings("unchecked")
private void parseAdditionalOptions(ClassParser classParser, Object bean, Set<Class<?>> visited) {
  // The top-level bean was already parsed by the superclass constructor,
  // so an empty visited set means we're parsing the top-level bean.
  if (!visited.isEmpty()) {
    classParser.parse(bean, this); // 'Parse' the class of the bean looking for annotations.
  }
  Class<?> beanClass = bean.getClass();
  if (visited.contains(beanClass)) {
    throw new IllegalAnnotationError(beanClass.getCanonicalName() + " used more than once.");
  } else {
    visited.add(beanClass);
  }

  for (Field f : beanClass.getDeclaredFields()) {
    if (f.isAnnotationPresent(AdditionalOptions.class)) {
      try {
        // TODO(vlada): nicer to do this lazily in parseArgument()
        Object fieldValue = f.getType().newInstance();
        Setters.create(f, bean).addValue(fieldValue);
        parseAdditionalOptions(classParser, fieldValue, visited);
      } catch (CmdLineException | IllegalAccessException | InstantiationException e) {
        throw new RuntimeException(e);
      }
    }
  }
}

/**
 * Creates a new command line owner that parses arguments/options and set them into
 * the given object.
 *
 * @param bean
 *      instance of a class annotated by {@link Option}, {@link Argument}
 *      and {@link AdditionalOptions}.
 *      This object will receive values. If this is null, the processing will
 *      be skipped, which is useful if you'd like to feed metadata from other sources.
 *
 * @throws IllegalAnnotationError
 *      if the option bean class is using args4j annotations incorrectly.
 * @see CmdLineParser#CmdLineParser(Object)
 */
public CmdLineParserAdditionalOptions(Object bean) {
  super(bean);
  if (bean != null) {
    Set<Class<?>> visited = Sets.newHashSet();
    parseAdditionalOptions(new ClassParser(), bean, visited);
  }
}

/**
 * Creates a new command line owner that parses arguments/options and set them into the given
 * object.
 *
 * @param bean instance of a class annotated by {@link Option}, {@link Argument} and {@link
 *     AdditionalOptions}. This object will receive values. If this is null, the processing will
 *     be skipped, which is useful if you'd like to feed metadata from other sources.
 * @throws IllegalAnnotationError if the option bean class is using args4j annotations
 *     incorrectly.
 * @see CmdLineParser#CmdLineParser(Object)
 */
public AdditionalOptionsCmdLineParser(Object bean) {
  super(bean);
  Set<Class<?>> visited = new HashSet<>();
  parseAdditionalOptions(new ClassParser(), bean, visited);
}