CheckCfgJavaValidator.java 文件源码

/**
 * Gets duplicates of a given type based on a guard (predicate). A given function is used for converting an instance of type T
 * to a string which is used for checking for duplicates.
 *
 * @param <T>
 *          the generic type
 * @param predicate
 *          the predicate acting as a guard
 * @param function
 *          returns a string for an instance of type T
 * @param elements
 *          the elements to be checked
 * @return the duplicates
 */
private <T extends EObject> Iterable<T> getDuplicates(final Predicate<T> predicate, final Function<T, String> function, final Iterable<T> elements) {
  List<T> result = Lists.newArrayList();
  Multimap<String, T> multiMap = Multimaps.newMultimap(Maps.<String, Collection<T>> newHashMap(), new Supplier<Collection<T>>() {
    @Override
    public Collection<T> get() {
      return Lists.<T> newArrayList();
    }
  });
  for (final T candidate : elements) {
    if (predicate.apply(candidate)) {
      multiMap.put(function.apply(candidate), candidate);
    }
  }
  for (String elem : multiMap.keySet()) {
    final Collection<T> duplicates = multiMap.get(elem);
    if (duplicates.size() > 1) {
      result.addAll(duplicates);
    }
  }

  return result;
}